Bump to v4.16.5.

LICENSE

@@ -1,4 +1,4 @@
-Copyright jQuery Foundation and other contributors <https://jquery.org/>
+Copyright JS Foundation and other contributors <https://js.foundation/>
 
 Based on Underscore.js, copyright Jeremy Ashkenas,
 DocumentCloud and Investigative Reporters & Editors <http://underscorejs.org/>

README.md

@@ -1,4 +1,4 @@
-# lodash-es v4.16.2
+# lodash-es v4.16.5
 
 The [Lodash](https://lodash.com/) library exported as [ES](http://www.ecma-international.org/ecma-262/6.0/) modules.
 
@@ -7,4 +7,4 @@ Generated using [lodash-cli](https://www.npmjs.com/package/lodash-cli):
 $ lodash modularize exports=es -o ./
 ```
 
-See the [package source](https://github.com/lodash/lodash/tree/4.16.2-es) for more details.
+See the [package source](https://github.com/lodash/lodash/tree/4.16.5-es) for more details.

_Hash.js

@@ -13,7 +13,7 @@ import hashSet from './_hashSet.js';
  */
 function Hash(entries) {
   var index = -1,
-      length = entries ? entries.length : 0;
+      length = entries == null ? 0 : entries.length;
 
   this.clear();
   while (++index < length) {

_ListCache.js

@@ -13,7 +13,7 @@ import listCacheSet from './_listCacheSet.js';
  */
 function ListCache(entries) {
   var index = -1,
-      length = entries ? entries.length : 0;
+      length = entries == null ? 0 : entries.length;
 
   this.clear();
   while (++index < length) {

_MapCache.js

@@ -13,7 +13,7 @@ import mapCacheSet from './_mapCacheSet.js';
  */
 function MapCache(entries) {
   var index = -1,
-      length = entries ? entries.length : 0;
+      length = entries == null ? 0 : entries.length;
 
   this.clear();
   while (++index < length) {

_SetCache.js

@@ -12,7 +12,7 @@ import setCacheHas from './_setCacheHas.js';
  */
 function SetCache(values) {
   var index = -1,
-      length = values ? values.length : 0;
+      length = values == null ? 0 : values.length;
 
   this.__data__ = new MapCache;
   while (++index < length) {

_arrayAggregator.js

@@ -10,7 +10,7 @@
  */
 function arrayAggregator(array, setter, iteratee, accumulator) {
   var index = -1,
-      length = array ? array.length : 0;
+      length = array == null ? 0 : array.length;
 
   while (++index < length) {
     var value = array[index];

_arrayEach.js

@@ -9,7 +9,7 @@
  */
 function arrayEach(array, iteratee) {
   var index = -1,
-      length = array ? array.length : 0;
+      length = array == null ? 0 : array.length;
 
   while (++index < length) {
     if (iteratee(array[index], index, array) === false) {

_arrayEachRight.js

@@ -8,7 +8,7 @@
  * @returns {Array} Returns `array`.
  */
 function arrayEachRight(array, iteratee) {
-  var length = array ? array.length : 0;
+  var length = array == null ? 0 : array.length;
 
   while (length--) {
     if (iteratee(array[length], length, array) === false) {

_arrayEvery.js

@@ -10,7 +10,7 @@
  */
 function arrayEvery(array, predicate) {
   var index = -1,
-      length = array ? array.length : 0;
+      length = array == null ? 0 : array.length;
 
   while (++index < length) {
     if (!predicate(array[index], index, array)) {

_arrayFilter.js

@@ -9,7 +9,7 @@
  */
 function arrayFilter(array, predicate) {
   var index = -1,
-      length = array ? array.length : 0,
+      length = array == null ? 0 : array.length,
       resIndex = 0,
       result = [];
 

_arrayIncludes.js

@@ -10,7 +10,7 @@ import baseIndexOf from './_baseIndexOf.js';
  * @returns {boolean} Returns `true` if `target` is found, else `false`.
  */
 function arrayIncludes(array, value) {
-  var length = array ? array.length : 0;
+  var length = array == null ? 0 : array.length;
   return !!length && baseIndexOf(array, value, 0) > -1;
 }
 

_arrayIncludesWith.js

@@ -9,7 +9,7 @@
  */
 function arrayIncludesWith(array, value, comparator) {
   var index = -1,
-      length = array ? array.length : 0;
+      length = array == null ? 0 : array.length;
 
   while (++index < length) {
     if (comparator(value, array[index])) {

_arrayLikeKeys.js

@@ -1,7 +1,9 @@
 import baseTimes from './_baseTimes.js';
 import isArguments from './isArguments.js';
 import isArray from './isArray.js';
+import isBuffer from './isBuffer.js';
 import isIndex from './_isIndex.js';
+import isTypedArray from './isTypedArray.js';
 
 /** Used for built-in method references. */
 var objectProto = Object.prototype;
@@ -18,18 +20,26 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * @returns {Array} Returns the array of property names.
  */
 function arrayLikeKeys(value, inherited) {
-  // Safari 8.1 makes `arguments.callee` enumerable in strict mode.
+  var isArr = isArray(value),
-  // Safari 9 makes `arguments.length` enumerable in strict mode.
+      isArg = !isArr && isArguments(value),
-  var result = (isArray(value) || isArguments(value))
+      isBuff = !isArr && !isArg && isBuffer(value),
-    ? baseTimes(value.length, String)
+      isType = !isArr && !isArg && !isBuff && isTypedArray(value),
-    : [];
+      skipIndexes = isArr || isArg || isBuff || isType,
-
+      result = skipIndexes ? baseTimes(value.length, String) : [],
-  var length = result.length,
+      length = result.length;
-      skipIndexes = !!length;
 
   for (var key in value) {
     if ((inherited || hasOwnProperty.call(value, key)) &&
-        !(skipIndexes && (key == 'length' || isIndex(key, length)))) {
+        !(skipIndexes && (
+           // Safari 9 has enumerable `arguments.length` in strict mode.
+           key == 'length' ||
+           // Node.js 0.10 has enumerable non-index properties on buffers.
+           (isBuff && (key == 'offset' || key == 'parent')) ||
+           // PhantomJS 2 has enumerable non-index properties on typed arrays.
+           (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||
+           // Skip index properties.
+           isIndex(key, length)
+        ))) {
       result.push(key);
     }
   }

_arrayMap.js

@@ -9,7 +9,7 @@
  */
 function arrayMap(array, iteratee) {
   var index = -1,
-      length = array ? array.length : 0,
+      length = array == null ? 0 : array.length,
       result = Array(length);
 
   while (++index < length) {

_arrayReduce.js

@@ -12,7 +12,7 @@
  */
 function arrayReduce(array, iteratee, accumulator, initAccum) {
   var index = -1,
-      length = array ? array.length : 0;
+      length = array == null ? 0 : array.length;
 
   if (initAccum && length) {
     accumulator = array[++index];

_arrayReduceRight.js

@@ -11,7 +11,7 @@
  * @returns {*} Returns the accumulated value.
  */
 function arrayReduceRight(array, iteratee, accumulator, initAccum) {
-  var length = array ? array.length : 0;
+  var length = array == null ? 0 : array.length;
   if (initAccum && length) {
     accumulator = array[--length];
   }

_arraySampleSize.js

@@ -1,3 +1,4 @@
+import baseClamp from './_baseClamp.js';
 import copyArray from './_copyArray.js';
 import shuffleSelf from './_shuffleSelf.js';
 
@@ -10,7 +11,7 @@ import shuffleSelf from './_shuffleSelf.js';
  * @returns {Array} Returns the random elements.
  */
 function arraySampleSize(array, n) {
-  return shuffleSelf(copyArray(array), n);
+  return shuffleSelf(copyArray(array), baseClamp(n, 0, array.length));
 }
 
 export default arraySampleSize;

_arraySome.js

@@ -10,7 +10,7 @@
  */
 function arraySome(array, predicate) {
   var index = -1,
-      length = array ? array.length : 0;
+      length = array == null ? 0 : array.length;
 
   while (++index < length) {
     if (predicate(array[index], index, array)) {

_assignMergeValue.js

@@ -12,7 +12,7 @@ import eq from './eq.js';
  */
 function assignMergeValue(object, key, value) {
   if ((value !== undefined && !eq(object[key], value)) ||
-      (typeof key == 'number' && value === undefined && !(key in object))) {
+      (value === undefined && !(key in object))) {
     baseAssignValue(object, key, value);
   }
 }

_baseAssignValue.js

@@ -1,5 +1,4 @@
-/** Built-in value references. */
+import defineProperty from './_defineProperty.js';
-var defineProperty = Object.defineProperty;
 
 /**
  * The base implementation of `assignValue` and `assignMergeValue` without

_baseAt.js

@@ -10,12 +10,12 @@ import get from './get.js';
  */
 function baseAt(object, paths) {
   var index = -1,
-      isNil = object == null,
       length = paths.length,
-      result = Array(length);
+      result = Array(length),
+      skip = object == null;
 
   while (++index < length) {
-    result[index] = isNil ? undefined : get(object, paths[index]);
+    result[index] = skip ? undefined : get(object, paths[index]);
   }
   return result;
 }

_baseClone.js

@@ -118,9 +118,7 @@ function baseClone(value, isDeep, isFull, customizer, key, object, stack) {
   }
   stack.set(value, result);
 
-  if (!isArr) {
+  var props = isArr ? undefined : (isFull ? getAllKeys : keys)(value);
-    var props = isFull ? getAllKeys(value) : keys(value);
-  }
   arrayEach(props || value, function(subValue, key) {
     if (props) {
       key = subValue;

_baseCreate.js

@@ -20,7 +20,7 @@ var baseCreate = (function() {
     if (objectCreate) {
       return objectCreate(proto);
     }
-    object.prototype = prototype;
+    object.prototype = proto;
     var result = new object;
     object.prototype = undefined;
     return result;

_baseDifference.js

@@ -45,7 +45,7 @@ function baseDifference(array, values, iteratee, comparator) {
   outer:
   while (++index < length) {
     var value = array[index],
-        computed = iteratee ? iteratee(value) : value;
+        computed = iteratee == null ? value : iteratee(value);
 
     value = (comparator || value !== 0) ? value : 0;
     if (isCommon && computed === computed) {

_baseGetTag.js

@@ -1,22 +1,29 @@
-/** Used for built-in method references. */
+import Symbol from './_Symbol.js';
-var objectProto = Object.prototype;
+import getRawTag from './_getRawTag.js';
+import objectToString from './_objectToString.js';
+
+/** `Object#toString` result references. */
+var nullTag = '[object Null]',
+    undefinedTag = '[object Undefined]';
+
+/** Built-in value references. */
+var symToStringTag = Symbol ? Symbol.toStringTag : undefined;
 
 /**
- * Used to resolve the
+ * The base implementation of `getTag` without fallbacks for buggy environments.
- * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#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);
+  if (value == null) {
+    return value === undefined ? undefinedTag : nullTag;
+  }
+  value = Object(value);
+  return (symToStringTag && symToStringTag in value)
+    ? getRawTag(value)
+    : objectToString(value);
 }
 
 export default baseGetTag;

_baseIsArguments.js

@@ -0,0 +1,18 @@
+import baseGetTag from './_baseGetTag.js';
+import isObjectLike from './isObjectLike.js';
+
+/** `Object#toString` result references. */
+var argsTag = '[object Arguments]';
+
+/**
+ * The base implementation of `_.isArguments`.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is an `arguments` object,
+ */
+function baseIsArguments(value) {
+  return isObjectLike(value) && baseGetTag(value) == argsTag;
+}
+
+export default baseIsArguments;

_baseIsArrayBuffer.js

@@ -1,17 +1,8 @@
+import baseGetTag from './_baseGetTag.js';
 import isObjectLike from './isObjectLike.js';
 
 var arrayBufferTag = '[object ArrayBuffer]';
 
-/** Used for built-in method references. */
-var objectProto = Object.prototype;
-
-/**
- * Used to resolve the
- * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
- * of values.
- */
-var objectToString = objectProto.toString;
-
 /**
  * The base implementation of `_.isArrayBuffer` without Node.js optimizations.
  *
@@ -20,7 +11,7 @@ var objectToString = objectProto.toString;
  * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
  */
 function baseIsArrayBuffer(value) {
-  return isObjectLike(value) && objectToString.call(value) == arrayBufferTag;
+  return isObjectLike(value) && baseGetTag(value) == arrayBufferTag;
 }
 
 export default baseIsArrayBuffer;

_baseIsDate.js

@@ -1,18 +1,9 @@
+import baseGetTag from './_baseGetTag.js';
 import isObjectLike from './isObjectLike.js';
 
 /** `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-262/7.0/#sec-object.prototype.tostring)
- * of values.
- */
-var objectToString = objectProto.toString;
-
 /**
  * The base implementation of `_.isDate` without Node.js optimizations.
  *
@@ -21,7 +12,7 @@ var objectToString = objectProto.toString;
  * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
  */
 function baseIsDate(value) {
-  return isObjectLike(value) && objectToString.call(value) == dateTag;
+  return isObjectLike(value) && baseGetTag(value) == dateTag;
 }
 
 export default baseIsDate;

_baseIsEqualDeep.js

@@ -4,6 +4,7 @@ import equalByTag from './_equalByTag.js';
 import equalObjects from './_equalObjects.js';
 import getTag from './_getTag.js';
 import isArray from './isArray.js';
+import isBuffer from './isBuffer.js';
 import isTypedArray from './isTypedArray.js';
 
 /** Used to compose bitmasks for comparison styles. */
@@ -53,6 +54,13 @@ function baseIsEqualDeep(object, other, equalFunc, customizer, bitmask, stack) {
       othIsObj = othTag == objectTag,
       isSameTag = objTag == othTag;
 
+  if (isSameTag && isBuffer(object)) {
+    if (!isBuffer(other)) {
+      return false;
+    }
+    objIsArr = true;
+    objIsObj = false;
+  }
   if (isSameTag && !objIsObj) {
     stack || (stack = new Stack);
     return (objIsArr || isTypedArray(object))

_baseIsRegExp.js

@@ -1,18 +1,9 @@
-import isObject from './isObject.js';
+import baseGetTag from './_baseGetTag.js';
+import isObjectLike from './isObjectLike.js';
 
 /** `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-262/7.0/#sec-object.prototype.tostring)
- * of values.
- */
-var objectToString = objectProto.toString;
-
 /**
  * The base implementation of `_.isRegExp` without Node.js optimizations.
  *
@@ -21,7 +12,7 @@ var objectToString = objectProto.toString;
  * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
  */
 function baseIsRegExp(value) {
-  return isObject(value) && objectToString.call(value) == regexpTag;
+  return isObjectLike(value) && baseGetTag(value) == regexpTag;
 }
 
 export default baseIsRegExp;

_baseIsTypedArray.js

@@ -1,3 +1,4 @@
+import baseGetTag from './_baseGetTag.js';
 import isLength from './isLength.js';
 import isObjectLike from './isObjectLike.js';
 
@@ -44,16 +45,6 @@ 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-262/7.0/#sec-object.prototype.tostring)
- * of values.
- */
-var objectToString = objectProto.toString;
-
 /**
  * The base implementation of `_.isTypedArray` without Node.js optimizations.
  *
@@ -63,7 +54,7 @@ var objectToString = objectProto.toString;
  */
 function baseIsTypedArray(value) {
   return isObjectLike(value) &&
-    isLength(value.length) && !!typedArrayTags[objectToString.call(value)];
+    isLength(value.length) && !!typedArrayTags[baseGetTag(value)];
 }
 
 export default baseIsTypedArray;

_baseMean.js

@@ -13,7 +13,7 @@ var NAN = 0 / 0;
  * @returns {number} Returns the mean.
  */
 function baseMean(array, iteratee) {
-  var length = array ? array.length : 0;
+  var length = array == null ? 0 : array.length;
   return length ? (baseSum(array, iteratee) / length) : NAN;
 }
 

_baseMerge.js

@@ -1,11 +1,9 @@
 import Stack from './_Stack.js';
-import arrayEach from './_arrayEach.js';
 import assignMergeValue from './_assignMergeValue.js';
-import baseKeysIn from './_baseKeysIn.js';
+import baseFor from './_baseFor.js';
 import baseMergeDeep from './_baseMergeDeep.js';
-import isArray from './isArray.js';
 import isObject from './isObject.js';
-import isTypedArray from './isTypedArray.js';
+import keysIn from './keysIn.js';
 
 /**
  * The base implementation of `_.merge` without support for multiple sources.
@@ -22,14 +20,7 @@ function baseMerge(object, source, srcIndex, customizer, stack) {
   if (object === source) {
     return;
   }
-  if (!(isArray(source) || isTypedArray(source))) {
+  baseFor(source, function(srcValue, key) {
-    var props = baseKeysIn(source);
-  }
-  arrayEach(props || source, function(srcValue, key) {
-    if (props) {
-      key = srcValue;
-      srcValue = source[key];
-    }
     if (isObject(srcValue)) {
       stack || (stack = new Stack);
       baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
@@ -44,7 +35,7 @@ function baseMerge(object, source, srcIndex, customizer, stack) {
       }
       assignMergeValue(object, key, newValue);
     }
-  });
+  }, keysIn);
 }
 
 export default baseMerge;

_baseMergeDeep.js

@@ -1,9 +1,12 @@
 import assignMergeValue from './_assignMergeValue.js';
-import baseClone from './_baseClone.js';
+import cloneBuffer from './_cloneBuffer.js';
+import cloneTypedArray from './_cloneTypedArray.js';
 import copyArray from './_copyArray.js';
+import initCloneObject from './_initCloneObject.js';
 import isArguments from './isArguments.js';
 import isArray from './isArray.js';
 import isArrayLikeObject from './isArrayLikeObject.js';
+import isBuffer from './isBuffer.js';
 import isFunction from './isFunction.js';
 import isObject from './isObject.js';
 import isPlainObject from './isPlainObject.js';
@@ -41,29 +44,37 @@ function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, sta
   var isCommon = newValue === undefined;
 
   if (isCommon) {
+    var isArr = isArray(srcValue),
+        isBuff = !isArr && isBuffer(srcValue),
+        isTyped = !isArr && !isBuff && isTypedArray(srcValue);
+
     newValue = srcValue;
-    if (isArray(srcValue) || isTypedArray(srcValue)) {
+    if (isArr || isBuff || isTyped) {
       if (isArray(objValue)) {
         newValue = objValue;
       }
       else if (isArrayLikeObject(objValue)) {
         newValue = copyArray(objValue);
       }
-      else {
+      else if (isBuff) {
         isCommon = false;
-        newValue = baseClone(srcValue, true);
+        newValue = cloneBuffer(srcValue, true);
+      }
+      else if (isTyped) {
+        isCommon = false;
+        newValue = cloneTypedArray(srcValue, true);
+      }
+      else {
+        newValue = [];
       }
     }
     else if (isPlainObject(srcValue) || isArguments(srcValue)) {
+      newValue = objValue;
       if (isArguments(objValue)) {
         newValue = toPlainObject(objValue);
       }
       else if (!isObject(objValue) || (srcIndex && isFunction(objValue))) {
-        isCommon = false;
+        newValue = initCloneObject(srcValue);
-        newValue = baseClone(srcValue, true);
-      }
-      else {
-        newValue = objValue;
       }
     }
     else {

_baseSampleSize.js

@@ -1,3 +1,4 @@
+import baseClamp from './_baseClamp.js';
 import shuffleSelf from './_shuffleSelf.js';
 import values from './values.js';
 
@@ -10,7 +11,8 @@ import values from './values.js';
  * @returns {Array} Returns the random elements.
  */
 function baseSampleSize(collection, n) {
-  return shuffleSelf(values(collection), n);
+  var array = values(collection);
+  return shuffleSelf(array, baseClamp(n, 0, array.length));
 }
 
 export default baseSampleSize;

_baseSetToString.js

@@ -1,6 +1,6 @@
 import constant from './constant.js';
+import defineProperty from './_defineProperty.js';
 import identity from './identity.js';
-import nativeDefineProperty from './_nativeDefineProperty.js';
 
 /**
  * The base implementation of `setToString` without support for hot loop shorting.
@@ -10,8 +10,8 @@ import nativeDefineProperty from './_nativeDefineProperty.js';
  * @param {Function} string The `toString` result.
  * @returns {Function} Returns `func`.
  */
-var baseSetToString = !nativeDefineProperty ? identity : function(func, string) {
+var baseSetToString = !defineProperty ? identity : function(func, string) {
-  return nativeDefineProperty(func, 'toString', {
+  return defineProperty(func, 'toString', {
     'configurable': true,
     'enumerable': false,
     'value': constant(string),

_baseSortedIndex.js

@@ -20,7 +20,7 @@ var MAX_ARRAY_LENGTH = 4294967295,
  */
 function baseSortedIndex(array, value, retHighest) {
   var low = 0,
-      high = array ? array.length : low;
+      high = array == null ? low : array.length;
 
   if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) {
     while (low < high) {

_baseSortedIndexBy.js

@@ -25,7 +25,7 @@ function baseSortedIndexBy(array, value, iteratee, retHighest) {
   value = iteratee(value);
 
   var low = 0,
-      high = array ? array.length : 0,
+      high = array == null ? 0 : array.length,
       valIsNaN = value !== value,
       valIsNull = value === null,
       valIsSymbol = isSymbol(value),

_baseToString.js

@@ -1,4 +1,6 @@
 import Symbol from './_Symbol.js';
+import arrayMap from './_arrayMap.js';
+import isArray from './isArray.js';
 import isSymbol from './isSymbol.js';
 
 /** Used as references for various `Number` constants. */
@@ -21,6 +23,10 @@ function baseToString(value) {
   if (typeof value == 'string') {
     return value;
   }
+  if (isArray(value)) {
+    // Recursively convert values (susceptible to call stack limits).
+    return arrayMap(value, baseToString) + '';
+  }
   if (isSymbol(value)) {
     return symbolToString ? symbolToString.call(value) : '';
   }

_baseXor.js

@@ -1,5 +1,5 @@
-import arrayPush from './_arrayPush.js';
 import baseDifference from './_baseDifference.js';
+import baseFlatten from './_baseFlatten.js';
 import baseUniq from './_baseUniq.js';
 
 /**
@@ -13,18 +13,25 @@ import baseUniq from './_baseUniq.js';
  * @returns {Array} Returns the new array of values.
  */
 function baseXor(arrays, iteratee, comparator) {
+  var length = arrays.length;
+  if (length < 2) {
+    return length ? baseUniq(arrays[0]) : [];
+  }
   var index = -1,
-      length = arrays.length;
+      result = Array(length);
 
   while (++index < length) {
-    var result = result
+    var array = arrays[index],
-      ? arrayPush(
+        othIndex = -1;
-          baseDifference(result, arrays[index], iteratee, comparator),
+
-          baseDifference(arrays[index], result, iteratee, comparator)
+    while (++othIndex < length) {
-        )
+      var othArray = arrays[othIndex];
-      : arrays[index];
+      if (othArray !== array) {
+        result[index] = baseDifference(result[index] || array, othArray, iteratee, comparator);
+      }
+    }
   }
-  return (result && result.length) ? baseUniq(result, iteratee, comparator) : [];
+  return baseUniq(baseFlatten(result, 1), iteratee, comparator);
 }
 
 export default baseXor;

_defineProperty.js

@@ -0,0 +1,11 @@
+import getNative from './_getNative.js';
+
+var defineProperty = (function() {
+  try {
+    var func = getNative(Object, 'defineProperty');
+    func({}, '', {});
+    return func;
+  } catch (e) {}
+}());
+
+export default defineProperty;

_getRawTag.js

@@ -0,0 +1,46 @@
+import Symbol from './_Symbol.js';
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
+/**
+ * Used to resolve the
+ * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
+ * of values.
+ */
+var nativeObjectToString = objectProto.toString;
+
+/** Built-in value references. */
+var symToStringTag = Symbol ? Symbol.toStringTag : undefined;
+
+/**
+ * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.
+ *
+ * @private
+ * @param {*} value The value to query.
+ * @returns {string} Returns the raw `toStringTag`.
+ */
+function getRawTag(value) {
+  var isOwn = hasOwnProperty.call(value, symToStringTag),
+      tag = value[symToStringTag];
+
+  try {
+    value[symToStringTag] = undefined;
+    var unmasked = true;
+  } catch (e) {}
+
+  var result = nativeObjectToString.call(value);
+  if (unmasked) {
+    if (isOwn) {
+      value[symToStringTag] = tag;
+    } else {
+      delete value[symToStringTag];
+    }
+  }
+  return result;
+}
+
+export default getRawTag;

_getTag.js

@@ -15,16 +15,6 @@ var mapTag = '[object Map]',
 
 var dataViewTag = '[object DataView]';
 
-/** Used for built-in method references. */
-var objectProto = Object.prototype;
-
-/**
- * Used to resolve the
- * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
- * of values.
- */
-var objectToString = objectProto.toString;
-
 /** Used to detect maps, sets, and weakmaps. */
 var dataViewCtorString = toSource(DataView),
     mapCtorString = toSource(Map),
@@ -48,9 +38,9 @@ if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
     (Set && getTag(new Set) != setTag) ||
     (WeakMap && getTag(new WeakMap) != weakMapTag)) {
   getTag = function(value) {
-    var result = objectToString.call(value),
+    var result = baseGetTag(value),
         Ctor = result == objectTag ? value.constructor : undefined,
-        ctorString = Ctor ? toSource(Ctor) : undefined;
+        ctorString = Ctor ? toSource(Ctor) : '';
 
     if (ctorString) {
       switch (ctorString) {

_hasPath.js

@@ -32,7 +32,7 @@ function hasPath(object, path, hasFunc) {
   if (result || ++index != length) {
     return result;
   }
-  length = object ? object.length : 0;
+  length = object == null ? 0 : object.length;
   return !!length && isLength(length) && isIndex(key, length) &&
     (isArray(object) || isArguments(object));
 }

_nativeDefineProperty.js

@@ -1,6 +0,0 @@
-import getNative from './_getNative.js';
-
-/* Built-in method references that are verified to be native. */
-var nativeDefineProperty = getNative(Object, 'defineProperty');
-
-export default nativeDefineProperty;

_objectToString.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-262/7.0/#sec-object.prototype.tostring)
+ * of values.
+ */
+var nativeObjectToString = objectProto.toString;
+
+/**
+ * Converts `value` to a string using `Object.prototype.toString`.
+ *
+ * @private
+ * @param {*} value The value to convert.
+ * @returns {string} Returns the converted string.
+ */
+function objectToString(value) {
+  return nativeObjectToString.call(value);
+}
+
+export default objectToString;

_shortOut.js

@@ -1,5 +1,5 @@
 /** Used to detect hot functions by number of calls within a span of milliseconds. */
-var HOT_COUNT = 500,
+var HOT_COUNT = 800,
     HOT_SPAN = 16;
 
 /* Built-in method references for those with the same name as other `lodash` methods. */

_shuffleSelf.js

@@ -1,4 +1,3 @@
-import baseClamp from './_baseClamp.js';
 import baseRandom from './_baseRandom.js';
 
 /**
@@ -14,7 +13,7 @@ function shuffleSelf(array, size) {
       length = array.length,
       lastIndex = length - 1;
 
-  size = size === undefined ? length : baseClamp(size, 0, length);
+  size = size === undefined ? length : size;
   while (++index < size) {
     var rand = baseRandom(index, lastIndex),
         value = array[rand];

_toSource.js

@@ -8,7 +8,7 @@ var funcToString = funcProto.toString;
  * Converts `func` to its source code.
  *
  * @private
- * @param {Function} func The function to process.
+ * @param {Function} func The function to convert.
  * @returns {string} Returns the source code.
  */
 function toSource(func) {

_unicodeWords.js

@@ -29,22 +29,26 @@ var rsApos = "['\u2019]",
     rsZWJ = '\\u200d';
 
 /** Used to compose unicode regexes. */
-var rsLowerMisc = '(?:' + rsLower + '|' + rsMisc + ')',
+var rsMiscLower = '(?:' + rsLower + '|' + rsMisc + ')',
-    rsUpperMisc = '(?:' + rsUpper + '|' + rsMisc + ')',
+    rsMiscUpper = '(?:' + rsUpper + '|' + rsMisc + ')',
-    rsOptLowerContr = '(?:' + rsApos + '(?:d|ll|m|re|s|t|ve))?',
+    rsOptContrLower = '(?:' + rsApos + '(?:d|ll|m|re|s|t|ve))?',
-    rsOptUpperContr = '(?:' + rsApos + '(?:D|LL|M|RE|S|T|VE))?',
+    rsOptContrUpper = '(?:' + rsApos + '(?:D|LL|M|RE|S|T|VE))?',
     reOptMod = rsModifier + '?',
     rsOptVar = '[' + rsVarRange + ']?',
     rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*',
+    rsOrdLower = '\\d*(?:(?:1st|2nd|3rd|(?![123])\\dth)\\b)',
+    rsOrdUpper = '\\d*(?:(?:1ST|2ND|3RD|(?![123])\\dTH)\\b)',
     rsSeq = rsOptVar + reOptMod + rsOptJoin,
     rsEmoji = '(?:' + [rsDingbat, rsRegional, rsSurrPair].join('|') + ')' + rsSeq;
 
 /** Used to match complex or compound words. */
 var reUnicodeWord = RegExp([
-  rsUpper + '?' + rsLower + '+' + rsOptLowerContr + '(?=' + [rsBreak, rsUpper, '$'].join('|') + ')',
+  rsUpper + '?' + rsLower + '+' + rsOptContrLower + '(?=' + [rsBreak, rsUpper, '$'].join('|') + ')',
-  rsUpperMisc + '+' + rsOptUpperContr + '(?=' + [rsBreak, rsUpper + rsLowerMisc, '$'].join('|') + ')',
+  rsMiscUpper + '+' + rsOptContrUpper + '(?=' + [rsBreak, rsUpper + rsMiscLower, '$'].join('|') + ')',
-  rsUpper + '?' + rsLowerMisc + '+' + rsOptLowerContr,
+  rsUpper + '?' + rsMiscLower + '+' + rsOptContrLower,
-  rsUpper + '+' + rsOptUpperContr,
+  rsUpper + '+' + rsOptContrUpper,
+  rsOrdUpper,
+  rsOrdLower,
   rsDigits,
   rsEmoji
 ].join('|'), 'g');

chunk.js

@@ -33,7 +33,7 @@ function chunk(array, size, guard) {
   } else {
     size = nativeMax(toInteger(size), 0);
   }
-  var length = array ? array.length : 0;
+  var length = array == null ? 0 : array.length;
   if (!length || size < 1) {
     return [];
   }

cloneDeepWith.js

@@ -29,6 +29,7 @@ import baseClone from './_baseClone.js';
  * // => 20
  */
 function cloneDeepWith(value, customizer) {
+  customizer = typeof customizer == 'function' ? customizer : undefined;
   return baseClone(value, true, true, customizer);
 }
 

cloneWith.js

@@ -32,6 +32,7 @@ import baseClone from './_baseClone.js';
  * // => 0
  */
 function cloneWith(value, customizer) {
+  customizer = typeof customizer == 'function' ? customizer : undefined;
   return baseClone(value, false, true, customizer);
 }
 

compact.js

@@ -15,7 +15,7 @@
  */
 function compact(array) {
   var index = -1,
-      length = array ? array.length : 0,
+      length = array == null ? 0 : array.length,
       resIndex = 0,
       result = [];
 

cond.js

@@ -36,7 +36,7 @@ var FUNC_ERROR_TEXT = 'Expected a function';
  * // => 'no match'
  */
 function cond(pairs) {
-  var length = pairs ? pairs.length : 0,
+  var length = pairs == null ? 0 : pairs.length,
       toIteratee = baseIteratee;
 
   pairs = !length ? [] : arrayMap(pairs, function(pair) {

countBy.js

@@ -18,8 +18,7 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * @since 0.5.0
  * @category Collection
  * @param {Array|Object} collection The collection to iterate over.
- * @param {Function} [iteratee=_.identity]
+ * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
- *  The iteratee to transform keys.
  * @returns {Object} Returns the composed aggregate object.
  * @example
  *

create.js

@@ -37,7 +37,7 @@ import baseCreate from './_baseCreate.js';
  */
 function create(prototype, properties) {
   var result = baseCreate(prototype);
-  return properties ? baseAssign(result, properties) : result;
+  return properties == null ? result : baseAssign(result, properties);
 }
 
 export default create;

drop.js

@@ -27,7 +27,7 @@ import toInteger from './toInteger.js';
  * // => [1, 2, 3]
  */
 function drop(array, n, guard) {
-  var length = array ? array.length : 0;
+  var length = array == null ? 0 : array.length;
   if (!length) {
     return [];
   }

dropRight.js

@@ -27,7 +27,7 @@ import toInteger from './toInteger.js';
  * // => [1, 2, 3]
  */
 function dropRight(array, n, guard) {
-  var length = array ? array.length : 0;
+  var length = array == null ? 0 : array.length;
   if (!length) {
     return [];
   }

dropWhile.js

@@ -11,8 +11,7 @@ import baseWhile from './_baseWhile.js';
  * @since 3.0.0
  * @category Array
  * @param {Array} array The array to query.
- * @param {Function} [predicate=_.identity]
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
- *  The function invoked per iteration.
  * @returns {Array} Returns the slice of `array`.
  * @example
  *

every.js

@@ -19,8 +19,7 @@ import isIterateeCall from './_isIterateeCall.js';
  * @since 0.1.0
  * @category Collection
  * @param {Array|Object} collection The collection to iterate over.
- * @param {Function} [predicate=_.identity]
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
- *  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,
  *  else `false`.

fill.js

@@ -31,7 +31,7 @@ import isIterateeCall from './_isIterateeCall.js';
  * // => [4, '*', '*', 10]
  */
 function fill(array, value, start, end) {
-  var length = array ? array.length : 0;
+  var length = array == null ? 0 : array.length;
   if (!length) {
     return [];
   }

filter.js

@@ -15,8 +15,7 @@ import isArray from './isArray.js';
  * @since 0.1.0
  * @category Collection
  * @param {Array|Object} collection The collection to iterate over.
- * @param {Function} [predicate=_.identity]
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
- *  The function invoked per iteration.
  * @returns {Array} Returns the new filtered array.
  * @see _.reject
  * @example

find.js

@@ -11,8 +11,7 @@ import findIndex from './findIndex.js';
  * @since 0.1.0
  * @category Collection
  * @param {Array|Object} collection The collection to inspect.
- * @param {Function} [predicate=_.identity]
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
- *  The function invoked per iteration.
  * @param {number} [fromIndex=0] The index to search from.
  * @returns {*} Returns the matched element, else `undefined`.
  * @example

findIndex.js

@@ -14,8 +14,7 @@ var nativeMax = Math.max;
  * @since 1.1.0
  * @category Array
  * @param {Array} array The array to inspect.
- * @param {Function} [predicate=_.identity]
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
- *  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`.
  * @example
@@ -42,7 +41,7 @@ var nativeMax = Math.max;
  * // => 2
  */
 function findIndex(array, predicate, fromIndex) {
-  var length = array ? array.length : 0;
+  var length = array == null ? 0 : array.length;
   if (!length) {
     return -1;
   }

findLast.js

@@ -10,8 +10,7 @@ import findLastIndex from './findLastIndex.js';
  * @since 2.0.0
  * @category Collection
  * @param {Array|Object} collection The collection to inspect.
- * @param {Function} [predicate=_.identity]
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
- *  The function invoked per iteration.
  * @param {number} [fromIndex=collection.length-1] The index to search from.
  * @returns {*} Returns the matched element, else `undefined`.
  * @example

findLastIndex.js

@@ -15,8 +15,7 @@ var nativeMax = Math.max,
  * @since 2.0.0
  * @category Array
  * @param {Array} array The array to inspect.
- * @param {Function} [predicate=_.identity]
+ * @param {Function} [predicate=_.identity] The function invoked per iteration.
- *  The function invoked per iteration.
  * @param {number} [fromIndex=array.length-1] The index to search from.
  * @returns {number} Returns the index of the found element, else `-1`.
  * @example
@@ -43,7 +42,7 @@ var nativeMax = Math.max,
  * // => 0
  */
 function findLastIndex(array, predicate, fromIndex) {
-  var length = array ? array.length : 0;
+  var length = array == null ? 0 : array.length;
   if (!length) {
     return -1;
   }

flatMap.js

@@ -11,8 +11,7 @@ import map from './map.js';
  * @since 4.0.0
  * @category Collection
  * @param {Array|Object} collection The collection to iterate over.
- * @param {Function} [iteratee=_.identity]
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
- *  The function invoked per iteration.
  * @returns {Array} Returns the new flattened array.
  * @example
  *

flatMapDeep.js

@@ -13,8 +13,7 @@ var INFINITY = 1 / 0;
  * @since 4.7.0
  * @category Collection
  * @param {Array|Object} collection The collection to iterate over.
- * @param {Function} [iteratee=_.identity]
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
- *  The function invoked per iteration.
  * @returns {Array} Returns the new flattened array.
  * @example
  *

flatMapDepth.js

@@ -11,8 +11,7 @@ import toInteger from './toInteger.js';
  * @since 4.7.0
  * @category Collection
  * @param {Array|Object} collection The collection to iterate over.
- * @param {Function} [iteratee=_.identity]
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
- *  The function invoked per iteration.
  * @param {number} [depth=1] The maximum recursion depth.
  * @returns {Array} Returns the new flattened array.
  * @example

flatten.js

@@ -15,7 +15,7 @@ import baseFlatten from './_baseFlatten.js';
  * // => [1, 2, [3, [4]], 5]
  */
 function flatten(array) {
-  var length = array ? array.length : 0;
+  var length = array == null ? 0 : array.length;
   return length ? baseFlatten(array, 1) : [];
 }
 

flattenDeep.js

@@ -18,7 +18,7 @@ var INFINITY = 1 / 0;
  * // => [1, 2, 3, 4, 5]
  */
 function flattenDeep(array) {
-  var length = array ? array.length : 0;
+  var length = array == null ? 0 : array.length;
   return length ? baseFlatten(array, INFINITY) : [];
 }
 

flattenDepth.js

@@ -22,7 +22,7 @@ import toInteger from './toInteger.js';
  * // => [1, 2, 3, [4], 5]
  */
 function flattenDepth(array, depth) {
-  var length = array ? array.length : 0;
+  var length = array == null ? 0 : array.length;
   if (!length) {
     return [];
   }

forEach.js

@@ -1,6 +1,6 @@
 import arrayEach from './_arrayEach.js';
 import baseEach from './_baseEach.js';
-import baseIteratee from './_baseIteratee.js';
+import castFunction from './_castFunction.js';
 import isArray from './isArray.js';
 
 /**
@@ -35,7 +35,7 @@ import isArray from './isArray.js';
  */
 function forEach(collection, iteratee) {
   var func = isArray(collection) ? arrayEach : baseEach;
-  return func(collection, baseIteratee(iteratee, 3));
+  return func(collection, castFunction(iteratee));
 }
 
 export default forEach;

forEachRight.js

@@ -1,6 +1,6 @@
 import arrayEachRight from './_arrayEachRight.js';
 import baseEachRight from './_baseEachRight.js';
-import baseIteratee from './_baseIteratee.js';
+import castFunction from './_castFunction.js';
 import isArray from './isArray.js';
 
 /**
@@ -25,7 +25,7 @@ import isArray from './isArray.js';
  */
 function forEachRight(collection, iteratee) {
   var func = isArray(collection) ? arrayEachRight : baseEachRight;
-  return func(collection, baseIteratee(iteratee, 3));
+  return func(collection, castFunction(iteratee));
 }
 
 export default forEachRight;

forIn.js

@@ -1,5 +1,5 @@
 import baseFor from './_baseFor.js';
-import baseIteratee from './_baseIteratee.js';
+import castFunction from './_castFunction.js';
 import keysIn from './keysIn.js';
 
 /**
@@ -33,7 +33,7 @@ import keysIn from './keysIn.js';
 function forIn(object, iteratee) {
   return object == null
     ? object
-    : baseFor(object, baseIteratee(iteratee, 3), keysIn);
+    : baseFor(object, castFunction(iteratee), keysIn);
 }
 
 export default forIn;

forInRight.js

@@ -1,5 +1,5 @@
 import baseForRight from './_baseForRight.js';
-import baseIteratee from './_baseIteratee.js';
+import castFunction from './_castFunction.js';
 import keysIn from './keysIn.js';
 
 /**
@@ -31,7 +31,7 @@ import keysIn from './keysIn.js';
 function forInRight(object, iteratee) {
   return object == null
     ? object
-    : baseForRight(object, baseIteratee(iteratee, 3), keysIn);
+    : baseForRight(object, castFunction(iteratee), keysIn);
 }
 
 export default forInRight;

forOwn.js

@@ -1,5 +1,5 @@
 import baseForOwn from './_baseForOwn.js';
-import baseIteratee from './_baseIteratee.js';
+import castFunction from './_castFunction.js';
 
 /**
  * Iterates over own enumerable string keyed properties of an object and
@@ -30,7 +30,7 @@ import baseIteratee from './_baseIteratee.js';
  * // => Logs 'a' then 'b' (iteration order is not guaranteed).
  */
 function forOwn(object, iteratee) {
-  return object && baseForOwn(object, baseIteratee(iteratee, 3));
+  return object && baseForOwn(object, castFunction(iteratee));
 }
 
 export default forOwn;

forOwnRight.js

@@ -1,5 +1,5 @@
 import baseForOwnRight from './_baseForOwnRight.js';
-import baseIteratee from './_baseIteratee.js';
+import castFunction from './_castFunction.js';
 
 /**
  * This method is like `_.forOwn` except that it iterates over properties of
@@ -28,7 +28,7 @@ import baseIteratee from './_baseIteratee.js';
  * // => Logs 'b' then 'a' assuming `_.forOwn` logs 'a' then 'b'.
  */
 function forOwnRight(object, iteratee) {
-  return object && baseForOwnRight(object, baseIteratee(iteratee, 3));
+  return object && baseForOwnRight(object, castFunction(iteratee));
 }
 
 export default forOwnRight;

fromPairs.js

@@ -15,7 +15,7 @@
  */
 function fromPairs(pairs) {
   var index = -1,
-      length = pairs ? pairs.length : 0,
+      length = pairs == null ? 0 : pairs.length,
       result = {};
 
   while (++index < length) {

groupBy.js

@@ -19,8 +19,7 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * @since 0.1.0
  * @category Collection
  * @param {Array|Object} collection The collection to iterate over.
- * @param {Function} [iteratee=_.identity]
+ * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
- *  The iteratee to transform keys.
  * @returns {Object} Returns the composed aggregate object.
  * @example
  *

indexOf.js

@@ -28,7 +28,7 @@ var nativeMax = Math.max;
  * // => 3
  */
 function indexOf(array, value, fromIndex) {
-  var length = array ? array.length : 0;
+  var length = array == null ? 0 : array.length;
   if (!length) {
     return -1;
   }

initial.js

@@ -15,7 +15,7 @@ import baseSlice from './_baseSlice.js';
  * // => [1, 2]
  */
 function initial(array) {
-  var length = array ? array.length : 0;
+  var length = array == null ? 0 : array.length;
   return length ? baseSlice(array, 0, -1) : [];
 }
 

intersectionWith.js

@@ -29,9 +29,8 @@ var intersectionWith = baseRest(function(arrays) {
   var comparator = last(arrays),
       mapped = arrayMap(arrays, castArrayLikeObject);
 
-  if (comparator === last(mapped)) {
+  comparator = typeof comparator == 'function' ? comparator : undefined;
-    comparator = undefined;
+  if (comparator) {
-  } else {
     mapped.pop();
   }
   return (mapped.length && mapped[0] === arrays[0])

isArguments.js

@@ -1,7 +1,5 @@
-import isArrayLikeObject from './isArrayLikeObject.js';
+import baseIsArguments from './_baseIsArguments.js';
-
+import isObjectLike from './isObjectLike.js';
-/** `Object#toString` result references. */
-var argsTag = '[object Arguments]';
 
 /** Used for built-in method references. */
 var objectProto = Object.prototype;
@@ -9,13 +7,6 @@ var objectProto = Object.prototype;
 /** Used to check objects for own properties. */
 var hasOwnProperty = objectProto.hasOwnProperty;
 
-/**
- * Used to resolve the
- * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
- * of values.
- */
-var objectToString = objectProto.toString;
-
 /** Built-in value references. */
 var propertyIsEnumerable = objectProto.propertyIsEnumerable;
 
@@ -37,10 +28,9 @@ var propertyIsEnumerable = objectProto.propertyIsEnumerable;
  * _.isArguments([1, 2, 3]);
  * // => false
  */
-function isArguments(value) {
+var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {
-  // Safari 8.1 makes `arguments.callee` enumerable in strict mode.
+  return isObjectLike(value) && hasOwnProperty.call(value, 'callee') &&
-  return isArrayLikeObject(value) && hasOwnProperty.call(value, 'callee') &&
+    !propertyIsEnumerable.call(value, 'callee');
-    (!propertyIsEnumerable.call(value, 'callee') || objectToString.call(value) == argsTag);
+};
-}
 
 export default isArguments;

isBoolean.js

@@ -1,18 +1,9 @@
+import baseGetTag from './_baseGetTag.js';
 import isObjectLike from './isObjectLike.js';
 
 /** `Object#toString` result references. */
 var boolTag = '[object Boolean]';
 
-/** Used for built-in method references. */
-var objectProto = Object.prototype;
-
-/**
- * Used to resolve the
- * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
- * of values.
- */
-var objectToString = objectProto.toString;
-
 /**
  * Checks if `value` is classified as a boolean primitive or object.
  *
@@ -32,7 +23,7 @@ var objectToString = objectProto.toString;
  */
 function isBoolean(value) {
   return value === true || value === false ||
-    (isObjectLike(value) && objectToString.call(value) == boolTag);
+    (isObjectLike(value) && baseGetTag(value) == boolTag);
 }
 
 export default isBoolean;

isElement.js

@@ -19,7 +19,7 @@ import isPlainObject from './isPlainObject.js';
  * // => false
  */
 function isElement(value) {
-  return value != null && value.nodeType === 1 && isObjectLike(value) && !isPlainObject(value);
+  return isObjectLike(value) && value.nodeType === 1 && !isPlainObject(value);
 }
 
 export default isElement;

isEmpty.js

@@ -1,10 +1,11 @@
+import baseKeys from './_baseKeys.js';
 import getTag from './_getTag.js';
 import isArguments from './isArguments.js';
 import isArray from './isArray.js';
 import isArrayLike from './isArrayLike.js';
 import isBuffer from './isBuffer.js';
 import isPrototype from './_isPrototype.js';
-import nativeKeys from './_nativeKeys.js';
+import isTypedArray from './isTypedArray.js';
 
 /** `Object#toString` result references. */
 var mapTag = '[object Map]',
@@ -50,9 +51,12 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * // => false
  */
 function isEmpty(value) {
+  if (value == null) {
+    return true;
+  }
   if (isArrayLike(value) &&
-      (isArray(value) || typeof value == 'string' ||
+      (isArray(value) || typeof value == 'string' || typeof value.splice == 'function' ||
-        typeof value.splice == 'function' || isBuffer(value) || isArguments(value))) {
+        isBuffer(value) || isTypedArray(value) || isArguments(value))) {
     return !value.length;
   }
   var tag = getTag(value);
@@ -60,7 +64,7 @@ function isEmpty(value) {
     return !value.size;
   }
   if (isPrototype(value)) {
-    return !nativeKeys(value).length;
+    return !baseKeys(value).length;
   }
   for (var key in value) {
     if (hasOwnProperty.call(value, key)) {

isError.js

@@ -1,17 +1,10 @@
+import baseGetTag from './_baseGetTag.js';
 import isObjectLike from './isObjectLike.js';
+import isPlainObject from './isPlainObject.js';
 
 /** `Object#toString` result references. */
-var errorTag = '[object Error]';
+var domExcTag = '[object DOMException]',
-
+    errorTag = '[object Error]';
-/** Used for built-in method references. */
-var objectProto = Object.prototype;
-
-/**
- * Used to resolve the
- * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
- * of values.
- */
-var objectToString = objectProto.toString;
 
 /**
  * Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`,
@@ -35,8 +28,9 @@ function isError(value) {
   if (!isObjectLike(value)) {
     return false;
   }
-  return (objectToString.call(value) == errorTag) ||
+  var tag = baseGetTag(value);
-    (typeof value.message == 'string' && typeof value.name == 'string');
+  return tag == errorTag || tag == domExcTag ||
+    (typeof value.message == 'string' && typeof value.name == 'string' && !isPlainObject(value));
 }
 
 export default isError;

isFunction.js

@@ -1,18 +1,11 @@
+import baseGetTag from './_baseGetTag.js';
 import isObject from './isObject.js';
 
 /** `Object#toString` result references. */
-var funcTag = '[object Function]',
+var asyncTag = '[object AsyncFunction]',
-    genTag = '[object GeneratorFunction]';
+    funcTag = '[object Function]',
-
+    genTag = '[object GeneratorFunction]',
-/** Used for built-in method references. */
+    proxyTag = '[object Proxy]';
-var objectProto = Object.prototype;
-
-/**
- * Used to resolve the
- * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
- * of values.
- */
-var objectToString = objectProto.toString;
 
 /**
  * Checks if `value` is classified as a `Function` object.
@@ -32,10 +25,13 @@ var objectToString = objectProto.toString;
  * // => false
  */
 function isFunction(value) {
+  if (!isObject(value)) {
+    return false;
+  }
   // The use of `Object#toString` avoids issues with the `typeof` operator
-  // in Safari 8-9 which returns 'object' for typed array and other constructors.
+  // in Safari 9 which returns 'object' for typed arrays and other constructors.
-  var tag = isObject(value) ? objectToString.call(value) : '';
+  var tag = baseGetTag(value);
-  return tag == funcTag || tag == genTag;
+  return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;
 }
 
 export default isFunction;

isNumber.js

@@ -1,18 +1,9 @@
+import baseGetTag from './_baseGetTag.js';
 import isObjectLike from './isObjectLike.js';
 
 /** `Object#toString` result references. */
 var numberTag = '[object Number]';
 
-/** Used for built-in method references. */
-var objectProto = Object.prototype;
-
-/**
- * Used to resolve the
- * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
- * of values.
- */
-var objectToString = objectProto.toString;
-
 /**
  * Checks if `value` is classified as a `Number` primitive or object.
  *
@@ -41,7 +32,7 @@ var objectToString = objectProto.toString;
  */
 function isNumber(value) {
   return typeof value == 'number' ||
-    (isObjectLike(value) && objectToString.call(value) == numberTag);
+    (isObjectLike(value) && baseGetTag(value) == numberTag);
 }
 
 export default isNumber;

isPlainObject.js

@@ -1,3 +1,4 @@
+import baseGetTag from './_baseGetTag.js';
 import getPrototype from './_getPrototype.js';
 import isObjectLike from './isObjectLike.js';
 
@@ -17,13 +18,6 @@ var hasOwnProperty = objectProto.hasOwnProperty;
 /** Used to infer the `Object` constructor. */
 var objectCtorString = funcToString.call(Object);
 
-/**
- * Used to resolve the
- * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
- * of values.
- */
-var objectToString = objectProto.toString;
-
 /**
  * Checks if `value` is a plain object, that is, an object created by the
  * `Object` constructor or one with a `[[Prototype]]` of `null`.
@@ -53,7 +47,7 @@ var objectToString = objectProto.toString;
  * // => true
  */
 function isPlainObject(value) {
-  if (!isObjectLike(value) || objectToString.call(value) != objectTag) {
+  if (!isObjectLike(value) || baseGetTag(value) != objectTag) {
     return false;
   }
   var proto = getPrototype(value);
@@ -61,8 +55,8 @@ function isPlainObject(value) {
     return true;
   }
   var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor;
-  return (typeof Ctor == 'function' &&
+  return typeof Ctor == 'function' && Ctor instanceof Ctor &&
-    Ctor instanceof Ctor && funcToString.call(Ctor) == objectCtorString);
+    funcToString.call(Ctor) == objectCtorString;
 }
 
 export default isPlainObject;

isString.js

@@ -1,19 +1,10 @@
+import baseGetTag from './_baseGetTag.js';
 import isArray from './isArray.js';
 import isObjectLike from './isObjectLike.js';
 
 /** `Object#toString` result references. */
 var stringTag = '[object String]';
 
-/** Used for built-in method references. */
-var objectProto = Object.prototype;
-
-/**
- * Used to resolve the
- * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
- * of values.
- */
-var objectToString = objectProto.toString;
-
 /**
  * Checks if `value` is classified as a `String` primitive or object.
  *
@@ -33,7 +24,7 @@ var objectToString = objectProto.toString;
  */
 function isString(value) {
   return typeof value == 'string' ||
-    (!isArray(value) && isObjectLike(value) && objectToString.call(value) == stringTag);
+    (!isArray(value) && isObjectLike(value) && baseGetTag(value) == stringTag);
 }
 
 export default isString;

isSymbol.js

@@ -1,18 +1,9 @@
+import baseGetTag from './_baseGetTag.js';
 import isObjectLike from './isObjectLike.js';
 
 /** `Object#toString` result references. */
 var symbolTag = '[object Symbol]';
 
-/** Used for built-in method references. */
-var objectProto = Object.prototype;
-
-/**
- * Used to resolve the
- * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
- * of values.
- */
-var objectToString = objectProto.toString;
-
 /**
  * Checks if `value` is classified as a `Symbol` primitive or object.
  *
@@ -32,7 +23,7 @@ var objectToString = objectProto.toString;
  */
 function isSymbol(value) {
   return typeof value == 'symbol' ||
-    (isObjectLike(value) && objectToString.call(value) == symbolTag);
+    (isObjectLike(value) && baseGetTag(value) == symbolTag);
 }
 
 export default isSymbol;

isWeakSet.js

@@ -1,18 +1,9 @@
+import baseGetTag from './_baseGetTag.js';
 import isObjectLike from './isObjectLike.js';
 
 /** `Object#toString` result references. */
 var weakSetTag = '[object WeakSet]';
 
-/** Used for built-in method references. */
-var objectProto = Object.prototype;
-
-/**
- * Used to resolve the
- * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
- * of values.
- */
-var objectToString = objectProto.toString;
-
 /**
  * Checks if `value` is classified as a `WeakSet` object.
  *
@@ -31,7 +22,7 @@ var objectToString = objectProto.toString;
  * // => false
  */
 function isWeakSet(value) {
-  return isObjectLike(value) && objectToString.call(value) == weakSetTag;
+  return isObjectLike(value) && baseGetTag(value) == weakSetTag;
 }
 
 export default isWeakSet;

join.js

@@ -20,7 +20,7 @@ var nativeJoin = arrayProto.join;
  * // => 'a~b~c'
  */
 function join(array, separator) {
-  return array ? nativeJoin.call(array, separator) : '';
+  return array == null ? '' : nativeJoin.call(array, separator);
 }
 
 export default join;

keyBy.js

@@ -12,8 +12,7 @@ import createAggregator from './_createAggregator.js';
  * @since 4.0.0
  * @category Collection
  * @param {Array|Object} collection The collection to iterate over.
- * @param {Function} [iteratee=_.identity]
+ * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
- *  The iteratee to transform keys.
  * @returns {Object} Returns the composed aggregate object.
  * @example
  *

last.js

@@ -13,7 +13,7 @@
  * // => 3
  */
 function last(array) {
-  var length = array ? array.length : 0;
+  var length = array == null ? 0 : array.length;
   return length ? array[length - 1] : undefined;
 }
 

lastIndexOf.js

@@ -29,7 +29,7 @@ var nativeMax = Math.max,
  * // => 1
  */
 function lastIndexOf(array, value, fromIndex) {
-  var length = array ? array.length : 0;
+  var length = array == null ? 0 : array.length;
   if (!length) {
     return -1;
   }