Bump to v4.14.1.

README.md

@@ -1,4 +1,4 @@
-# lodash v4.13.0
+# lodash v4.14.1
 
 The [Lodash](https://lodash.com/) library exported as [Node.js](https://nodejs.org/) modules.
 
@@ -28,7 +28,7 @@ var chunk = require('lodash/chunk');
 var extend = require('lodash/fp/extend');
 ```
 
-See the [package source](https://github.com/lodash/lodash/tree/4.13.0-npm) for more details.
+See the [package source](https://github.com/lodash/lodash/tree/4.14.1-npm) for more details.
 
 **Note:**<br>
 Don’t assign values to the [special variable](http://nodejs.org/api/repl.html#repl_repl_features) `_` in the Node.js < 6 REPL.<br>
@@ -36,5 +36,5 @@ Install [n_](https://www.npmjs.com/package/n_) for a REPL that includes `lodash`
 
 ## Support
 
-Tested in Chrome 49-50, Firefox 45-46, IE 9-11, Edge 13, Safari 8-9, Node.js 0.10-6, & PhantomJS 1.9.8.<br>
+Tested in Chrome 50-51, Firefox 46-47, IE 9-11, Edge 13, Safari 8-9, Node.js 0.10-6, & PhantomJS 1.9.8.<br>
 Automated [browser](https://saucelabs.com/u/lodash) & [CI](https://travis-ci.org/lodash/lodash/) test runs are available.

_addMapEntry.js

@@ -7,7 +7,7 @@
  * @returns {Object} Returns `map`.
  */
 function addMapEntry(map, pair) {
-  // Don't return `Map#set` because it doesn't return the map instance in IE 11.
+  // Don't return `map.set` because it's not chainable in IE 11.
   map.set(pair[0], pair[1]);
   return map;
 }

_addSetEntry.js

@@ -7,6 +7,7 @@
  * @returns {Object} Returns `set`.
  */
 function addSetEntry(set, value) {
+  // Don't return `set.add` because it's not chainable in IE 11.
   set.add(value);
   return set;
 }

_apply.js

@@ -9,8 +9,7 @@
  * @returns {*} Returns the result of `func`.
  */
 function apply(func, thisArg, args) {
-  var length = args.length;
-  switch (length) {
+  switch (args.length) {
     case 0: return func.call(thisArg);
     case 1: return func.call(thisArg, args[0]);
     case 2: return func.call(thisArg, args[0], args[1]);

_baseClamp.js

@@ -1,5 +1,5 @@
 /**
- * The base implementation of `_.clamp` which doesn't coerce arguments to numbers.
+ * The base implementation of `_.clamp` which doesn't coerce arguments.
  *
  * @private
  * @param {number} number The number to clamp.

_baseClone.js

@@ -125,12 +125,12 @@ function baseClone(value, isDeep, isFull, customizer, key, object, stack) {
   if (!isArr) {
     var props = isFull ? getAllKeys(value) : keys(value);
   }
-  // Recursively populate clone (susceptible to call stack limits).
   arrayEach(props || value, function(subValue, key) {
     if (props) {
       key = subValue;
       subValue = value[key];
     }
+    // Recursively populate clone (susceptible to call stack limits).
     assignValue(result, key, baseClone(subValue, isDeep, isFull, customizer, key, value, stack));
   });
   return result;

_baseConforms.js

@@ -1,4 +1,5 @@
-var keys = require('./keys');
+var baseConformsTo = require('./_baseConformsTo'),
+    keys = require('./keys');
 
 /**
  * The base implementation of `_.conforms` which doesn't clone `source`.
@@ -8,25 +9,9 @@ var keys = require('./keys');
  * @returns {Function} Returns the new spec function.
  */
 function baseConforms(source) {
-  var props = keys(source),
-      length = props.length;
-
+  var props = keys(source);
   return function(object) {
-    if (object == null) {
-      return !length;
-    }
-    var index = length;
-    while (index--) {
-      var key = props[index],
-          predicate = source[key],
-          value = object[key];
-
-      if ((value === undefined &&
-          !(key in Object(object))) || !predicate(value)) {
-        return false;
-      }
-    }
-    return true;
+    return baseConformsTo(object, source, props);
   };
 }
 

_baseConformsTo.js

@@ -0,0 +1,28 @@
+/**
+ * The base implementation of `_.conformsTo` which accepts `props` to check.
+ *
+ * @private
+ * @param {Object} object The object to inspect.
+ * @param {Object} source The object of property predicates to conform to.
+ * @returns {boolean} Returns `true` if `object` conforms, else `false`.
+ */
+function baseConformsTo(object, source, props) {
+  var length = props.length;
+  if (object == null) {
+    return !length;
+  }
+  var index = length;
+  while (index--) {
+    var key = props[index],
+        predicate = source[key],
+        value = object[key];
+
+    if ((value === undefined &&
+        !(key in Object(object))) || !predicate(value)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+module.exports = baseConformsTo;

_baseDelay.js

@@ -2,13 +2,13 @@
 var FUNC_ERROR_TEXT = 'Expected a function';
 
 /**
- * The base implementation of `_.delay` and `_.defer` which accepts an array
- * of `func` arguments.
+ * The base implementation of `_.delay` and `_.defer` which accepts `args`
+ * to provide to `func`.
  *
  * @private
  * @param {Function} func The function to delay.
  * @param {number} wait The number of milliseconds to delay invocation.
- * @param {Object} args The arguments to provide to `func`.
+ * @param {Array} args The arguments to provide to `func`.
  * @returns {number} Returns the timer id.
  */
 function baseDelay(func, wait, args) {

_baseGetTag.js

@@ -0,0 +1,22 @@
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/**
+ * Used to resolve the
+ * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+ * of values.
+ */
+var objectToString = objectProto.toString;
+
+/**
+ * The base implementation of `getTag`.
+ *
+ * @private
+ * @param {*} value The value to query.
+ * @returns {string} Returns the `toStringTag`.
+ */
+function baseGetTag(value) {
+  return objectToString.call(value);
+}
+
+module.exports = baseGetTag;

_baseGt.js

@@ -1,5 +1,5 @@
 /**
- * The base implementation of `_.gt` which doesn't coerce arguments to numbers.
+ * The base implementation of `_.gt` which doesn't coerce arguments.
  *
  * @private
  * @param {*} value The value to compare.

_baseInRange.js

@@ -3,7 +3,7 @@ var nativeMax = Math.max,
     nativeMin = Math.min;
 
 /**
- * The base implementation of `_.inRange` which doesn't coerce arguments to numbers.
+ * The base implementation of `_.inRange` which doesn't coerce arguments.
  *
  * @private
  * @param {number} number The number to check.

_baseIndexOf.js

@@ -1,4 +1,5 @@
-var indexOfNaN = require('./_indexOfNaN');
+var baseFindIndex = require('./_baseFindIndex'),
+    baseIsNaN = require('./_baseIsNaN');
 
 /**
  * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
@@ -11,7 +12,7 @@ var indexOfNaN = require('./_indexOfNaN');
  */
 function baseIndexOf(array, value, fromIndex) {
   if (value !== value) {
-    return indexOfNaN(array, fromIndex);
+    return baseFindIndex(array, baseIsNaN, fromIndex);
   }
   var index = fromIndex - 1,
       length = array.length;

_baseIsArrayBuffer.js

@@ -0,0 +1,26 @@
+var isObjectLike = require('./isObjectLike');
+
+var arrayBufferTag = '[object ArrayBuffer]';
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/**
+ * Used to resolve the
+ * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+ * of values.
+ */
+var objectToString = objectProto.toString;
+
+/**
+ * The base implementation of `_.isArrayBuffer` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
+ */
+function baseIsArrayBuffer(value) {
+  return isObjectLike(value) && objectToString.call(value) == arrayBufferTag;
+}
+
+module.exports = baseIsArrayBuffer;

_baseIsDate.js

@@ -0,0 +1,27 @@
+var isObjectLike = require('./isObjectLike');
+
+/** `Object#toString` result references. */
+var dateTag = '[object Date]';
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/**
+ * Used to resolve the
+ * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+ * of values.
+ */
+var objectToString = objectProto.toString;
+
+/**
+ * The base implementation of `_.isDate` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
+ */
+function baseIsDate(value) {
+  return isObjectLike(value) && objectToString.call(value) == dateTag;
+}
+
+module.exports = baseIsDate;

_baseIsMap.js

@@ -0,0 +1,18 @@
+var getTag = require('./_getTag'),
+    isObjectLike = require('./isObjectLike');
+
+/** `Object#toString` result references. */
+var mapTag = '[object Map]';
+
+/**
+ * The base implementation of `_.isMap` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a map, else `false`.
+ */
+function baseIsMap(value) {
+  return isObjectLike(value) && getTag(value) == mapTag;
+}
+
+module.exports = baseIsMap;

_baseIsNaN.js

@@ -0,0 +1,12 @@
+/**
+ * The base implementation of `_.isNaN` without support for number objects.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
+ */
+function baseIsNaN(value) {
+  return value !== value;
+}
+
+module.exports = baseIsNaN;

_baseIsRegExp.js

@@ -0,0 +1,27 @@
+var isObject = require('./isObject');
+
+/** `Object#toString` result references. */
+var regexpTag = '[object RegExp]';
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/**
+ * Used to resolve the
+ * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+ * of values.
+ */
+var objectToString = objectProto.toString;
+
+/**
+ * The base implementation of `_.isRegExp` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
+ */
+function baseIsRegExp(value) {
+  return isObject(value) && objectToString.call(value) == regexpTag;
+}
+
+module.exports = baseIsRegExp;

_baseIsSet.js

@@ -0,0 +1,18 @@
+var getTag = require('./_getTag'),
+    isObjectLike = require('./isObjectLike');
+
+/** `Object#toString` result references. */
+var setTag = '[object Set]';
+
+/**
+ * The base implementation of `_.isSet` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a set, else `false`.
+ */
+function baseIsSet(value) {
+  return isObjectLike(value) && getTag(value) == setTag;
+}
+
+module.exports = baseIsSet;

_baseIsTypedArray.js

@@ -0,0 +1,69 @@
+var isLength = require('./isLength'),
+    isObjectLike = require('./isObjectLike');
+
+/** `Object#toString` result references. */
+var argsTag = '[object Arguments]',
+    arrayTag = '[object Array]',
+    boolTag = '[object Boolean]',
+    dateTag = '[object Date]',
+    errorTag = '[object Error]',
+    funcTag = '[object Function]',
+    mapTag = '[object Map]',
+    numberTag = '[object Number]',
+    objectTag = '[object Object]',
+    regexpTag = '[object RegExp]',
+    setTag = '[object Set]',
+    stringTag = '[object String]',
+    weakMapTag = '[object WeakMap]';
+
+var arrayBufferTag = '[object ArrayBuffer]',
+    dataViewTag = '[object DataView]',
+    float32Tag = '[object Float32Array]',
+    float64Tag = '[object Float64Array]',
+    int8Tag = '[object Int8Array]',
+    int16Tag = '[object Int16Array]',
+    int32Tag = '[object Int32Array]',
+    uint8Tag = '[object Uint8Array]',
+    uint8ClampedTag = '[object Uint8ClampedArray]',
+    uint16Tag = '[object Uint16Array]',
+    uint32Tag = '[object Uint32Array]';
+
+/** Used to identify `toStringTag` values of typed arrays. */
+var typedArrayTags = {};
+typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
+typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
+typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
+typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
+typedArrayTags[uint32Tag] = true;
+typedArrayTags[argsTag] = typedArrayTags[arrayTag] =
+typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
+typedArrayTags[dataViewTag] = typedArrayTags[dateTag] =
+typedArrayTags[errorTag] = typedArrayTags[funcTag] =
+typedArrayTags[mapTag] = typedArrayTags[numberTag] =
+typedArrayTags[objectTag] = typedArrayTags[regexpTag] =
+typedArrayTags[setTag] = typedArrayTags[stringTag] =
+typedArrayTags[weakMapTag] = false;
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/**
+ * Used to resolve the
+ * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+ * of values.
+ */
+var objectToString = objectProto.toString;
+
+/**
+ * The base implementation of `_.isTypedArray` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
+ */
+function baseIsTypedArray(value) {
+  return isObjectLike(value) &&
+    isLength(value.length) && !!typedArrayTags[objectToString.call(value)];
+}
+
+module.exports = baseIsTypedArray;

_baseKeys.js

@@ -1,3 +1,5 @@
+var overArg = require('./_overArg');
+
 /* Built-in method references for those with the same name as other `lodash` methods. */
 var nativeKeys = Object.keys;
 
@@ -9,8 +11,6 @@ var nativeKeys = Object.keys;
  * @param {Object} object The object to query.
  * @returns {Array} Returns the array of property names.
  */
-function baseKeys(object) {
-  return nativeKeys(Object(object));
-}
+var baseKeys = overArg(nativeKeys, Object);
 
 module.exports = baseKeys;

_baseLt.js

@@ -1,5 +1,5 @@
 /**
- * The base implementation of `_.lt` which doesn't coerce arguments to numbers.
+ * The base implementation of `_.lt` which doesn't coerce arguments.
  *
  * @private
  * @param {*} value The value to compare.

_baseMergeDeep.js

@@ -70,13 +70,12 @@ function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, sta
       isCommon = false;
     }
   }
-  stack.set(srcValue, newValue);
-
   if (isCommon) {
     // Recursively merge objects and arrays (susceptible to call stack limits).
+    stack.set(srcValue, newValue);
     mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
+    stack['delete'](srcValue);
   }
-  stack['delete'](srcValue);
   assignMergeValue(object, key, newValue);
 }
 

_baseNth.js

@@ -1,7 +1,7 @@
 var isIndex = require('./_isIndex');
 
 /**
- * The base implementation of `_.nth` which doesn't coerce `n` to an integer.
+ * The base implementation of `_.nth` which doesn't coerce arguments.
  *
  * @private
  * @param {Array} array The array to query.

_basePick.js

@@ -1,4 +1,4 @@
-var arrayReduce = require('./_arrayReduce');
+var basePickBy = require('./_basePickBy');
 
 /**
  * The base implementation of `_.pick` without support for individual
@@ -11,12 +11,9 @@ var arrayReduce = require('./_arrayReduce');
  */
 function basePick(object, props) {
   object = Object(object);
-  return arrayReduce(props, function(result, key) {
-    if (key in object) {
-      result[key] = object[key];
-    }
-    return result;
-  }, {});
+  return basePickBy(object, props, function(value, key) {
+    return key in object;
+  });
 }
 
 module.exports = basePick;

_basePickBy.js

@@ -1,16 +1,14 @@
-var getAllKeysIn = require('./_getAllKeysIn');
-
 /**
  * The base implementation of  `_.pickBy` without support for iteratee shorthands.
  *
  * @private
  * @param {Object} object The source object.
+ * @param {string[]} props The property identifiers to pick from.
  * @param {Function} predicate The function invoked per property.
  * @returns {Object} Returns the new object.
  */
-function basePickBy(object, predicate) {
+function basePickBy(object, props, predicate) {
   var index = -1,
-      props = getAllKeysIn(object),
       length = props.length,
       result = {};
 

_basePropertyOf.js

@@ -0,0 +1,14 @@
+/**
+ * The base implementation of `_.propertyOf` without support for deep paths.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Function} Returns the new accessor function.
+ */
+function basePropertyOf(object) {
+  return function(key) {
+    return object == null ? undefined : object[key];
+  };
+}
+
+module.exports = basePropertyOf;

_baseRange.js

@@ -4,7 +4,7 @@ var nativeCeil = Math.ceil,
 
 /**
  * The base implementation of `_.range` and `_.rangeRight` which doesn't
- * coerce arguments to numbers.
+ * coerce arguments.
  *
  * @private
  * @param {number} start The start of the range.

_baseRest.js

@@ -0,0 +1,35 @@
+var apply = require('./_apply');
+
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeMax = Math.max;
+
+/**
+ * The base implementation of `_.rest` which doesn't validate or coerce arguments.
+ *
+ * @private
+ * @param {Function} func The function to apply a rest parameter to.
+ * @param {number} [start=func.length-1] The start position of the rest parameter.
+ * @returns {Function} Returns the new function.
+ */
+function baseRest(func, start) {
+  start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
+  return function() {
+    var args = arguments,
+        index = -1,
+        length = nativeMax(args.length - start, 0),
+        array = Array(length);
+
+    while (++index < length) {
+      array[index] = args[start + index];
+    }
+    index = -1;
+    var otherArgs = Array(start + 1);
+    while (++index < start) {
+      otherArgs[index] = args[index];
+    }
+    otherArgs[start] = array;
+    return apply(func, this, otherArgs);
+  };
+}
+
+module.exports = baseRest;

_baseUnary.js

@@ -1,5 +1,5 @@
 /**
- * The base implementation of `_.unary` without support for storing wrapper metadata.
+ * The base implementation of `_.unary` without support for storing metadata.
  *
  * @private
  * @param {Function} func The function to cap arguments for.

_checkGlobal.js

@@ -1,12 +0,0 @@
-/**
- * Checks if `value` is a global object.
- *
- * @private
- * @param {*} value The value to check.
- * @returns {null|Object} Returns `value` if it's a global object, else `null`.
- */
-function checkGlobal(value) {
-  return (value && value.Object === Object) ? value : null;
-}
-
-module.exports = checkGlobal;

_copyObject.js

@@ -21,9 +21,9 @@ function copyObject(source, props, object, customizer) {
 
     var newValue = customizer
       ? customizer(object[key], source[key], key, object, source)
-      : source[key];
+      : undefined;
 
-    assignValue(object, key, newValue);
+    assignValue(object, key, newValue === undefined ? source[key] : newValue);
   }
   return object;
 }

_createAggregator.js

@@ -16,7 +16,7 @@ function createAggregator(setter, initializer) {
     var func = isArray(collection) ? arrayAggregator : baseAggregator,
         accumulator = initializer ? initializer() : {};
 
-    return func(collection, setter, baseIteratee(iteratee), accumulator);
+    return func(collection, setter, baseIteratee(iteratee, 2), accumulator);
   };
 }
 

_createAssigner.js

@@ -1,5 +1,5 @@
-var isIterateeCall = require('./_isIterateeCall'),
-    rest = require('./rest');
+var baseRest = require('./_baseRest'),
+    isIterateeCall = require('./_isIterateeCall');
 
 /**
  * Creates a function like `_.assign`.
@@ -9,7 +9,7 @@ var isIterateeCall = require('./_isIterateeCall'),
  * @returns {Function} Returns the new assigner function.
  */
 function createAssigner(assigner) {
-  return rest(function(object, sources) {
+  return baseRest(function(object, sources) {
     var index = -1,
         length = sources.length,
         customizer = length > 1 ? sources[length - 1] : undefined,

_createBind.js

@@ -1,7 +1,7 @@
-var createCtorWrapper = require('./_createCtorWrapper'),
+var createCtor = require('./_createCtor'),
     root = require('./_root');
 
-/** Used to compose bitmasks for wrapper metadata. */
+/** Used to compose bitmasks for function metadata. */
 var BIND_FLAG = 1;
 
 /**
@@ -10,14 +10,13 @@ var BIND_FLAG = 1;
  *
  * @private
  * @param {Function} func The function to wrap.
- * @param {number} bitmask The bitmask of wrapper flags. See `createWrapper`
- *  for more details.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
  * @param {*} [thisArg] The `this` binding of `func`.
  * @returns {Function} Returns the new wrapped function.
  */
-function createBaseWrapper(func, bitmask, thisArg) {
+function createBind(func, bitmask, thisArg) {
   var isBind = bitmask & BIND_FLAG,
-      Ctor = createCtorWrapper(func);
+      Ctor = createCtor(func);
 
   function wrapper() {
     var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
@@ -26,4 +25,4 @@ function createBaseWrapper(func, bitmask, thisArg) {
   return wrapper;
 }
 
-module.exports = createBaseWrapper;
+module.exports = createBind;

_createCtor.js

@@ -9,7 +9,7 @@ var baseCreate = require('./_baseCreate'),
  * @param {Function} Ctor The constructor to wrap.
  * @returns {Function} Returns the new wrapped function.
  */
-function createCtorWrapper(Ctor) {
+function createCtor(Ctor) {
   return function() {
     // Use a `switch` statement to work with class constructors. See
     // http://ecma-international.org/ecma-262/6.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist
@@ -34,4 +34,4 @@ function createCtorWrapper(Ctor) {
   };
 }
 
-module.exports = createCtorWrapper;
+module.exports = createCtor;

_createCurry.js

@@ -1,7 +1,7 @@
 var apply = require('./_apply'),
-    createCtorWrapper = require('./_createCtorWrapper'),
-    createHybridWrapper = require('./_createHybridWrapper'),
-    createRecurryWrapper = require('./_createRecurryWrapper'),
+    createCtor = require('./_createCtor'),
+    createHybrid = require('./_createHybrid'),
+    createRecurry = require('./_createRecurry'),
     getHolder = require('./_getHolder'),
     replaceHolders = require('./_replaceHolders'),
     root = require('./_root');
@@ -11,13 +11,12 @@ var apply = require('./_apply'),
  *
  * @private
  * @param {Function} func The function to wrap.
- * @param {number} bitmask The bitmask of wrapper flags. See `createWrapper`
- *  for more details.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
  * @param {number} arity The arity of `func`.
  * @returns {Function} Returns the new wrapped function.
  */
-function createCurryWrapper(func, bitmask, arity) {
-  var Ctor = createCtorWrapper(func);
+function createCurry(func, bitmask, arity) {
+  var Ctor = createCtor(func);
 
   function wrapper() {
     var length = arguments.length,
@@ -34,8 +33,8 @@ function createCurryWrapper(func, bitmask, arity) {
 
     length -= holders.length;
     if (length < arity) {
-      return createRecurryWrapper(
-        func, bitmask, createHybridWrapper, wrapper.placeholder, undefined,
+      return createRecurry(
+        func, bitmask, createHybrid, wrapper.placeholder, undefined,
         args, holders, undefined, undefined, arity - length);
     }
     var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
@@ -44,4 +43,4 @@ function createCurryWrapper(func, bitmask, arity) {
   return wrapper;
 }
 
-module.exports = createCurryWrapper;
+module.exports = createCurry;

_createFind.js

@@ -0,0 +1,25 @@
+var baseIteratee = require('./_baseIteratee'),
+    isArrayLike = require('./isArrayLike'),
+    keys = require('./keys');
+
+/**
+ * Creates a `_.find` or `_.findLast` function.
+ *
+ * @private
+ * @param {Function} findIndexFunc The function to find the collection index.
+ * @returns {Function} Returns the new find function.
+ */
+function createFind(findIndexFunc) {
+  return function(collection, predicate, fromIndex) {
+    var iterable = Object(collection);
+    if (!isArrayLike(collection)) {
+      var iteratee = baseIteratee(predicate, 3);
+      collection = keys(collection);
+      predicate = function(key) { return iteratee(iterable[key], key, iterable); };
+    }
+    var index = findIndexFunc(collection, predicate, fromIndex);
+    return index > -1 ? iterable[iteratee ? collection[index] : index] : undefined;
+  };
+}
+
+module.exports = createFind;

_createFlow.js

@@ -1,10 +1,10 @@
 var LodashWrapper = require('./_LodashWrapper'),
     baseFlatten = require('./_baseFlatten'),
+    baseRest = require('./_baseRest'),
     getData = require('./_getData'),
     getFuncName = require('./_getFuncName'),
     isArray = require('./isArray'),
-    isLaziable = require('./_isLaziable'),
-    rest = require('./rest');
+    isLaziable = require('./_isLaziable');
 
 /** Used as the size to enable large array optimizations. */
 var LARGE_ARRAY_SIZE = 200;
@@ -12,7 +12,7 @@ var LARGE_ARRAY_SIZE = 200;
 /** Used as the `TypeError` message for "Functions" methods. */
 var FUNC_ERROR_TEXT = 'Expected a function';
 
-/** Used to compose bitmasks for wrapper metadata. */
+/** Used to compose bitmasks for function metadata. */
 var CURRY_FLAG = 8,
     PARTIAL_FLAG = 32,
     ARY_FLAG = 128,
@@ -26,7 +26,7 @@ var CURRY_FLAG = 8,
  * @returns {Function} Returns the new flow function.
  */
 function createFlow(fromRight) {
-  return rest(function(funcs) {
+  return baseRest(function(funcs) {
     funcs = baseFlatten(funcs, 1);
 
     var length = funcs.length,

_createHybrid.js

@@ -1,14 +1,14 @@
 var composeArgs = require('./_composeArgs'),
     composeArgsRight = require('./_composeArgsRight'),
     countHolders = require('./_countHolders'),
-    createCtorWrapper = require('./_createCtorWrapper'),
-    createRecurryWrapper = require('./_createRecurryWrapper'),
+    createCtor = require('./_createCtor'),
+    createRecurry = require('./_createRecurry'),
     getHolder = require('./_getHolder'),
     reorder = require('./_reorder'),
     replaceHolders = require('./_replaceHolders'),
     root = require('./_root');
 
-/** Used to compose bitmasks for wrapper metadata. */
+/** Used to compose bitmasks for function metadata. */
 var BIND_FLAG = 1,
     BIND_KEY_FLAG = 2,
     CURRY_FLAG = 8,
@@ -22,8 +22,7 @@ var BIND_FLAG = 1,
  *
  * @private
  * @param {Function|string} func The function or method name to wrap.
- * @param {number} bitmask The bitmask of wrapper flags. See `createWrapper`
- *  for more details.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
  * @param {*} [thisArg] The `this` binding of `func`.
  * @param {Array} [partials] The arguments to prepend to those provided to
  *  the new function.
@@ -36,13 +35,13 @@ var BIND_FLAG = 1,
  * @param {number} [arity] The arity of `func`.
  * @returns {Function} Returns the new wrapped function.
  */
-function createHybridWrapper(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) {
+function createHybrid(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) {
   var isAry = bitmask & ARY_FLAG,
       isBind = bitmask & BIND_FLAG,
       isBindKey = bitmask & BIND_KEY_FLAG,
       isCurried = bitmask & (CURRY_FLAG | CURRY_RIGHT_FLAG),
       isFlip = bitmask & FLIP_FLAG,
-      Ctor = isBindKey ? undefined : createCtorWrapper(func);
+      Ctor = isBindKey ? undefined : createCtor(func);
 
   function wrapper() {
     var length = arguments.length,
@@ -65,8 +64,8 @@ function createHybridWrapper(func, bitmask, thisArg, partials, holders, partials
     length -= holdersCount;
     if (isCurried && length < arity) {
       var newHolders = replaceHolders(args, placeholder);
-      return createRecurryWrapper(
-        func, bitmask, createHybridWrapper, wrapper.placeholder, thisArg,
+      return createRecurry(
+        func, bitmask, createHybrid, wrapper.placeholder, thisArg,
         args, newHolders, argPos, ary, arity - length
       );
     }
@@ -83,11 +82,11 @@ function createHybridWrapper(func, bitmask, thisArg, partials, holders, partials
       args.length = ary;
     }
     if (this && this !== root && this instanceof wrapper) {
-      fn = Ctor || createCtorWrapper(fn);
+      fn = Ctor || createCtor(fn);
     }
     return fn.apply(thisBinding, args);
   }
   return wrapper;
 }
 
-module.exports = createHybridWrapper;
+module.exports = createHybrid;

_createMathOperation.js

@@ -6,13 +6,14 @@ var baseToNumber = require('./_baseToNumber'),
  *
  * @private
  * @param {Function} operator The function to perform the operation.
+ * @param {number} [defaultValue] The value used for `undefined` arguments.
  * @returns {Function} Returns the new mathematical operation function.
  */
-function createMathOperation(operator) {
+function createMathOperation(operator, defaultValue) {
   return function(value, other) {
     var result;
     if (value === undefined && other === undefined) {
-      return 0;
+      return defaultValue;
     }
     if (value !== undefined) {
       result = value;

_createOver.js

@@ -2,10 +2,9 @@ var apply = require('./_apply'),
     arrayMap = require('./_arrayMap'),
     baseFlatten = require('./_baseFlatten'),
     baseIteratee = require('./_baseIteratee'),
+    baseRest = require('./_baseRest'),
     baseUnary = require('./_baseUnary'),
-    isArray = require('./isArray'),
-    isFlattenableIteratee = require('./_isFlattenableIteratee'),
-    rest = require('./rest');
+    isArray = require('./isArray');
 
 /**
  * Creates a function like `_.over`.
@@ -15,12 +14,12 @@ var apply = require('./_apply'),
  * @returns {Function} Returns the new over function.
  */
 function createOver(arrayFunc) {
-  return rest(function(iteratees) {
+  return baseRest(function(iteratees) {
     iteratees = (iteratees.length == 1 && isArray(iteratees[0]))
       ? arrayMap(iteratees[0], baseUnary(baseIteratee))
-      : arrayMap(baseFlatten(iteratees, 1, isFlattenableIteratee), baseUnary(baseIteratee));
+      : arrayMap(baseFlatten(iteratees, 1), baseUnary(baseIteratee));
 
-    return rest(function(args) {
+    return baseRest(function(args) {
       var thisArg = this;
       return arrayFunc(iteratees, function(iteratee) {
         return apply(iteratee, thisArg, args);

_createPartial.js

@@ -1,8 +1,8 @@
 var apply = require('./_apply'),
-    createCtorWrapper = require('./_createCtorWrapper'),
+    createCtor = require('./_createCtor'),
     root = require('./_root');
 
-/** Used to compose bitmasks for wrapper metadata. */
+/** Used to compose bitmasks for function metadata. */
 var BIND_FLAG = 1;
 
 /**
@@ -11,16 +11,15 @@ var BIND_FLAG = 1;
  *
  * @private
  * @param {Function} func The function to wrap.
- * @param {number} bitmask The bitmask of wrapper flags. See `createWrapper`
- *  for more details.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
  * @param {*} thisArg The `this` binding of `func`.
  * @param {Array} partials The arguments to prepend to those provided to
  *  the new function.
  * @returns {Function} Returns the new wrapped function.
  */
-function createPartialWrapper(func, bitmask, thisArg, partials) {
+function createPartial(func, bitmask, thisArg, partials) {
   var isBind = bitmask & BIND_FLAG,
-      Ctor = createCtorWrapper(func);
+      Ctor = createCtor(func);
 
   function wrapper() {
     var argsIndex = -1,
@@ -41,4 +40,4 @@ function createPartialWrapper(func, bitmask, thisArg, partials) {
   return wrapper;
 }
 
-module.exports = createPartialWrapper;
+module.exports = createPartial;

_createRange.js

@@ -1,6 +1,6 @@
 var baseRange = require('./_baseRange'),
     isIterateeCall = require('./_isIterateeCall'),
-    toNumber = require('./toNumber');
+    toFinite = require('./toFinite');
 
 /**
  * Creates a `_.range` or `_.rangeRight` function.
@@ -15,15 +15,14 @@ function createRange(fromRight) {
       end = step = undefined;
     }
     // Ensure the sign of `-0` is preserved.
-    start = toNumber(start);
-    start = start === start ? start : 0;
+    start = toFinite(start);
     if (end === undefined) {
       end = start;
       start = 0;
     } else {
-      end = toNumber(end) || 0;
+      end = toFinite(end);
     }
-    step = step === undefined ? (start < end ? 1 : -1) : (toNumber(step) || 0);
+    step = step === undefined ? (start < end ? 1 : -1) : toFinite(step);
     return baseRange(start, end, step, fromRight);
   };
 }

_createRecurry.js

@@ -1,7 +1,8 @@
 var isLaziable = require('./_isLaziable'),
-    setData = require('./_setData');
+    setData = require('./_setData'),
+    setWrapToString = require('./_setWrapToString');
 
-/** Used to compose bitmasks for wrapper metadata. */
+/** Used to compose bitmasks for function metadata. */
 var BIND_FLAG = 1,
     BIND_KEY_FLAG = 2,
     CURRY_BOUND_FLAG = 4,
@@ -14,8 +15,7 @@ var BIND_FLAG = 1,
  *
  * @private
  * @param {Function} func The function to wrap.
- * @param {number} bitmask The bitmask of wrapper flags. See `createWrapper`
- *  for more details.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
  * @param {Function} wrapFunc The function to create the `func` wrapper.
  * @param {*} placeholder The placeholder value.
  * @param {*} [thisArg] The `this` binding of `func`.
@@ -27,7 +27,7 @@ var BIND_FLAG = 1,
  * @param {number} [arity] The arity of `func`.
  * @returns {Function} Returns the new wrapped function.
  */
-function createRecurryWrapper(func, bitmask, wrapFunc, placeholder, thisArg, partials, holders, argPos, ary, arity) {
+function createRecurry(func, bitmask, wrapFunc, placeholder, thisArg, partials, holders, argPos, ary, arity) {
   var isCurry = bitmask & CURRY_FLAG,
       newHolders = isCurry ? holders : undefined,
       newHoldersRight = isCurry ? undefined : holders,
@@ -50,7 +50,7 @@ function createRecurryWrapper(func, bitmask, wrapFunc, placeholder, thisArg, par
     setData(result, newData);
   }
   result.placeholder = placeholder;
-  return result;
+  return setWrapToString(result, func, bitmask);
 }
 
-module.exports = createRecurryWrapper;
+module.exports = createRecurry;

_createSet.js

@@ -6,7 +6,7 @@ var Set = require('./_Set'),
 var INFINITY = 1 / 0;
 
 /**
- * Creates a set of `values`.
+ * Creates a set object of `values`.
  *
  * @private
  * @param {Array} values The values to add to the set.

_createWrap.js

@@ -1,17 +1,18 @@
 var baseSetData = require('./_baseSetData'),
-    createBaseWrapper = require('./_createBaseWrapper'),
-    createCurryWrapper = require('./_createCurryWrapper'),
-    createHybridWrapper = require('./_createHybridWrapper'),
-    createPartialWrapper = require('./_createPartialWrapper'),
+    createBind = require('./_createBind'),
+    createCurry = require('./_createCurry'),
+    createHybrid = require('./_createHybrid'),
+    createPartial = require('./_createPartial'),
     getData = require('./_getData'),
     mergeData = require('./_mergeData'),
     setData = require('./_setData'),
+    setWrapToString = require('./_setWrapToString'),
     toInteger = require('./toInteger');
 
 /** Used as the `TypeError` message for "Functions" methods. */
 var FUNC_ERROR_TEXT = 'Expected a function';
 
-/** Used to compose bitmasks for wrapper metadata. */
+/** Used to compose bitmasks for function metadata. */
 var BIND_FLAG = 1,
     BIND_KEY_FLAG = 2,
     CURRY_FLAG = 8,
@@ -28,7 +29,7 @@ var nativeMax = Math.max;
  *
  * @private
  * @param {Function|string} func The function or method name to wrap.
- * @param {number} bitmask The bitmask of wrapper flags.
+ * @param {number} bitmask The bitmask flags.
  *  The bitmask may be composed of the following flags:
  *     1 - `_.bind`
  *     2 - `_.bindKey`
@@ -48,7 +49,7 @@ var nativeMax = Math.max;
  * @param {number} [arity] The arity of `func`.
  * @returns {Function} Returns the new wrapped function.
  */
-function createWrapper(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {
+function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {
   var isBindKey = bitmask & BIND_KEY_FLAG;
   if (!isBindKey && typeof func != 'function') {
     throw new TypeError(FUNC_ERROR_TEXT);
@@ -91,16 +92,16 @@ function createWrapper(func, bitmask, thisArg, partials, holders, argPos, ary, a
     bitmask &= ~(CURRY_FLAG | CURRY_RIGHT_FLAG);
   }
   if (!bitmask || bitmask == BIND_FLAG) {
-    var result = createBaseWrapper(func, bitmask, thisArg);
+    var result = createBind(func, bitmask, thisArg);
   } else if (bitmask == CURRY_FLAG || bitmask == CURRY_RIGHT_FLAG) {
-    result = createCurryWrapper(func, bitmask, arity);
+    result = createCurry(func, bitmask, arity);
   } else if ((bitmask == PARTIAL_FLAG || bitmask == (BIND_FLAG | PARTIAL_FLAG)) && !holders.length) {
-    result = createPartialWrapper(func, bitmask, thisArg, partials);
+    result = createPartial(func, bitmask, thisArg, partials);
   } else {
-    result = createHybridWrapper.apply(undefined, newData);
+    result = createHybrid.apply(undefined, newData);
   }
   var setter = data ? baseSetData : setData;
-  return setter(result, newData);
+  return setWrapToString(setter(result, newData), func, bitmask);
 }
 
-module.exports = createWrapper;
+module.exports = createWrap;

_deburrLetter.js

@@ -1,3 +1,5 @@
+var basePropertyOf = require('./_basePropertyOf');
+
 /** Used to map latin-1 supplementary letters to basic latin letters. */
 var deburredLetters = {
   '\xc0': 'A',  '\xc1': 'A', '\xc2': 'A', '\xc3': 'A', '\xc4': 'A', '\xc5': 'A',
@@ -26,8 +28,6 @@ var deburredLetters = {
  * @param {string} letter The matched letter to deburr.
  * @returns {string} Returns the deburred letter.
  */
-function deburrLetter(letter) {
-  return deburredLetters[letter];
-}
+var deburrLetter = basePropertyOf(deburredLetters);
 
 module.exports = deburrLetter;

_defineProperty.js

@@ -0,0 +1,11 @@
+var getNative = require('./_getNative');
+
+/* Used to set `toString` methods. */
+var defineProperty = (function() {
+  var func = getNative(Object, 'defineProperty'),
+      name = getNative.name;
+
+  return (name && name.length > 2) ? func : undefined;
+}());
+
+module.exports = defineProperty;

_equalArrays.js

@@ -29,7 +29,7 @@ function equalArrays(array, other, equalFunc, customizer, bitmask, stack) {
   }
   // Assume cyclic values are equal.
   var stacked = stack.get(array);
-  if (stacked) {
+  if (stacked && stack.get(other)) {
     return stacked == other;
   }
   var index = -1,
@@ -37,6 +37,7 @@ function equalArrays(array, other, equalFunc, customizer, bitmask, stack) {
       seen = (bitmask & UNORDERED_COMPARE_FLAG) ? new SetCache : undefined;
 
   stack.set(array, other);
+  stack.set(other, array);
 
   // Ignore non-index properties.
   while (++index < arrLength) {
@@ -75,6 +76,7 @@ function equalArrays(array, other, equalFunc, customizer, bitmask, stack) {
     }
   }
   stack['delete'](array);
+  stack['delete'](other);
   return result;
 }
 

_equalByTag.js

@@ -1,5 +1,6 @@
 var Symbol = require('./_Symbol'),
     Uint8Array = require('./_Uint8Array'),
+    eq = require('./eq'),
     equalArrays = require('./_equalArrays'),
     mapToArray = require('./_mapToArray'),
     setToArray = require('./_setToArray');
@@ -63,18 +64,14 @@ function equalByTag(object, other, tag, equalFunc, customizer, bitmask, stack) {
 
     case boolTag:
     case dateTag:
-      // Coerce dates and booleans to numbers, dates to milliseconds and
-      // booleans to `1` or `0` treating invalid dates coerced to `NaN` as
-      // not equal.
-      return +object == +other;
+    case numberTag:
+      // Coerce booleans to `1` or `0` and dates to milliseconds.
+      // Invalid dates are coerced to `NaN`.
+      return eq(+object, +other);
 
     case errorTag:
       return object.name == other.name && object.message == other.message;
 
-    case numberTag:
-      // Treat `NaN` vs. `NaN` as equal.
-      return (object != +object) ? other != +other : object == +other;
-
     case regexpTag:
     case stringTag:
       // Coerce regexes to strings and treat strings, primitives and objects,
@@ -98,10 +95,12 @@ function equalByTag(object, other, tag, equalFunc, customizer, bitmask, stack) {
         return stacked == other;
       }
       bitmask |= UNORDERED_COMPARE_FLAG;
-      stack.set(object, other);
 
       // Recursively compare objects (susceptible to call stack limits).
-      return equalArrays(convert(object), convert(other), equalFunc, customizer, bitmask, stack);
+      stack.set(object, other);
+      var result = equalArrays(convert(object), convert(other), equalFunc, customizer, bitmask, stack);
+      stack['delete'](object);
+      return result;
 
     case symbolTag:
       if (symbolValueOf) {

_equalObjects.js

@@ -37,11 +37,12 @@ function equalObjects(object, other, equalFunc, customizer, bitmask, stack) {
   }
   // Assume cyclic values are equal.
   var stacked = stack.get(object);
-  if (stacked) {
+  if (stacked && stack.get(other)) {
     return stacked == other;
   }
   var result = true;
   stack.set(object, other);
+  stack.set(other, object);
 
   var skipCtor = isPartial;
   while (++index < objLength) {
@@ -77,6 +78,7 @@ function equalObjects(object, other, equalFunc, customizer, bitmask, stack) {
     }
   }
   stack['delete'](object);
+  stack['delete'](other);
   return result;
 }
 

_escapeHtmlChar.js

@@ -1,3 +1,5 @@
+var basePropertyOf = require('./_basePropertyOf');
+
 /** Used to map characters to HTML entities. */
 var htmlEscapes = {
   '&': '&',
@@ -15,8 +17,6 @@ var htmlEscapes = {
  * @param {string} chr The matched character to escape.
  * @returns {string} Returns the escaped character.
  */
-function escapeHtmlChar(chr) {
-  return htmlEscapes[chr];
-}
+var escapeHtmlChar = basePropertyOf(htmlEscapes);
 
 module.exports = escapeHtmlChar;

_freeGlobal.js

@@ -0,0 +1,4 @@
+/** Detect free variable `global` from Node.js. */
+var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;
+
+module.exports = freeGlobal;

_getPrototype.js

@@ -1,3 +1,5 @@
+var overArg = require('./_overArg');
+
 /* Built-in method references for those with the same name as other `lodash` methods. */
 var nativeGetPrototype = Object.getPrototypeOf;
 
@@ -8,8 +10,6 @@ var nativeGetPrototype = Object.getPrototypeOf;
  * @param {*} value The value to query.
  * @returns {null|Object} Returns the `[[Prototype]]`.
  */
-function getPrototype(value) {
-  return nativeGetPrototype(Object(value));
-}
+var getPrototype = overArg(nativeGetPrototype, Object);
 
 module.exports = getPrototype;

_getSymbols.js

@@ -1,7 +1,8 @@
-var stubArray = require('./stubArray');
+var overArg = require('./_overArg'),
+    stubArray = require('./stubArray');
 
-/** Built-in value references. */
-var getOwnPropertySymbols = Object.getOwnPropertySymbols;
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeGetSymbols = Object.getOwnPropertySymbols;
 
 /**
  * Creates an array of the own enumerable symbol properties of `object`.
@@ -10,15 +11,6 @@ var getOwnPropertySymbols = Object.getOwnPropertySymbols;
  * @param {Object} object The object to query.
  * @returns {Array} Returns the array of symbols.
  */
-function getSymbols(object) {
-  // Coerce `object` to an object to avoid non-object errors in V8.
-  // See https://bugs.chromium.org/p/v8/issues/detail?id=3443 for more details.
-  return getOwnPropertySymbols(Object(object));
-}
-
-// Fallback for IE < 11.
-if (!getOwnPropertySymbols) {
-  getSymbols = stubArray;
-}
+var getSymbols = nativeGetSymbols ? overArg(nativeGetSymbols, Object) : stubArray;
 
 module.exports = getSymbols;

_getSymbolsIn.js

@@ -1,9 +1,10 @@
 var arrayPush = require('./_arrayPush'),
     getPrototype = require('./_getPrototype'),
-    getSymbols = require('./_getSymbols');
+    getSymbols = require('./_getSymbols'),
+    stubArray = require('./stubArray');
 
-/** Built-in value references. */
-var getOwnPropertySymbols = Object.getOwnPropertySymbols;
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeGetSymbols = Object.getOwnPropertySymbols;
 
 /**
  * Creates an array of the own and inherited enumerable symbol properties
@@ -13,7 +14,7 @@ var getOwnPropertySymbols = Object.getOwnPropertySymbols;
  * @param {Object} object The object to query.
  * @returns {Array} Returns the array of symbols.
  */
-var getSymbolsIn = !getOwnPropertySymbols ? getSymbols : function(object) {
+var getSymbolsIn = !nativeGetSymbols ? stubArray : function(object) {
   var result = [];
   while (object) {
     arrayPush(result, getSymbols(object));

_getTag.js

@@ -3,6 +3,7 @@ var DataView = require('./_DataView'),
     Promise = require('./_Promise'),
     Set = require('./_Set'),
     WeakMap = require('./_WeakMap'),
+    baseGetTag = require('./_baseGetTag'),
     toSource = require('./_toSource');
 
 /** `Object#toString` result references. */
@@ -38,9 +39,7 @@ var dataViewCtorString = toSource(DataView),
  * @param {*} value The value to query.
  * @returns {string} Returns the `toStringTag`.
  */
-function getTag(value) {
-  return objectToString.call(value);
-}
+var getTag = baseGetTag;
 
 // Fallback for data views, maps, sets, and weak maps in IE 11,
 // for data views in Edge, and promises in Node.js.

_getWrapDetails.js

@@ -0,0 +1,17 @@
+/** Used to match wrap detail comments. */
+var reWrapDetails = /\{\n\/\* \[wrapped with (.+)\] \*/,
+    reSplitDetails = /,? & /;
+
+/**
+ * Extracts wrapper details from the `source` body comment.
+ *
+ * @private
+ * @param {string} source The source to inspect.
+ * @returns {Array} Returns the wrapper details.
+ */
+function getWrapDetails(source) {
+  var match = source.match(reWrapDetails);
+  return match ? match[1].split(reSplitDetails) : [];
+}
+
+module.exports = getWrapDetails;

_indexOfNaN.js

@@ -1,23 +0,0 @@
-/**
- * Gets the index at which the first occurrence of `NaN` is found in `array`.
- *
- * @private
- * @param {Array} array The array to search.
- * @param {number} fromIndex The index to search from.
- * @param {boolean} [fromRight] Specify iterating from right to left.
- * @returns {number} Returns the index of the matched `NaN`, else `-1`.
- */
-function indexOfNaN(array, fromIndex, fromRight) {
-  var length = array.length,
-      index = fromIndex + (fromRight ? 1 : -1);
-
-  while ((fromRight ? index-- : ++index < length)) {
-    var other = array[index];
-    if (other !== other) {
-      return index;
-    }
-  }
-  return -1;
-}
-
-module.exports = indexOfNaN;

_insertWrapDetails.js

@@ -0,0 +1,21 @@
+/** Used to match wrap detail comments. */
+var reWrapComment = /\{(?:\n\/\* \[wrapped with .+\] \*\/)?\n?/;
+
+/**
+ * Inserts wrapper `details` in a comment at the top of the `source` body.
+ *
+ * @private
+ * @param {string} source The source to modify.
+ * @returns {Array} details The details to insert.
+ * @returns {string} Returns the modified source.
+ */
+function insertWrapDetails(source, details) {
+  var length = details.length,
+      lastIndex = length - 1;
+
+  details[lastIndex] = (length > 1 ? '& ' : '') + details[lastIndex];
+  details = details.join(length > 2 ? ', ' : ' ');
+  return source.replace(reWrapComment, '{\n/* [wrapped with ' + details + '] */\n');
+}
+
+module.exports = insertWrapDetails;

_isFlattenable.js

@@ -1,6 +1,10 @@
-var isArguments = require('./isArguments'),
+var Symbol = require('./_Symbol'),
+    isArguments = require('./isArguments'),
     isArray = require('./isArray');
 
+/** Built-in value references. */
+var spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined;
+
 /**
  * Checks if `value` is a flattenable `arguments` object or array.
  *
@@ -9,7 +13,8 @@ var isArguments = require('./isArguments'),
  * @returns {boolean} Returns `true` if `value` is flattenable, else `false`.
  */
 function isFlattenable(value) {
-  return isArray(value) || isArguments(value);
+  return isArray(value) || isArguments(value) ||
+    !!(spreadableSymbol && value && value[spreadableSymbol]);
 }
 
 module.exports = isFlattenable;

_isFlattenableIteratee.js

@@ -1,16 +0,0 @@
-var isArray = require('./isArray'),
-    isFunction = require('./isFunction');
-
-/**
- * Checks if `value` is a flattenable array and not a `_.matchesProperty`
- * iteratee shorthand.
- *
- * @private
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is flattenable, else `false`.
- */
-function isFlattenableIteratee(value) {
-  return isArray(value) && !(value.length == 2 && !isFunction(value[0]));
-}
-
-module.exports = isFlattenableIteratee;

_isMaskable.js

@@ -9,6 +9,6 @@ var coreJsData = require('./_coreJsData'),
  * @param {*} value The value to check.
  * @returns {boolean} Returns `true` if `func` is maskable, else `false`.
  */
-var isMaskable = !coreJsData ? stubFalse : isFunction;
+var isMaskable = coreJsData ? isFunction : stubFalse;
 
 module.exports = isMaskable;

_mergeData.js

@@ -5,7 +5,7 @@ var composeArgs = require('./_composeArgs'),
 /** Used as the internal argument placeholder. */
 var PLACEHOLDER = '__lodash_placeholder__';
 
-/** Used to compose bitmasks for wrapper metadata. */
+/** Used to compose bitmasks for function metadata. */
 var BIND_FLAG = 1,
     BIND_KEY_FLAG = 2,
     CURRY_BOUND_FLAG = 4,

_mergeDefaults.js

@@ -16,7 +16,10 @@ var baseMerge = require('./_baseMerge'),
  */
 function mergeDefaults(objValue, srcValue, key, object, source, stack) {
   if (isObject(objValue) && isObject(srcValue)) {
-    baseMerge(objValue, srcValue, undefined, mergeDefaults, stack.set(srcValue, objValue));
+    // Recursively merge objects and arrays (susceptible to call stack limits).
+    stack.set(srcValue, objValue);
+    baseMerge(objValue, srcValue, undefined, mergeDefaults, stack);
+    stack['delete'](srcValue);
   }
   return objValue;
 }

_nodeUtil.js

@@ -0,0 +1,22 @@
+var freeGlobal = require('./_freeGlobal');
+
+/** Detect free variable `exports`. */
+var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;
+
+/** Detect free variable `module`. */
+var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;
+
+/** Detect the popular CommonJS extension `module.exports`. */
+var moduleExports = freeModule && freeModule.exports === freeExports;
+
+/** Detect free variable `process` from Node.js. */
+var freeProcess = moduleExports && freeGlobal.process;
+
+/** Used to access faster Node.js helpers. */
+var nodeUtil = (function() {
+  try {
+    return freeProcess && freeProcess.binding('util');
+  } catch (e) {}
+}());
+
+module.exports = nodeUtil;

_overArg.js

@@ -0,0 +1,15 @@
+/**
+ * Creates a function that invokes `func` with its first argument transformed.
+ *
+ * @private
+ * @param {Function} func The function to wrap.
+ * @param {Function} transform The argument transform.
+ * @returns {Function} Returns the new function.
+ */
+function overArg(func, transform) {
+  return function(arg) {
+    return func(transform(arg));
+  };
+}
+
+module.exports = overArg;

_root.js

@@ -1,15 +1,9 @@
-var checkGlobal = require('./_checkGlobal');
-
-/** Detect free variable `global` from Node.js. */
-var freeGlobal = checkGlobal(typeof global == 'object' && global);
+var freeGlobal = require('./_freeGlobal');
 
 /** Detect free variable `self`. */
-var freeSelf = checkGlobal(typeof self == 'object' && self);
-
-/** Detect `this` as the global object. */
-var thisGlobal = checkGlobal(typeof this == 'object' && this);
+var freeSelf = typeof self == 'object' && self && self.Object === Object && self;
 
 /** Used as a reference to the global object. */
-var root = freeGlobal || freeSelf || thisGlobal || Function('return this')();
+var root = freeGlobal || freeSelf || Function('return this')();
 
 module.exports = root;

_setWrapToString.js

@@ -0,0 +1,27 @@
+var constant = require('./constant'),
+    defineProperty = require('./_defineProperty'),
+    getWrapDetails = require('./_getWrapDetails'),
+    identity = require('./identity'),
+    insertWrapDetails = require('./_insertWrapDetails'),
+    updateWrapDetails = require('./_updateWrapDetails');
+
+/**
+ * Sets the `toString` method of `wrapper` to mimic the source of `reference`
+ * with wrapper details in a comment at the top of the source body.
+ *
+ * @private
+ * @param {Function} wrapper The function to modify.
+ * @param {Function} reference The reference function.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
+ * @returns {Function} Returns `wrapper`.
+ */
+var setWrapToString = !defineProperty ? identity : function(wrapper, reference, bitmask) {
+  var source = (reference + '');
+  return defineProperty(wrapper, 'toString', {
+    'configurable': true,
+    'enumerable': false,
+    'value': constant(insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)))
+  });
+};
+
+module.exports = setWrapToString;

_stackSet.js

@@ -1,4 +1,5 @@
 var ListCache = require('./_ListCache'),
+    Map = require('./_Map'),
     MapCache = require('./_MapCache');
 
 /** Used as the size to enable large array optimizations. */
@@ -16,8 +17,13 @@ var LARGE_ARRAY_SIZE = 200;
  */
 function stackSet(key, value) {
   var cache = this.__data__;
-  if (cache instanceof ListCache && cache.__data__.length == LARGE_ARRAY_SIZE) {
-    cache = this.__data__ = new MapCache(cache.__data__);
+  if (cache instanceof ListCache) {
+    var pairs = cache.__data__;
+    if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) {
+      pairs.push([key, value]);
+      return this;
+    }
+    cache = this.__data__ = new MapCache(pairs);
   }
   cache.set(key, value);
   return this;

_stringToPath.js

@@ -2,7 +2,8 @@ var memoize = require('./memoize'),
     toString = require('./toString');
 
 /** Used to match property names within property paths. */
-var rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(\.|\[\])(?:\4|$))/g;
+var reLeadingDot = /^\./,
+    rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|$))/g;
 
 /** Used to match backslashes in property paths. */
 var reEscapeChar = /\\(\\)?/g;
@@ -15,8 +16,13 @@ var reEscapeChar = /\\(\\)?/g;
  * @returns {Array} Returns the property path array.
  */
 var stringToPath = memoize(function(string) {
+  string = toString(string);
+
   var result = [];
-  toString(string).replace(rePropName, function(match, number, quote, string) {
+  if (reLeadingDot.test(string)) {
+    result.push('');
+  }
+  string.replace(rePropName, function(match, number, quote, string) {
     result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
   });
   return result;

_unescapeHtmlChar.js

@@ -1,3 +1,5 @@
+var basePropertyOf = require('./_basePropertyOf');
+
 /** Used to map HTML entities to characters. */
 var htmlUnescapes = {
   '&': '&',
@@ -15,8 +17,6 @@ var htmlUnescapes = {
  * @param {string} chr The matched character to unescape.
  * @returns {string} Returns the unescaped character.
  */
-function unescapeHtmlChar(chr) {
-  return htmlUnescapes[chr];
-}
+var unescapeHtmlChar = basePropertyOf(htmlUnescapes);
 
 module.exports = unescapeHtmlChar;

_updateWrapDetails.js

@@ -0,0 +1,46 @@
+var arrayEach = require('./_arrayEach'),
+    arrayIncludes = require('./_arrayIncludes');
+
+/** Used to compose bitmasks for function metadata. */
+var BIND_FLAG = 1,
+    BIND_KEY_FLAG = 2,
+    CURRY_FLAG = 8,
+    CURRY_RIGHT_FLAG = 16,
+    PARTIAL_FLAG = 32,
+    PARTIAL_RIGHT_FLAG = 64,
+    ARY_FLAG = 128,
+    REARG_FLAG = 256,
+    FLIP_FLAG = 512;
+
+/** Used to associate wrap methods with their bit flags. */
+var wrapFlags = [
+  ['ary', ARY_FLAG],
+  ['bind', BIND_FLAG],
+  ['bindKey', BIND_KEY_FLAG],
+  ['curry', CURRY_FLAG],
+  ['curryRight', CURRY_RIGHT_FLAG],
+  ['flip', FLIP_FLAG],
+  ['partial', PARTIAL_FLAG],
+  ['partialRight', PARTIAL_RIGHT_FLAG],
+  ['rearg', REARG_FLAG]
+];
+
+/**
+ * Updates wrapper `details` based on `bitmask` flags.
+ *
+ * @private
+ * @returns {Array} details The details to modify.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
+ * @returns {Array} Returns `details`.
+ */
+function updateWrapDetails(details, bitmask) {
+  arrayEach(wrapFlags, function(pair) {
+    var value = '_.' + pair[0];
+    if ((bitmask & pair[1]) && !arrayIncludes(details, value)) {
+      details.push(value);
+    }
+  });
+  return details.sort();
+}
+
+module.exports = updateWrapDetails;

add.js

@@ -17,6 +17,6 @@ var createMathOperation = require('./_createMathOperation');
  */
 var add = createMathOperation(function(augend, addend) {
   return augend + addend;
-});
+}, 0);
 
 module.exports = add;

ary.js

@@ -1,6 +1,6 @@
-var createWrapper = require('./_createWrapper');
+var createWrap = require('./_createWrap');
 
-/** Used to compose bitmasks for wrapper metadata. */
+/** Used to compose bitmasks for function metadata. */
 var ARY_FLAG = 128;
 
 /**
@@ -23,7 +23,7 @@ var ARY_FLAG = 128;
 function ary(func, n, guard) {
   n = guard ? undefined : n;
   n = (func && n == null) ? func.length : n;
-  return createWrapper(func, ARY_FLAG, undefined, undefined, undefined, undefined, n);
+  return createWrap(func, ARY_FLAG, undefined, undefined, undefined, undefined, n);
 }
 
 module.exports = ary;

assign.js

@@ -36,18 +36,18 @@ var nonEnumShadows = !propertyIsEnumerable.call({ 'valueOf': 1 }, 'valueOf');
  * @example
  *
  * function Foo() {
- *   this.c = 3;
+ *   this.a = 1;
  * }
  *
  * function Bar() {
- *   this.e = 5;
+ *   this.c = 3;
  * }
  *
- * Foo.prototype.d = 4;
- * Bar.prototype.f = 6;
+ * Foo.prototype.b = 2;
+ * Bar.prototype.d = 4;
  *
- * _.assign({ 'a': 1 }, new Foo, new Bar);
- * // => { 'a': 1, 'c': 3, 'e': 5 }
+ * _.assign({ 'a': 0 }, new Foo, new Bar);
+ * // => { 'a': 1, 'c': 3 }
  */
 var assign = createAssigner(function(object, source) {
   if (nonEnumShadows || isPrototype(source) || isArrayLike(source)) {

assignIn.js

@@ -32,18 +32,18 @@ var nonEnumShadows = !propertyIsEnumerable.call({ 'valueOf': 1 }, 'valueOf');
  * @example
  *
  * function Foo() {
- *   this.b = 2;
+ *   this.a = 1;
  * }
  *
  * function Bar() {
- *   this.d = 4;
+ *   this.c = 3;
  * }
  *
- * Foo.prototype.c = 3;
- * Bar.prototype.e = 5;
+ * Foo.prototype.b = 2;
+ * Bar.prototype.d = 4;
  *
- * _.assignIn({ 'a': 1 }, new Foo, new Bar);
- * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5 }
+ * _.assignIn({ 'a': 0 }, new Foo, new Bar);
+ * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }
  */
 var assignIn = createAssigner(function(object, source) {
   if (nonEnumShadows || isPrototype(source) || isArrayLike(source)) {

at.js

@@ -1,6 +1,6 @@
 var baseAt = require('./_baseAt'),
     baseFlatten = require('./_baseFlatten'),
-    rest = require('./rest');
+    baseRest = require('./_baseRest');
 
 /**
  * Creates an array of values corresponding to `paths` of `object`.
@@ -19,7 +19,7 @@ var baseAt = require('./_baseAt'),
  * _.at(object, ['a[0].b.c', 'a[1]']);
  * // => [3, 4]
  */
-var at = rest(function(object, paths) {
+var at = baseRest(function(object, paths) {
   return baseAt(object, baseFlatten(paths, 1));
 });
 

attempt.js

@@ -1,6 +1,6 @@
 var apply = require('./_apply'),
-    isError = require('./isError'),
-    rest = require('./rest');
+    baseRest = require('./_baseRest'),
+    isError = require('./isError');
 
 /**
  * Attempts to invoke `func`, returning either the result or the caught error
@@ -24,7 +24,7 @@ var apply = require('./_apply'),
  *   elements = [];
  * }
  */
-var attempt = rest(function(func, args) {
+var attempt = baseRest(function(func, args) {
   try {
     return apply(func, undefined, args);
   } catch (e) {

before.js

@@ -18,7 +18,7 @@ var FUNC_ERROR_TEXT = 'Expected a function';
  * @example
  *
  * jQuery(element).on('click', _.before(5, addContactToList));
- * // => allows adding up to 4 contacts to the list
+ * // => Allows adding up to 4 contacts to the list.
  */
 function before(n, func) {
   var result;

bind.js

@@ -1,9 +1,9 @@
-var createWrapper = require('./_createWrapper'),
+var baseRest = require('./_baseRest'),
+    createWrap = require('./_createWrap'),
     getHolder = require('./_getHolder'),
-    replaceHolders = require('./_replaceHolders'),
-    rest = require('./rest');
+    replaceHolders = require('./_replaceHolders');
 
-/** Used to compose bitmasks for wrapper metadata. */
+/** Used to compose bitmasks for function metadata. */
 var BIND_FLAG = 1,
     PARTIAL_FLAG = 32;
 
@@ -27,9 +27,9 @@ var BIND_FLAG = 1,
  * @returns {Function} Returns the new bound function.
  * @example
  *
- * var greet = function(greeting, punctuation) {
+ * function greet(greeting, punctuation) {
  *   return greeting + ' ' + this.user + punctuation;
- * };
+ * }
  *
  * var object = { 'user': 'fred' };
  *
@@ -42,13 +42,13 @@ var BIND_FLAG = 1,
  * bound('hi');
  * // => 'hi fred!'
  */
-var bind = rest(function(func, thisArg, partials) {
+var bind = baseRest(function(func, thisArg, partials) {
   var bitmask = BIND_FLAG;
   if (partials.length) {
     var holders = replaceHolders(partials, getHolder(bind));
     bitmask |= PARTIAL_FLAG;
   }
-  return createWrapper(func, bitmask, thisArg, partials, holders);
+  return createWrap(func, bitmask, thisArg, partials, holders);
 });
 
 // Assign default placeholders.

bindAll.js

@@ -1,7 +1,7 @@
 var arrayEach = require('./_arrayEach'),
     baseFlatten = require('./_baseFlatten'),
+    baseRest = require('./_baseRest'),
     bind = require('./bind'),
-    rest = require('./rest'),
     toKey = require('./_toKey');
 
 /**
@@ -21,16 +21,16 @@ var arrayEach = require('./_arrayEach'),
  *
  * var view = {
  *   'label': 'docs',
- *   'onClick': function() {
+ *   'click': function() {
  *     console.log('clicked ' + this.label);
  *   }
  * };
  *
- * _.bindAll(view, ['onClick']);
- * jQuery(element).on('click', view.onClick);
+ * _.bindAll(view, ['click']);
+ * jQuery(element).on('click', view.click);
  * // => Logs 'clicked docs' when clicked.
  */
-var bindAll = rest(function(object, methodNames) {
+var bindAll = baseRest(function(object, methodNames) {
   arrayEach(baseFlatten(methodNames, 1), function(key) {
     key = toKey(key);
     object[key] = bind(object[key], object);

bindKey.js

@@ -1,9 +1,9 @@
-var createWrapper = require('./_createWrapper'),
+var baseRest = require('./_baseRest'),
+    createWrap = require('./_createWrap'),
     getHolder = require('./_getHolder'),
-    replaceHolders = require('./_replaceHolders'),
-    rest = require('./rest');
+    replaceHolders = require('./_replaceHolders');
 
-/** Used to compose bitmasks for wrapper metadata. */
+/** Used to compose bitmasks for function metadata. */
 var BIND_FLAG = 1,
     BIND_KEY_FLAG = 2,
     PARTIAL_FLAG = 32;
@@ -53,13 +53,13 @@ var BIND_FLAG = 1,
  * bound('hi');
  * // => 'hiya fred!'
  */
-var bindKey = rest(function(object, key, partials) {
+var bindKey = baseRest(function(object, key, partials) {
   var bitmask = BIND_FLAG | BIND_KEY_FLAG;
   if (partials.length) {
     var holders = replaceHolders(partials, getHolder(bindKey));
     bitmask |= PARTIAL_FLAG;
   }
-  return createWrapper(key, bitmask, object, partials, holders);
+  return createWrap(key, bitmask, object, partials, holders);
 });
 
 // Assign default placeholders.

collection.js

@@ -1,5 +1,4 @@
 module.exports = {
-  'at': require('./at'),
   'countBy': require('./countBy'),
   'each': require('./each'),
   'eachRight': require('./eachRight'),

cond.js

@@ -1,7 +1,7 @@
 var apply = require('./_apply'),
     arrayMap = require('./_arrayMap'),
     baseIteratee = require('./_baseIteratee'),
-    rest = require('./rest');
+    baseRest = require('./_baseRest');
 
 /** Used as the `TypeError` message for "Functions" methods. */
 var FUNC_ERROR_TEXT = 'Expected a function';
@@ -23,7 +23,7 @@ var FUNC_ERROR_TEXT = 'Expected a function';
  * var func = _.cond([
  *   [_.matches({ 'a': 1 }),           _.constant('matches A')],
  *   [_.conforms({ 'b': _.isNumber }), _.constant('matches B')],
- *   [_.constant(true),                _.constant('no match')]
+ *   [_.stubTrue,                      _.constant('no match')]
  * ]);
  *
  * func({ 'a': 1, 'b': 2 });
@@ -46,7 +46,7 @@ function cond(pairs) {
     return [toIteratee(pair[0]), pair[1]];
   });
 
-  return rest(function(args) {
+  return baseRest(function(args) {
     var index = -1;
     while (++index < length) {
       var pair = pairs[index];

conforms.js

@@ -6,6 +6,9 @@ var baseClone = require('./_baseClone'),
  * the corresponding property values of a given object, returning `true` if
  * all predicates return truthy, else `false`.
  *
+ * **Note:** The created function is equivalent to `_.conformsTo` with
+ * `source` partially applied.
+ *
  * @static
  * @memberOf _
  * @since 4.0.0
@@ -14,13 +17,13 @@ var baseClone = require('./_baseClone'),
  * @returns {Function} Returns the new spec function.
  * @example
  *
- * var users = [
- *   { 'user': 'barney', 'age': 36 },
- *   { 'user': 'fred',   'age': 40 }
+ * var objects = [
+ *   { 'a': 2, 'b': 1 },
+ *   { 'a': 1, 'b': 2 }
  * ];
  *
- * _.filter(users, _.conforms({ 'age': function(n) { return n > 38; } }));
- * // => [{ 'user': 'fred', 'age': 40 }]
+ * _.filter(objects, _.conforms({ 'b': function(n) { return n > 1; } }));
+ * // => [{ 'a': 1, 'b': 2 }]
  */
 function conforms(source) {
   return baseConforms(baseClone(source, true));

conformsTo.js

@@ -0,0 +1,32 @@
+var baseConformsTo = require('./_baseConformsTo'),
+    keys = require('./keys');
+
+/**
+ * Checks if `object` conforms to `source` by invoking the predicate
+ * properties of `source` with the corresponding property values of `object`.
+ *
+ * **Note:** This method is equivalent to `_.conforms` when `source` is
+ * partially applied.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.14.0
+ * @category Lang
+ * @param {Object} object The object to inspect.
+ * @param {Object} source The object of property predicates to conform to.
+ * @returns {boolean} Returns `true` if `object` conforms, else `false`.
+ * @example
+ *
+ * var object = { 'a': 1, 'b': 2 };
+ *
+ * _.conformsTo(object, { 'b': function(n) { return n > 1; } });
+ * // => true
+ *
+ * _.conformsTo(object, { 'b': function(n) { return n > 2; } });
+ * // => false
+ */
+function conformsTo(object, source) {
+  return source == null || baseConformsTo(object, source, keys(source));
+}
+
+module.exports = conformsTo;

core.js

@@ -13,12 +13,12 @@
   var undefined;
 
   /** Used as the semantic version number. */
-  var VERSION = '4.13.0';
+  var VERSION = '4.14.1';
 
   /** Used as the `TypeError` message for "Functions" methods. */
   var FUNC_ERROR_TEXT = 'Expected a function';
 
-  /** Used to compose bitmasks for wrapper metadata. */
+  /** Used to compose bitmasks for function metadata. */
   var BIND_FLAG = 1,
       PARTIAL_FLAG = 32;
 
@@ -57,23 +57,20 @@
     '`': '`'
   };
 
-  /** Detect free variable `exports`. */
-  var freeExports = typeof exports == 'object' && exports;
-
-  /** Detect free variable `module`. */
-  var freeModule = freeExports && typeof module == 'object' && module;
-
   /** Detect free variable `global` from Node.js. */
-  var freeGlobal = checkGlobal(typeof global == 'object' && global);
+  var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;
 
   /** Detect free variable `self`. */
-  var freeSelf = checkGlobal(typeof self == 'object' && self);
-
-  /** Detect `this` as the global object. */
-  var thisGlobal = checkGlobal(typeof this == 'object' && this);
+  var freeSelf = typeof self == 'object' && self && self.Object === Object && self;
 
   /** Used as a reference to the global object. */
-  var root = freeGlobal || freeSelf || thisGlobal || Function('return this')();
+  var root = freeGlobal || freeSelf || Function('return this')();
+
+  /** Detect free variable `exports`. */
+  var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;
+
+  /** Detect free variable `module`. */
+  var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;
 
   /*--------------------------------------------------------------------------*/
 
@@ -113,6 +110,32 @@
     return -1;
   }
 
+  /**
+   * The base implementation of `_.property` without support for deep paths.
+   *
+   * @private
+   * @param {string} key The key of the property to get.
+   * @returns {Function} Returns the new accessor function.
+   */
+  function baseProperty(key) {
+    return function(object) {
+      return object == null ? undefined : object[key];
+    };
+  }
+
+  /**
+   * The base implementation of `_.propertyOf` without support for deep paths.
+   *
+   * @private
+   * @param {Object} object The object to query.
+   * @returns {Function} Returns the new accessor function.
+   */
+  function basePropertyOf(object) {
+    return function(key) {
+      return object == null ? undefined : object[key];
+    };
+  }
+
   /**
    * The base implementation of `_.reduce` and `_.reduceRight`, without support
    * for iteratee shorthands, which iterates over `collection` using `eachFunc`.
@@ -151,17 +174,6 @@
     });
   }
 
-  /**
-   * Checks if `value` is a global object.
-   *
-   * @private
-   * @param {*} value The value to check.
-   * @returns {null|Object} Returns `value` if it's a global object, else `null`.
-   */
-  function checkGlobal(value) {
-    return (value && value.Object === Object) ? value : null;
-  }
-
   /**
    * Used by `_.escape` to convert characters to HTML entities.
    *
@@ -169,9 +181,7 @@
    * @param {string} chr The matched character to escape.
    * @returns {string} Returns the escaped character.
    */
-  function escapeHtmlChar(chr) {
-    return htmlEscapes[chr];
-  }
+  var escapeHtmlChar = basePropertyOf(htmlEscapes);
 
   /**
    * Checks if `value` is a host object in IE < 9.
@@ -184,6 +194,20 @@
     return false;
   }
 
+  /**
+   * Creates a function that invokes `func` with its first argument transformed.
+   *
+   * @private
+   * @param {Function} func The function to wrap.
+   * @param {Function} transform The argument transform.
+   * @returns {Function} Returns the new function.
+   */
+  function overArg(func, transform) {
+    return function(arg) {
+      return func(transform(arg));
+    };
+  }
+
   /*--------------------------------------------------------------------------*/
 
   /** Used for built-in method references. */
@@ -283,16 +307,16 @@
    *
    * The wrapper methods that are **not** chainable by default are:
    * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`,
-   * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `deburr`, `divide`, `each`,
-   * `eachRight`, `endsWith`, `eq`, `escape`, `escapeRegExp`, `every`, `find`,
-   * `findIndex`, `findKey`, `findLast`, `findLastIndex`, `findLastKey`, `first`,
-   * `floor`, `forEach`, `forEachRight`, `forIn`, `forInRight`, `forOwn`,
-   * `forOwnRight`, `get`, `gt`, `gte`, `has`, `hasIn`, `head`, `identity`,
-   * `includes`, `indexOf`, `inRange`, `invoke`, `isArguments`, `isArray`,
-   * `isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`, `isBoolean`,
-   * `isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`, `isEqualWith`,
-   * `isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`, `isMap`,
-   * `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`,
+   * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `conformsTo`, `deburr`,
+   * `defaultTo`, `divide`, `each`, `eachRight`, `endsWith`, `eq`, `escape`,
+   * `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, `findLast`,
+   * `findLastIndex`, `findLastKey`, `first`, `floor`, `forEach`, `forEachRight`,
+   * `forIn`, `forInRight`, `forOwn`, `forOwnRight`, `get`, `gt`, `gte`, `has`,
+   * `hasIn`, `head`, `identity`, `includes`, `indexOf`, `inRange`, `invoke`,
+   * `isArguments`, `isArray`, `isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`,
+   * `isBoolean`, `isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`,
+   * `isEqualWith`, `isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`,
+   * `isMap`, `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`,
    * `isNumber`, `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`,
    * `isSafeInteger`, `isSet`, `isString`, `isUndefined`, `isTypedArray`,
    * `isWeakMap`, `isWeakSet`, `join`, `kebabCase`, `last`, `lastIndexOf`,
@@ -407,13 +431,13 @@
   }
 
   /**
-   * The base implementation of `_.delay` and `_.defer` which accepts an array
-   * of `func` arguments.
+   * The base implementation of `_.delay` and `_.defer` which accepts `args`
+   * to provide to `func`.
    *
    * @private
    * @param {Function} func The function to delay.
    * @param {number} wait The number of milliseconds to delay invocation.
-   * @param {Object} args The arguments to provide to `func`.
+   * @param {Array} args The arguments to provide to `func`.
    * @returns {number} Returns the timer id.
    */
   function baseDelay(func, wait, args) {
@@ -573,7 +597,7 @@
   }
 
   /**
-   * The base implementation of `_.gt` which doesn't coerce arguments to numbers.
+   * The base implementation of `_.gt` which doesn't coerce arguments.
    *
    * @private
    * @param {*} value The value to compare.
@@ -585,6 +609,17 @@
     return value > other;
   }
 
+  /**
+   * The base implementation of `_.isDate` without Node.js optimizations.
+   *
+   * @private
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
+   */
+  function baseIsDate(value) {
+    return isObjectLike(value) && objectToString.call(value) == dateTag;
+  }
+
   /**
    * The base implementation of `_.isEqual` which supports partial comparisons
    * and tracks traversed objects.
@@ -644,13 +679,17 @@
         isSameTag = objTag == othTag;
 
     stack || (stack = []);
-    var stacked = find(stack, function(entry) {
-      return entry[0] === object;
+    var objStack = find(stack, function(entry) {
+      return entry[0] == object;
     });
-    if (stacked && stacked[1]) {
-      return stacked[1] == other;
+    var othStack = find(stack, function(entry) {
+      return entry[0] == other;
+    });
+    if (objStack && othStack) {
+      return objStack[1] == other;
     }
     stack.push([object, other]);
+    stack.push([other, object]);
     if (isSameTag && !objIsObj) {
       var result = (objIsArr)
         ? equalArrays(object, other, equalFunc, customizer, bitmask, stack)
@@ -679,6 +718,17 @@
     return result;
   }
 
+  /**
+   * The base implementation of `_.isRegExp` without Node.js optimizations.
+   *
+   * @private
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
+   */
+  function baseIsRegExp(value) {
+    return isObject(value) && objectToString.call(value) == regexpTag;
+  }
+
   /**
    * The base implementation of `_.iteratee`.
    *
@@ -704,9 +754,7 @@
    * @param {Object} object The object to query.
    * @returns {Array} Returns the array of property names.
    */
-  function baseKeys(object) {
-    return nativeKeys(Object(object));
-  }
+  var baseKeys = overArg(nativeKeys, Object);
 
   /**
    * The base implementation of `_.keysIn` which doesn't skip the constructor
@@ -727,7 +775,7 @@
   }
 
   /**
-   * The base implementation of `_.lt` which doesn't coerce arguments to numbers.
+   * The base implementation of `_.lt` which doesn't coerce arguments.
    *
    * @private
    * @param {*} value The value to compare.
@@ -804,15 +852,31 @@
   }
 
   /**
-   * The base implementation of `_.property` without support for deep paths.
+   * The base implementation of `_.rest` which doesn't validate or coerce arguments.
    *
    * @private
-   * @param {string} key The key of the property to get.
-   * @returns {Function} Returns the new accessor function.
+   * @param {Function} func The function to apply a rest parameter to.
+   * @param {number} [start=func.length-1] The start position of the rest parameter.
+   * @returns {Function} Returns the new function.
    */
-  function baseProperty(key) {
-    return function(object) {
-      return object == null ? undefined : object[key];
+  function baseRest(func, start) {
+    start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
+    return function() {
+      var args = arguments,
+          index = -1,
+          length = nativeMax(args.length - start, 0),
+          array = Array(length);
+
+      while (++index < length) {
+        array[index] = args[start + index];
+      }
+      index = -1;
+      var otherArgs = Array(start + 1);
+      while (++index < start) {
+        otherArgs[index] = args[index];
+      }
+      otherArgs[start] = array;
+      return func.apply(this, otherArgs);
     };
   }
 
@@ -953,9 +1017,9 @@
 
       var newValue = customizer
         ? customizer(object[key], source[key], key, object, source)
-        : source[key];
+        : undefined;
 
-      assignValue(object, key, newValue);
+      assignValue(object, key, newValue === undefined ? source[key] : newValue);
     }
     return object;
   }
@@ -968,7 +1032,7 @@
    * @returns {Function} Returns the new assigner function.
    */
   function createAssigner(assigner) {
-    return rest(function(object, sources) {
+    return baseRest(function(object, sources) {
       var index = -1,
           length = sources.length,
           customizer = length > 1 ? sources[length - 1] : undefined;
@@ -1049,7 +1113,7 @@
    * @param {Function} Ctor The constructor to wrap.
    * @returns {Function} Returns the new wrapped function.
    */
-  function createCtorWrapper(Ctor) {
+  function createCtor(Ctor) {
     return function() {
       // Use a `switch` statement to work with class constructors. See
       // http://ecma-international.org/ecma-262/6.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist
@@ -1064,25 +1128,44 @@
     };
   }
 
+  /**
+   * Creates a `_.find` or `_.findLast` function.
+   *
+   * @private
+   * @param {Function} findIndexFunc The function to find the collection index.
+   * @returns {Function} Returns the new find function.
+   */
+  function createFind(findIndexFunc) {
+    return function(collection, predicate, fromIndex) {
+      var iterable = Object(collection);
+      if (!isArrayLike(collection)) {
+        var iteratee = baseIteratee(predicate, 3);
+        collection = keys(collection);
+        predicate = function(key) { return iteratee(iterable[key], key, iterable); };
+      }
+      var index = findIndexFunc(collection, predicate, fromIndex);
+      return index > -1 ? iterable[iteratee ? collection[index] : index] : undefined;
+    };
+  }
+
   /**
    * Creates a function that wraps `func` to invoke it with the `this` binding
    * of `thisArg` and `partials` prepended to the arguments it receives.
    *
    * @private
    * @param {Function} func The function to wrap.
-   * @param {number} bitmask The bitmask of wrapper flags. See `createWrapper`
-   *  for more details.
+   * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
    * @param {*} thisArg The `this` binding of `func`.
    * @param {Array} partials The arguments to prepend to those provided to
    *  the new function.
    * @returns {Function} Returns the new wrapped function.
    */
-  function createPartialWrapper(func, bitmask, thisArg, partials) {
+  function createPartial(func, bitmask, thisArg, partials) {
     if (typeof func != 'function') {
       throw new TypeError(FUNC_ERROR_TEXT);
     }
     var isBind = bitmask & BIND_FLAG,
-        Ctor = createCtorWrapper(func);
+        Ctor = createCtor(func);
 
     function wrapper() {
       var argsIndex = -1,
@@ -1187,18 +1270,14 @@
 
       case boolTag:
       case dateTag:
-        // Coerce dates and booleans to numbers, dates to milliseconds and
-        // booleans to `1` or `0` treating invalid dates coerced to `NaN` as
-        // not equal.
-        return +object == +other;
+      case numberTag:
+        // Coerce booleans to `1` or `0` and dates to milliseconds.
+        // Invalid dates are coerced to `NaN`.
+        return eq(+object, +other);
 
       case errorTag:
         return object.name == other.name && object.message == other.message;
 
-      case numberTag:
-        // Treat `NaN` vs. `NaN` as equal.
-        return (object != +object) ? other != +other : object == +other;
-
       case regexpTag:
       case stringTag:
         // Coerce regexes to strings and treat strings, primitives and objects,
@@ -1374,7 +1453,7 @@
    * @since 1.1.0
    * @category Array
    * @param {Array} array The array to search.
-   * @param {Array|Function|Object|string} [predicate=_.identity]
+   * @param {Function} [predicate=_.identity]
    *  The function invoked per iteration.
    * @param {number} [fromIndex=0] The index to search from.
    * @returns {number} Returns the index of the found element, else `-1`.
@@ -1710,7 +1789,7 @@
    * @since 0.1.0
    * @category Collection
    * @param {Array|Object} collection The collection to iterate over.
-   * @param {Array|Function|Object|string} [predicate=_.identity]
+   * @param {Function} [predicate=_.identity]
    *  The function invoked per iteration.
    * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
    * @returns {boolean} Returns `true` if all elements pass the predicate check,
@@ -1747,12 +1826,14 @@
    * `predicate` returns truthy for. The predicate is invoked with three
    * arguments: (value, index|key, collection).
    *
+   * **Note:** Unlike `_.remove`, this method returns a new array.
+   *
    * @static
    * @memberOf _
    * @since 0.1.0
    * @category Collection
    * @param {Array|Object} collection The collection to iterate over.
-   * @param {Array|Function|Object|string} [predicate=_.identity]
+   * @param {Function} [predicate=_.identity]
    *  The function invoked per iteration.
    * @returns {Array} Returns the new filtered array.
    * @see _.reject
@@ -1792,7 +1873,7 @@
    * @since 0.1.0
    * @category Collection
    * @param {Array|Object} collection The collection to search.
-   * @param {Array|Function|Object|string} [predicate=_.identity]
+   * @param {Function} [predicate=_.identity]
    *  The function invoked per iteration.
    * @param {number} [fromIndex=0] The index to search from.
    * @returns {*} Returns the matched element, else `undefined`.
@@ -1819,11 +1900,7 @@
    * _.find(users, 'active');
    * // => object for 'barney'
    */
-  function find(collection, predicate, fromIndex) {
-    collection = isArrayLike(collection) ? collection : values(collection);
-    var index = findIndex(collection, predicate, fromIndex);
-    return index > -1 ? collection[index] : undefined;
-  }
+  var find = createFind(findIndex);
 
   /**
    * Iterates over elements of `collection` and invokes `iteratee` for each element.
@@ -1878,8 +1955,7 @@
    * @since 0.1.0
    * @category Collection
    * @param {Array|Object} collection The collection to iterate over.
-   * @param {Array|Function|Object|string} [iteratee=_.identity]
-   *  The function invoked per iteration.
+   * @param {Function} [iteratee=_.identity] The function invoked per iteration.
    * @returns {Array} Returns the new mapped array.
    * @example
    *
@@ -1986,8 +2062,7 @@
    * @since 0.1.0
    * @category Collection
    * @param {Array|Object} collection The collection to iterate over.
-   * @param {Array|Function|Object|string} [predicate=_.identity]
-   *  The function invoked per iteration.
+   * @param {Function} [predicate=_.identity] The function invoked per iteration.
    * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
    * @returns {boolean} Returns `true` if any element passes the predicate check,
    *  else `false`.
@@ -2029,8 +2104,8 @@
    * @since 0.1.0
    * @category Collection
    * @param {Array|Object} collection The collection to iterate over.
-   * @param {...(Array|Array[]|Function|Function[]|Object|Object[]|string|string[])}
-   *  [iteratees=[_.identity]] The iteratees to sort by.
+   * @param {...(Function|Function[])} [iteratees=[_.identity]]
+   *  The iteratees to sort by.
    * @returns {Array} Returns the new sorted array.
    * @example
    *
@@ -2080,7 +2155,7 @@
    * @example
    *
    * jQuery(element).on('click', _.before(5, addContactToList));
-   * // => allows adding up to 4 contacts to the list
+   * // => Allows adding up to 4 contacts to the list.
    */
   function before(n, func) {
     var result;
@@ -2119,9 +2194,9 @@
    * @returns {Function} Returns the new bound function.
    * @example
    *
-   * var greet = function(greeting, punctuation) {
+   * function greet(greeting, punctuation) {
    *   return greeting + ' ' + this.user + punctuation;
-   * };
+   * }
    *
    * var object = { 'user': 'fred' };
    *
@@ -2134,8 +2209,8 @@
    * bound('hi');
    * // => 'hi fred!'
    */
-  var bind = rest(function(func, thisArg, partials) {
-    return createPartialWrapper(func, BIND_FLAG | PARTIAL_FLAG, thisArg, partials);
+  var bind = baseRest(function(func, thisArg, partials) {
+    return createPartial(func, BIND_FLAG | PARTIAL_FLAG, thisArg, partials);
   });
 
   /**
@@ -2156,7 +2231,7 @@
    * }, 'deferred');
    * // => Logs 'deferred' after one or more milliseconds.
    */
-  var defer = rest(function(func, args) {
+  var defer = baseRest(function(func, args) {
     return baseDelay(func, 1, args);
   });
 
@@ -2179,7 +2254,7 @@
    * }, 1000, 'later');
    * // => Logs 'later' after one second.
    */
-  var delay = rest(function(func, wait, args) {
+  var delay = baseRest(function(func, wait, args) {
     return baseDelay(func, toNumber(wait) || 0, args);
   });
 
@@ -2208,7 +2283,8 @@
       throw new TypeError(FUNC_ERROR_TEXT);
     }
     return function() {
-      return !predicate.apply(this, arguments);
+      var args = arguments;
+      return !predicate.apply(this, args);
     };
   }
 
@@ -2228,61 +2304,12 @@
    * var initialize = _.once(createApplication);
    * initialize();
    * initialize();
-   * // `initialize` invokes `createApplication` once
+   * // => `createApplication` is invoked once
    */
   function once(func) {
     return before(2, func);
   }
 
-  /**
-   * Creates a function that invokes `func` with the `this` binding of the
-   * created function and arguments from `start` and beyond provided as
-   * an array.
-   *
-   * **Note:** This method is based on the
-   * [rest parameter](https://mdn.io/rest_parameters).
-   *
-   * @static
-   * @memberOf _
-   * @since 4.0.0
-   * @category Function
-   * @param {Function} func The function to apply a rest parameter to.
-   * @param {number} [start=func.length-1] The start position of the rest parameter.
-   * @returns {Function} Returns the new function.
-   * @example
-   *
-   * var say = _.rest(function(what, names) {
-   *   return what + ' ' + _.initial(names).join(', ') +
-   *     (_.size(names) > 1 ? ', & ' : '') + _.last(names);
-   * });
-   *
-   * say('hello', 'fred', 'barney', 'pebbles');
-   * // => 'hello fred, barney, & pebbles'
-   */
-  function rest(func, start) {
-    if (typeof func != 'function') {
-      throw new TypeError(FUNC_ERROR_TEXT);
-    }
-    start = nativeMax(start === undefined ? (func.length - 1) : toInteger(start), 0);
-    return function() {
-      var args = arguments,
-          index = -1,
-          length = nativeMax(args.length - start, 0),
-          array = Array(length);
-
-      while (++index < length) {
-        array[index] = args[start + index];
-      }
-      var otherArgs = Array(start + 1);
-      index = -1;
-      while (++index < start) {
-        otherArgs[index] = args[index];
-      }
-      otherArgs[start] = array;
-      return func.apply(this, otherArgs);
-    };
-  }
-
   /*------------------------------------------------------------------------*/
 
   /**
@@ -2332,8 +2359,8 @@
    * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
    * @example
    *
-   * var object = { 'user': 'fred' };
-   * var other = { 'user': 'fred' };
+   * var object = { 'a': 1 };
+   * var other = { 'a': 1 };
    *
    * _.eq(object, object);
    * // => true
@@ -2362,7 +2389,7 @@
    * @since 0.1.0
    * @category Lang
    * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is correctly classified,
+   * @returns {boolean} Returns `true` if `value` is an `arguments` object,
    *  else `false`.
    * @example
    *
@@ -2384,11 +2411,9 @@
    * @static
    * @memberOf _
    * @since 0.1.0
-   * @type {Function}
    * @category Lang
    * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is correctly classified,
-   *  else `false`.
+   * @returns {boolean} Returns `true` if `value` is an array, else `false`.
    * @example
    *
    * _.isArray([1, 2, 3]);
@@ -2471,8 +2496,7 @@
    * @since 0.1.0
    * @category Lang
    * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is correctly classified,
-   *  else `false`.
+   * @returns {boolean} Returns `true` if `value` is a boolean, else `false`.
    * @example
    *
    * _.isBoolean(false);
@@ -2494,8 +2518,7 @@
    * @since 0.1.0
    * @category Lang
    * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is correctly classified,
-   *  else `false`.
+   * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
    * @example
    *
    * _.isDate(new Date);
@@ -2504,9 +2527,7 @@
    * _.isDate('Mon April 23 2012');
    * // => false
    */
-  function isDate(value) {
-    return isObjectLike(value) && objectToString.call(value) == dateTag;
-  }
+  var isDate = baseIsDate;
 
   /**
    * Checks if `value` is an empty object, collection, map, or set.
@@ -2570,8 +2591,8 @@
    *  else `false`.
    * @example
    *
-   * var object = { 'user': 'fred' };
-   * var other = { 'user': 'fred' };
+   * var object = { 'a': 1 };
+   * var other = { 'a': 1 };
    *
    * _.isEqual(object, other);
    * // => true
@@ -2622,8 +2643,7 @@
    * @since 0.1.0
    * @category Lang
    * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is correctly classified,
-   *  else `false`.
+   * @returns {boolean} Returns `true` if `value` is a function, else `false`.
    * @example
    *
    * _.isFunction(_);
@@ -2797,8 +2817,7 @@
    * @since 0.1.0
    * @category Lang
    * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is correctly classified,
-   *  else `false`.
+   * @returns {boolean} Returns `true` if `value` is a number, else `false`.
    * @example
    *
    * _.isNumber(3);
@@ -2826,8 +2845,7 @@
    * @since 0.1.0
    * @category Lang
    * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is correctly classified,
-   *  else `false`.
+   * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
    * @example
    *
    * _.isRegExp(/abc/);
@@ -2836,9 +2854,7 @@
    * _.isRegExp('/abc/');
    * // => false
    */
-  function isRegExp(value) {
-    return isObject(value) && objectToString.call(value) == regexpTag;
-  }
+  var isRegExp = baseIsRegExp;
 
   /**
    * Checks if `value` is classified as a `String` primitive or object.
@@ -2848,8 +2864,7 @@
    * @memberOf _
    * @category Lang
    * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is correctly classified,
-   *  else `false`.
+   * @returns {boolean} Returns `true` if `value` is a string, else `false`.
    * @example
    *
    * _.isString('abc');
@@ -3016,18 +3031,18 @@
    * @example
    *
    * function Foo() {
-   *   this.c = 3;
+   *   this.a = 1;
    * }
    *
    * function Bar() {
-   *   this.e = 5;
+   *   this.c = 3;
    * }
    *
-   * Foo.prototype.d = 4;
-   * Bar.prototype.f = 6;
+   * Foo.prototype.b = 2;
+   * Bar.prototype.d = 4;
    *
-   * _.assign({ 'a': 1 }, new Foo, new Bar);
-   * // => { 'a': 1, 'c': 3, 'e': 5 }
+   * _.assign({ 'a': 0 }, new Foo, new Bar);
+   * // => { 'a': 1, 'c': 3 }
    */
   var assign = createAssigner(function(object, source) {
     copyObject(source, keys(source), object);
@@ -3051,18 +3066,18 @@
    * @example
    *
    * function Foo() {
-   *   this.b = 2;
+   *   this.a = 1;
    * }
    *
    * function Bar() {
-   *   this.d = 4;
+   *   this.c = 3;
    * }
    *
-   * Foo.prototype.c = 3;
-   * Bar.prototype.e = 5;
+   * Foo.prototype.b = 2;
+   * Bar.prototype.d = 4;
    *
-   * _.assignIn({ 'a': 1 }, new Foo, new Bar);
-   * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5 }
+   * _.assignIn({ 'a': 0 }, new Foo, new Bar);
+   * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }
    */
   var assignIn = createAssigner(function(object, source) {
     copyObject(source, keysIn(source), object);
@@ -3158,10 +3173,10 @@
    * @see _.defaultsDeep
    * @example
    *
-   * _.defaults({ 'user': 'barney' }, { 'age': 36 }, { 'user': 'fred' });
-   * // => { 'user': 'barney', 'age': 36 }
+   * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
+   * // => { 'a': 1, 'b': 2 }
    */
-  var defaults = rest(function(args) {
+  var defaults = baseRest(function(args) {
     args.push(undefined, assignInDefaults);
     return assignInWith.apply(undefined, args);
   });
@@ -3269,7 +3284,7 @@
    * _.pick(object, ['a', 'c']);
    * // => { 'a': 1, 'c': 3 }
    */
-  var pick = rest(function(object, props) {
+  var pick = baseRest(function(object, props) {
     return object == null ? {} : basePick(object, baseMap(baseFlatten(props, 1), toKey));
   });
 
@@ -3386,7 +3401,7 @@
   /*------------------------------------------------------------------------*/
 
   /**
-   * This method returns the first argument given to it.
+   * This method returns the first argument it receives.
    *
    * @static
    * @since 0.1.0
@@ -3396,7 +3411,7 @@
    * @returns {*} Returns `value`.
    * @example
    *
-   * var object = { 'user': 'fred' };
+   * var object = { 'a': 1 };
    *
    * console.log(_.identity(object) === object);
    * // => true
@@ -3452,10 +3467,10 @@
   /**
    * Creates a function that performs a partial deep comparison between a given
    * object and `source`, returning `true` if the given object has equivalent
-   * property values, else `false`. The created function is equivalent to
-   * `_.isMatch` with a `source` partially applied.
+   * property values, else `false`.
    *
-   * **Note:** This method supports comparing the same values as `_.isEqual`.
+   * **Note:** The created function supports comparing the same values as
+   * `_.isEqual` is equivalent to `_.isMatch` with `source` partially applied.
    *
    * @static
    * @memberOf _
@@ -3465,13 +3480,13 @@
    * @returns {Function} Returns the new spec function.
    * @example
    *
-   * var users = [
-   *   { 'user': 'barney', 'age': 36, 'active': true },
-   *   { 'user': 'fred',   'age': 40, 'active': false }
+   * var objects = [
+   *   { 'a': 1, 'b': 2, 'c': 3 },
+   *   { 'a': 4, 'b': 5, 'c': 6 }
    * ];
    *
-   * _.filter(users, _.matches({ 'age': 40, 'active': false }));
-   * // => [{ 'user': 'fred', 'age': 40, 'active': false }]
+   * _.filter(objects, _.matches({ 'a': 4, 'c': 6 }));
+   * // => [{ 'a': 4, 'b': 5, 'c': 6 }]
    */
   function matches(source) {
     return baseMatches(assign({}, source));
@@ -3570,7 +3585,7 @@
   }
 
   /**
-   * A method that returns `undefined`.
+   * This method returns `undefined`.
    *
    * @static
    * @memberOf _
@@ -3780,22 +3795,21 @@
 
   /*--------------------------------------------------------------------------*/
 
-  // Expose Lodash on the free variable `window` or `self` when available so it's
-  // globally accessible, even when bundled with Browserify, Webpack, etc. This
-  // also prevents errors in cases where Lodash is loaded by a script tag in the
-  // presence of an AMD loader. See http://requirejs.org/docs/errors.html#mismatch
-  // for more details. Use `_.noConflict` to remove Lodash from the global object.
-  (freeSelf || {})._ = lodash;
-
-  // Some AMD build optimizers like r.js check for condition patterns like the following:
+  // Some AMD build optimizers, like r.js, check for condition patterns like:
   if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
+    // Expose Lodash on the global object to prevent errors when Lodash is
+    // loaded by a script tag in the presence of an AMD loader.
+    // See http://requirejs.org/docs/errors.html#mismatch for more details.
+    // Use `_.noConflict` to remove Lodash from the global object.
+    root._ = lodash;
+
     // Define as an anonymous module so, through path mapping, it can be
     // referenced as the "underscore" module.
     define(function() {
       return lodash;
     });
   }
-  // Check for `exports` after `define` in case a build optimizer adds an `exports` object.
+  // Check for `exports` after `define` in case a build optimizer adds it.
   else if (freeModule) {
     // Export for Node.js.
     (freeModule.exports = lodash)._ = lodash;

core.min.js

@@ -3,26 +3,26 @@
  * lodash (Custom Build) /license | Underscore.js 1.8.3 underscorejs.org/LICENSE
  * Build: `lodash core -o ./dist/lodash.core.js`
  */
-;(function(){function n(n){n=null==n?n:Object(n);var t,r=[];for(t in n)r.push(t);return r}function t(n){return On(Object(n))}function r(n,t){return n.push.apply(n,t),n}function e(n,t,r,e,u){return u(n,function(n,u,o){r=e?(e=false,n):t(r,n,u,o)}),r}function u(n,t){return x(t,function(t){return n[t]})}function o(n){return n&&n.Object===Object?n:null}function i(n){return fn[n]}function c(n){return n instanceof f?n:new f(n)}function f(n,t){this.__wrapped__=n,this.__actions__=[],this.__chain__=!!t}function a(n,t,r,e){
-var u;return(u=n===en)||(u=vn[r],u=(n===u||n!==n&&u!==u)&&!yn.call(e,r)),u?t:n}function l(n){return Q(n)?jn(n):{}}function p(n,t,r){if(typeof n!="function")throw new TypeError("Expected a function");return setTimeout(function(){n.apply(en,r)},t)}function s(n,t){var r=true;return En(n,function(n,e,u){return r=!!t(n,e,u)}),r}function h(n,t,r){for(var e=-1,u=n.length;++e<u;){var o=n[e],i=t(o);if(null!=i&&(c===en?i===i:r(i,c)))var c=i,f=o}return f}function v(n,t){var r=[];return En(n,function(n,e,u){t(n,e,u)&&r.push(n);
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+return B(n,t,r)}),En=A(function(n,t){return a(n,1,t)}),wn=A(function(n,t,r){return a(n,Sn(t)||0,r)}),kn=Array.isArray,Nn=Number,Sn=Number,Tn=T(function(n,t){S(t,Dn(t),n)}),Fn=T(function(t,r){S(r,n(r),t)}),Bn=T(function(t,r,e,u){S(r,n(r),t,u)}),Rn=A(function(n){return n.push(Z,c),Bn.apply(Z,n)}),Dn=mn,mn=A(function(n,t){return null==n?{}:x(n,m(h(t,1),xn))});o.assignIn=Fn,o.before=G,o.bind=gn,o.chain=function(n){return n=o(n),n.__chain__=true,n},o.compact=function(n){return s(n,Boolean)},o.concat=function(){
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+return function(){return!n.apply(this,arguments)}},o.once=function(n){return G(2,n)},o.pick=mn,o.slice=function(n,t,r){var e=n?n.length:0;return r=r===Z?e:+r,e?E(n,null==t?0:+t,r):[]},o.sortBy=function(n,t){var e=0;return t=j(t),m(m(n,function(n,r,u){return{value:n,index:e++,criteria:t(n,r,u)}}).sort(function(n,t){var r;n:{r=n.criteria;var e=t.criteria;if(r!==e){var u=r!==Z,o=null===r,i=r===r,c=e!==Z,f=null===e,a=e===e;if(!f&&r>e||o&&c&&a||!u&&a||!i){r=1;break n}if(!o&&r<e||f&&u&&i||!c&&i||!a){r=-1;
+break n}}r=0}return r||n.index-t.index}),r("value"))},o.tap=function(n,t){return t(n),n},o.thru=function(n,t){return t(n)},o.toArray=function(n){return P(n)?n.length?w(n):[]:W(n)},o.values=W,o.extend=Fn,Y(o,o),o.clone=function(n){return V(n)?kn(n)?w(n):S(n,Dn(n)):n},o.escape=function(n){return(n=Q(n))&&rn.test(n)?n.replace(tn,cn):n},o.every=function(n,t,r){return t=r?Z:t,l(n,j(t))},o.find=An,o.forEach=z,o.has=function(n,t){return null!=n&&ln.call(n,t)},o.head=q,o.identity=X,o.indexOf=$,o.isArguments=M,
+o.isArray=kn,o.isBoolean=function(n){return true===n||false===n||H(n)&&"[object Boolean]"==sn.call(n)},o.isDate=function(n){return H(n)&&"[object Date]"==sn.call(n)},o.isEmpty=function(n){return P(n)&&(kn(n)||L(n)||U(n.splice)||M(n))?!n.length:!Dn(n).length},o.isEqual=function(n,t){return g(n,t)},o.isFinite=function(n){return typeof n=="number"&&yn(n)},o.isFunction=U,o.isNaN=function(n){return K(n)&&n!=+n},o.isNull=function(n){return null===n},o.isNumber=K,o.isObject=V,o.isRegExp=function(n){return V(n)&&"[object RegExp]"==sn.call(n);
+},o.isString=L,o.isUndefined=function(n){return n===Z},o.last=function(n){var t=n?n.length:0;return t?n[t-1]:Z},o.max=function(n){return n&&n.length?p(n,X,y):Z},o.min=function(n){return n&&n.length?p(n,X,d):Z},o.noConflict=function(){return un._===this&&(un._=hn),this},o.noop=function(){},o.reduce=C,o.result=function(n,t,r){return t=null==n?Z:n[t],t===Z&&(t=r),U(t)?t.call(n):t},o.size=function(n){return null==n?0:(n=P(n)?n:Dn(n),n.length)},o.some=function(n,t,r){return t=r?Z:t,k(n,j(t))},o.uniqueId=function(n){
+var t=++pn;return Q(n)+t},o.each=z,o.first=q,Y(o,function(){var n={};return v(o,function(t,r){ln.call(o.prototype,r)||(n[r]=t)}),n}(),{chain:false}),o.VERSION="4.14.1",jn("pop join replace reverse split push shift sort splice unshift".split(" "),function(n){var t=(/^(?:replace|split)$/.test(n)?String.prototype:fn)[n],r=/^(?:push|sort|unshift)$/.test(n)?"tap":"thru",e=/^(?:pop|join|replace|shift)$/.test(n);o.prototype[n]=function(){var n=arguments;if(e&&!this.__chain__){var u=this.value();return t.apply(kn(u)?u:[],n);
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countBy.js

@@ -17,7 +17,7 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * @since 0.5.0
  * @category Collection
  * @param {Array|Object} collection The collection to iterate over.
- * @param {Array|Function|Object|string} [iteratee=_.identity]
+ * @param {Function} [iteratee=_.identity]
  *  The iteratee to transform keys.
  * @returns {Object} Returns the composed aggregate object.
  * @example

curry.js

@@ -1,6 +1,6 @@
-var createWrapper = require('./_createWrapper');
+var createWrap = require('./_createWrap');
 
-/** Used to compose bitmasks for wrapper metadata. */
+/** Used to compose bitmasks for function metadata. */
 var CURRY_FLAG = 8;
 
 /**
@@ -46,7 +46,7 @@ var CURRY_FLAG = 8;
  */
 function curry(func, arity, guard) {
   arity = guard ? undefined : arity;
-  var result = createWrapper(func, CURRY_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
+  var result = createWrap(func, CURRY_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
   result.placeholder = curry.placeholder;
   return result;
 }

curryRight.js

@@ -1,6 +1,6 @@
-var createWrapper = require('./_createWrapper');
+var createWrap = require('./_createWrap');
 
-/** Used to compose bitmasks for wrapper metadata. */
+/** Used to compose bitmasks for function metadata. */
 var CURRY_RIGHT_FLAG = 16;
 
 /**
@@ -43,7 +43,7 @@ var CURRY_RIGHT_FLAG = 16;
  */
 function curryRight(func, arity, guard) {
   arity = guard ? undefined : arity;
-  var result = createWrapper(func, CURRY_RIGHT_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
+  var result = createWrap(func, CURRY_RIGHT_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
   result.placeholder = curryRight.placeholder;
   return result;
 }

debounce.js

@@ -14,14 +14,18 @@ var nativeMax = Math.max,
  * milliseconds have elapsed since the last time the debounced function was
  * invoked. The debounced function comes with a `cancel` method to cancel
  * delayed `func` invocations and a `flush` method to immediately invoke them.
- * Provide an options object to indicate whether `func` should be invoked on
- * the leading and/or trailing edge of the `wait` timeout. The `func` is invoked
- * with the last arguments provided to the debounced function. Subsequent calls
- * to the debounced function return the result of the last `func` invocation.
+ * Provide `options` to indicate whether `func` should be invoked on the
+ * leading and/or trailing edge of the `wait` timeout. The `func` is invoked
+ * with the last arguments provided to the debounced function. Subsequent
+ * calls to the debounced function return the result of the last `func`
+ * invocation.
  *
- * **Note:** If `leading` and `trailing` options are `true`, `func` is invoked
- * on the trailing edge of the timeout only if the debounced function is
- * invoked more than once during the `wait` timeout.
+ * **Note:** If `leading` and `trailing` options are `true`, `func` is
+ * invoked on the trailing edge of the timeout only if the debounced function
+ * is invoked more than once during the `wait` timeout.
+ *
+ * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
+ * until to the next tick, similar to `setTimeout` with a timeout of `0`.
  *
  * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
  * for details over the differences between `_.debounce` and `_.throttle`.
@@ -142,6 +146,9 @@ function debounce(func, wait, options) {
   }
 
   function cancel() {
+    if (timerId !== undefined) {
+      clearTimeout(timerId);
+    }
     lastInvokeTime = 0;
     lastArgs = lastCallTime = lastThis = timerId = undefined;
   }

defaultTo.js

@@ -0,0 +1,25 @@
+/**
+ * Checks `value` to determine whether a default value should be returned in
+ * its place. The `defaultValue` is returned if `value` is `NaN`, `null`,
+ * or `undefined`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.14.0
+ * @category Util
+ * @param {*} value The value to check.
+ * @param {*} defaultValue The default value.
+ * @returns {*} Returns the resolved value.
+ * @example
+ *
+ * _.defaultTo(1, 10);
+ * // => 1
+ *
+ * _.defaultTo(undefined, 10);
+ * // => 10
+ */
+function defaultTo(value, defaultValue) {
+  return (value == null || value !== value) ? defaultValue : value;
+}
+
+module.exports = defaultTo;

defaults.js

@@ -1,7 +1,7 @@
 var apply = require('./_apply'),
     assignInDefaults = require('./_assignInDefaults'),
     assignInWith = require('./assignInWith'),
-    rest = require('./rest');
+    baseRest = require('./_baseRest');
 
 /**
  * Assigns own and inherited enumerable string keyed properties of source
@@ -21,10 +21,10 @@ var apply = require('./_apply'),
  * @see _.defaultsDeep
  * @example
  *
- * _.defaults({ 'user': 'barney' }, { 'age': 36 }, { 'user': 'fred' });
- * // => { 'user': 'barney', 'age': 36 }
+ * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
+ * // => { 'a': 1, 'b': 2 }
  */
-var defaults = rest(function(args) {
+var defaults = baseRest(function(args) {
   args.push(undefined, assignInDefaults);
   return apply(assignInWith, undefined, args);
 });

defaultsDeep.js

@@ -1,7 +1,7 @@
 var apply = require('./_apply'),
+    baseRest = require('./_baseRest'),
     mergeDefaults = require('./_mergeDefaults'),
-    mergeWith = require('./mergeWith'),
-    rest = require('./rest');
+    mergeWith = require('./mergeWith');
 
 /**
  * This method is like `_.defaults` except that it recursively assigns
@@ -19,11 +19,10 @@ var apply = require('./_apply'),
  * @see _.defaults
  * @example
  *
- * _.defaultsDeep({ 'user': { 'name': 'barney' } }, { 'user': { 'name': 'fred', 'age': 36 } });
- * // => { 'user': { 'name': 'barney', 'age': 36 } }
- *
+ * _.defaultsDeep({ 'a': { 'b': 2 } }, { 'a': { 'b': 1, 'c': 3 } });
+ * // => { 'a': { 'b': 2, 'c': 3 } }
  */
-var defaultsDeep = rest(function(args) {
+var defaultsDeep = baseRest(function(args) {
   args.push(undefined, mergeDefaults);
   return apply(mergeWith, undefined, args);
 });

defer.js

@@ -1,5 +1,5 @@
 var baseDelay = require('./_baseDelay'),
-    rest = require('./rest');
+    baseRest = require('./_baseRest');
 
 /**
  * Defers invoking the `func` until the current call stack has cleared. Any
@@ -19,7 +19,7 @@ var baseDelay = require('./_baseDelay'),
  * }, 'deferred');
  * // => Logs 'deferred' after one or more milliseconds.
  */
-var defer = rest(function(func, args) {
+var defer = baseRest(function(func, args) {
   return baseDelay(func, 1, args);
 });
 

delay.js

@@ -1,5 +1,5 @@
 var baseDelay = require('./_baseDelay'),
-    rest = require('./rest'),
+    baseRest = require('./_baseRest'),
     toNumber = require('./toNumber');
 
 /**
@@ -21,7 +21,7 @@ var baseDelay = require('./_baseDelay'),
  * }, 1000, 'later');
  * // => Logs 'later' after one second.
  */
-var delay = rest(function(func, wait, args) {
+var delay = baseRest(function(func, wait, args) {
   return baseDelay(func, toNumber(wait) || 0, args);
 });
 

difference.js

@@ -1,14 +1,16 @@
 var baseDifference = require('./_baseDifference'),
     baseFlatten = require('./_baseFlatten'),
-    isArrayLikeObject = require('./isArrayLikeObject'),
-    rest = require('./rest');
+    baseRest = require('./_baseRest'),
+    isArrayLikeObject = require('./isArrayLikeObject');
 
 /**
- * Creates an array of unique `array` values not included in the other given
- * arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * Creates an array of `array` values not included in the other given arrays
+ * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
  * for equality comparisons. The order of result values is determined by the
  * order they occur in the first array.
  *
+ * **Note:** Unlike `_.pullAll`, this method returns a new array.
+ *
  * @static
  * @memberOf _
  * @since 0.1.0
@@ -22,7 +24,7 @@ var baseDifference = require('./_baseDifference'),
  * _.difference([2, 1], [2, 3]);
  * // => [1]
  */
-var difference = rest(function(array, values) {
+var difference = baseRest(function(array, values) {
   return isArrayLikeObject(array)
     ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true))
     : [];