Bump to v3.8.0.

README.md

@@ -1,4 +1,4 @@
-# lodash-es v3.7.0
+# lodash-es v3.8.0
 
 The [modern build](https://github.com/lodash/lodash/wiki/Build-Differences) of [lodash](https://lodash.com/) exported as [ES](https://people.mozilla.org/~jorendorff/es6-draft.html) modules.
 
@@ -7,4 +7,4 @@ Generated using [lodash-cli](https://www.npmjs.com/package/lodash-cli):
 $ lodash modularize modern exports=es -o ./
 ```
 
-See the [package source](https://github.com/lodash/lodash/tree/3.7.0-es) for more details.
+See the [package source](https://github.com/lodash/lodash/tree/3.8.0-es) for more details.

array.js

@@ -34,10 +34,12 @@ import union from './array/union';
 import uniq from './array/uniq';
 import unique from './array/unique';
 import unzip from './array/unzip';
+import unzipWith from './array/unzipWith';
 import without from './array/without';
 import xor from './array/xor';
 import zip from './array/zip';
 import zipObject from './array/zipObject';
+import zipWith from './array/zipWith';
 
 export default {
   'chunk': chunk,
@@ -76,8 +78,10 @@ export default {
   'uniq': uniq,
   'unique': unique,
   'unzip': unzip,
+  'unzipWith': unzipWith,
   'without': without,
   'xor': xor,
   'zip': zip,
-  'zipObject': zipObject
+  'zipObject': zipObject,
+  'zipWith': zipWith
 };

array/difference.js

@@ -1,16 +1,12 @@
 import baseDifference from '../internal/baseDifference';
 import baseFlatten from '../internal/baseFlatten';
-import isArguments from '../lang/isArguments';
-import isArray from '../lang/isArray';
+import isArrayLike from '../internal/isArrayLike';
 import restParam from '../function/restParam';
 
 /**
  * Creates an array excluding all values of the provided arrays using
- * `SameValueZero` for equality comparisons.
- *
- * **Note:** [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
- * comparisons are like strict equality comparisons, e.g. `===`, except that
- * `NaN` matches `NaN`.
+ * [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+ * for equality comparisons.
  *
  * @static
  * @memberOf _
@@ -24,7 +20,7 @@ import restParam from '../function/restParam';
  * // => [1, 3]
  */
 var difference = restParam(function(array, values) {
-  return (isArray(array) || isArguments(array))
+  return isArrayLike(array)
     ? baseDifference(array, baseFlatten(values, false, true))
     : [];
 });

array/indexOf.js

@@ -6,13 +6,10 @@ var nativeMax = Math.max;
 
 /**
  * Gets the index at which the first occurrence of `value` is found in `array`
- * using `SameValueZero` for equality comparisons. If `fromIndex` is negative,
- * it is used as the offset from the end of `array`. If `array` is sorted
- * providing `true` for `fromIndex` performs a faster binary search.
- *
- * **Note:** [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
- * comparisons are like strict equality comparisons, e.g. `===`, except that
- * `NaN` matches `NaN`.
+ * using [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+ * for equality comparisons. If `fromIndex` is negative, it is used as the offset
+ * from the end of `array`. If `array` is sorted providing `true` for `fromIndex`
+ * performs a faster binary search.
  *
  * @static
  * @memberOf _

array/intersection.js

@@ -1,17 +1,13 @@
 import baseIndexOf from '../internal/baseIndexOf';
 import cacheIndexOf from '../internal/cacheIndexOf';
 import createCache from '../internal/createCache';
-import isArguments from '../lang/isArguments';
-import isArray from '../lang/isArray';
+import isArrayLike from '../internal/isArrayLike';
 
 /**
- * Creates an array of unique values in all provided arrays using `SameValueZero`
+ * Creates an array of unique values in all provided arrays using
+ * [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
  * for equality comparisons.
  *
- * **Note:** [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
- * comparisons are like strict equality comparisons, e.g. `===`, except that
- * `NaN` matches `NaN`.
- *
  * @static
  * @memberOf _
  * @category Array
@@ -32,7 +28,7 @@ function intersection() {
 
   while (++argsIndex < argsLength) {
     var value = arguments[argsIndex];
-    if (isArray(value) || isArguments(value)) {
+    if (isArrayLike(value)) {
       args.push(value);
       caches.push((isCommon && value.length >= 120) ? createCache(argsIndex && value) : null);
     }

array/pull.js

@@ -7,14 +7,11 @@ var arrayProto = Array.prototype;
 var splice = arrayProto.splice;
 
 /**
- * Removes all provided values from `array` using `SameValueZero` for equality
- * comparisons.
+ * Removes all provided values from `array` using
+ * [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+ * for equality comparisons.
  *
- * **Notes:**
- *  - Unlike `_.without`, this method mutates `array`
- *  - [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
- *    comparisons are like strict equality comparisons, e.g. `===`, except
- *    that `NaN` matches `NaN`
+ * **Note:** Unlike `_.without`, this method mutates `array`.
  *
  * @static
  * @memberOf _

array/pullAt.js

@@ -30,7 +30,6 @@ import restParam from '../function/restParam';
  * // => [10, 20]
  */
 var pullAt = restParam(function(array, indexes) {
-  array || (array = []);
   indexes = baseFlatten(indexes);
 
   var result = baseAt(array, indexes);

array/union.js

@@ -4,11 +4,8 @@ import restParam from '../function/restParam';
 
 /**
  * Creates an array of unique values, in order, of the provided arrays using
- * `SameValueZero` for equality comparisons.
- *
- * **Note:** [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
- * comparisons are like strict equality comparisons, e.g. `===`, except that
- * `NaN` matches `NaN`.
+ * [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+ * for equality comparisons.
  *
  * @static
  * @memberOf _

array/uniq.js

@@ -4,8 +4,9 @@ import isIterateeCall from '../internal/isIterateeCall';
 import sortedUniq from '../internal/sortedUniq';
 
 /**
- * Creates a duplicate-free version of an array, using `SameValueZero` for
- * equality comparisons, in which only the first occurence of each element
+ * Creates a duplicate-free version of an array, using
+ * [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+ * for equality comparisons, in which only the first occurence of each element
  * is kept. Providing `true` for `isSorted` performs a faster search algorithm
  * for sorted arrays. If an iteratee function is provided it is invoked for
  * each element in the array to generate the criterion by which uniqueness
@@ -23,10 +24,6 @@ import sortedUniq from '../internal/sortedUniq';
  * callback returns `true` for elements that have the properties of the given
  * object, else `false`.
  *
- * **Note:** [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
- * comparisons are like strict equality comparisons, e.g. `===`, except that
- * `NaN` matches `NaN`.
- *
  * @static
  * @memberOf _
  * @alias unique

array/unzip.js

@@ -1,11 +1,14 @@
+import arrayFilter from '../internal/arrayFilter';
 import arrayMap from '../internal/arrayMap';
-import arrayMax from '../internal/arrayMax';
 import baseProperty from '../internal/baseProperty';
-import getLength from '../internal/getLength';
+import isArrayLike from '../internal/isArrayLike';
+
+/* Native method references for those with the same name as other `lodash` methods. */
+var nativeMax = Math.max;
 
 /**
  * This method is like `_.zip` except that it accepts an array of grouped
- * elements and creates an array regrouping the elements to their pre-`_.zip`
+ * elements and creates an array regrouping the elements to their pre-zip
  * configuration.
  *
  * @static
@@ -22,10 +25,19 @@ import getLength from '../internal/getLength';
  * // => [['fred', 'barney'], [30, 40], [true, false]]
  */
 function unzip(array) {
+  if (!(array && array.length)) {
+    return [];
+  }
   var index = -1,
-      length = (array && array.length && arrayMax(arrayMap(array, getLength))) >>> 0,
-      result = Array(length);
+      length = 0;
 
+  array = arrayFilter(array, function(group) {
+    if (isArrayLike(group)) {
+      length = nativeMax(group.length, length);
+      return true;
+    }
+  });
+  var result = Array(length);
   while (++index < length) {
     result[index] = arrayMap(array, baseProperty(index));
   }

array/unzipWith.js

@@ -0,0 +1,41 @@
+import arrayMap from '../internal/arrayMap';
+import arrayReduce from '../internal/arrayReduce';
+import bindCallback from '../internal/bindCallback';
+import unzip from './unzip';
+
+/**
+ * This method is like `_.unzip` except that it accepts an iteratee to specify
+ * how regrouped values should be combined. The `iteratee` is bound to `thisArg`
+ * and invoked with four arguments: (accumulator, value, index, group).
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array of grouped elements to process.
+ * @param {Function} [iteratee] The function to combine regrouped values.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Array} Returns the new array of regrouped elements.
+ * @example
+ *
+ * var zipped = _.zip([1, 2], [10, 20], [100, 200]);
+ * // => [[1, 10, 100], [2, 20, 200]]
+ *
+ * _.unzipWith(zipped, _.add);
+ * // => [3, 30, 300]
+ */
+function unzipWith(array, iteratee, thisArg) {
+  var length = array ? array.length : 0;
+  if (!length) {
+    return [];
+  }
+  var result = unzip(array);
+  if (iteratee == null) {
+    return result;
+  }
+  iteratee = bindCallback(iteratee, thisArg, 4);
+  return arrayMap(result, function(group) {
+    return arrayReduce(group, iteratee, undefined, true);
+  });
+}
+
+export default unzipWith;

array/without.js

@@ -1,15 +1,11 @@
 import baseDifference from '../internal/baseDifference';
-import isArguments from '../lang/isArguments';
-import isArray from '../lang/isArray';
+import isArrayLike from '../internal/isArrayLike';
 import restParam from '../function/restParam';
 
 /**
- * Creates an array excluding all provided values using `SameValueZero` for
- * equality comparisons.
- *
- * **Note:** [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
- * comparisons are like strict equality comparisons, e.g. `===`, except that
- * `NaN` matches `NaN`.
+ * Creates an array excluding all provided values using
+ * [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+ * for equality comparisons.
  *
  * @static
  * @memberOf _
@@ -23,7 +19,7 @@ import restParam from '../function/restParam';
  * // => [3]
  */
 var without = restParam(function(array, values) {
-  return (isArray(array) || isArguments(array))
+  return isArrayLike(array)
     ? baseDifference(array, values)
     : [];
 });

array/xor.js

@@ -1,7 +1,6 @@
 import baseDifference from '../internal/baseDifference';
 import baseUniq from '../internal/baseUniq';
-import isArguments from '../lang/isArguments';
-import isArray from '../lang/isArray';
+import isArrayLike from '../internal/isArrayLike';
 
 /**
  * Creates an array that is the [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
@@ -23,7 +22,7 @@ function xor() {
 
   while (++index < length) {
     var array = arguments[index];
-    if (isArray(array) || isArguments(array)) {
+    if (isArrayLike(array)) {
       var result = result
         ? baseDifference(result, array).concat(baseDifference(array, result))
         : array;

array/zipWith.js

@@ -0,0 +1,36 @@
+import restParam from '../function/restParam';
+import unzipWith from './unzipWith';
+
+/**
+ * This method is like `_.zip` except that it accepts an iteratee to specify
+ * how grouped values should be combined. The `iteratee` is bound to `thisArg`
+ * and invoked with four arguments: (accumulator, value, index, group).
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {...Array} [arrays] The arrays to process.
+ * @param {Function} [iteratee] The function to combine grouped values.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Array} Returns the new array of grouped elements.
+ * @example
+ *
+ * _.zipWith([1, 2], [10, 20], [100, 200], _.add);
+ * // => [111, 222]
+ */
+var zipWith = restParam(function(arrays) {
+  var length = arrays.length,
+      iteratee = arrays[length - 2],
+      thisArg = arrays[length - 1];
+
+  if (length > 2 && typeof iteratee == 'function') {
+    length -= 2;
+  } else {
+    iteratee = (length > 1 && typeof thisArg == 'function') ? (--length, thisArg) : undefined;
+    thisArg = undefined;
+  }
+  arrays.length = length;
+  return unzipWith(arrays, iteratee, thisArg);
+});
+
+export default zipWith;

collection/at.js

@@ -1,9 +1,6 @@
 import baseAt from '../internal/baseAt';
 import baseFlatten from '../internal/baseFlatten';
-import getLength from '../internal/getLength';
-import isLength from '../internal/isLength';
 import restParam from '../function/restParam';
-import toIterable from '../internal/toIterable';
 
 /**
  * Creates an array of elements corresponding to the given keys, or indexes,
@@ -26,10 +23,6 @@ import toIterable from '../internal/toIterable';
  * // => ['barney', 'pebbles']
  */
 var at = restParam(function(collection, props) {
-  var length = collection ? getLength(collection) : 0;
-  if (isLength(length)) {
-    collection = toIterable(collection);
-  }
   return baseAt(collection, baseFlatten(props));
 });
 

collection/includes.js

@@ -10,13 +10,10 @@ import values from '../object/values';
 var nativeMax = Math.max;
 
 /**
- * Checks if `value` is in `collection` using `SameValueZero` for equality
- * comparisons. If `fromIndex` is negative, it is used as the offset from
- * the end of `collection`.
- *
- * **Note:** [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
- * comparisons are like strict equality comparisons, e.g. `===`, except that
- * `NaN` matches `NaN`.
+ * Checks if `value` is in `collection` using
+ * [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+ * for equality comparisons. If `fromIndex` is negative, it is used as the offset
+ * from the end of `collection`.
  *
  * @static
  * @memberOf _

collection/invoke.js

@@ -1,8 +1,7 @@
 import baseEach from '../internal/baseEach';
-import getLength from '../internal/getLength';
 import invokePath from '../internal/invokePath';
+import isArrayLike from '../internal/isArrayLike';
 import isKey from '../internal/isKey';
-import isLength from '../internal/isLength';
 import restParam from '../function/restParam';
 
 /**
@@ -31,8 +30,7 @@ var invoke = restParam(function(collection, path, args) {
   var index = -1,
       isFunc = typeof path == 'function',
       isProp = isKey(path),
-      length = getLength(collection),
-      result = isLength(length) ? Array(length) : [];
+      result = isArrayLike(collection) ? Array(collection.length) : [];
 
   baseEach(collection, function(value) {
     var func = isFunc ? path : (isProp && value != null && value[path]);

collection/map.js

@@ -23,10 +23,11 @@ import isArray from '../lang/isArray';
  * `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`.
  *
  * The guarded methods are:
- * `ary`, `callback`, `chunk`, `clone`, `create`, `curry`, `curryRight`, `drop`,
- * `dropRight`, `every`, `fill`, `flatten`, `invert`, `max`, `min`, `parseInt`,
- * `slice`, `sortBy`, `take`, `takeRight`, `template`, `trim`, `trimLeft`,
- * `trimRight`, `trunc`, `random`, `range`, `sample`, `some`, `uniq`, and `words`
+ * `ary`, `callback`, `chunk`, `clone`, `create`, `curry`, `curryRight`,
+ * `drop`, `dropRight`, `every`, `fill`, `flatten`, `invert`, `max`, `min`,
+ * `parseInt`, `slice`, `sortBy`, `take`, `takeRight`, `template`, `trim`,
+ * `trimLeft`, `trimRight`, `trunc`, `random`, `range`, `sample`, `some`,
+ * `sum`, `uniq`, and `words`
  *
  * @static
  * @memberOf _

collection/reduceRight.js

@@ -24,6 +24,6 @@ import createReduce from '../internal/createReduce';
  * }, []);
  * // => [4, 5, 2, 3, 0, 1]
  */
-var reduceRight =  createReduce(arrayReduceRight, baseEachRight);
+var reduceRight = createReduce(arrayReduceRight, baseEachRight);
 
 export default reduceRight;

collection/reject.js

@@ -7,17 +7,6 @@ import isArray from '../lang/isArray';
  * The opposite of `_.filter`; this method returns the elements of `collection`
  * that `predicate` does **not** return truthy for.
  *
- * If a property name is provided for `predicate` the created `_.property`
- * style callback returns the property value of the given element.
- *
- * If a value is also provided for `thisArg` the created `_.matchesProperty`
- * style callback returns `true` for elements that have a matching property
- * value, else `false`.
- *
- * If an object is provided for `predicate` the created `_.matches` style
- * callback returns `true` for elements that have the properties of the given
- * object, else `false`.
- *
  * @static
  * @memberOf _
  * @category Collection

internal/baseAssign.js

@@ -4,7 +4,7 @@ import isNative from '../lang/isNative';
 import keys from '../object/keys';
 
 /** Native method references. */
-var preventExtensions = isNative(Object.preventExtensions = Object.preventExtensions) && preventExtensions;
+var preventExtensions = isNative(preventExtensions = Object.preventExtensions) && preventExtensions;
 
 /** Used as `baseAssign`. */
 var nativeAssign = (function() {
@@ -14,12 +14,19 @@ var nativeAssign = (function() {
   //
   // Use `Object.preventExtensions` on a plain object instead of simply using
   // `Object('x')` because Chrome and IE fail to throw an error when attempting
-  // to assign values to readonly indexes of strings in strict mode.
-  var object = { '1': 0 },
-      func = preventExtensions && isNative(func = Object.assign) && func;
-
-  try { func(preventExtensions(object), 'xo'); } catch(e) {}
-  return !object[1] && func;
+  // to assign values to readonly indexes of strings.
+  var func = preventExtensions && isNative(func = Object.assign) && func;
+  try {
+    if (func) {
+      var object = preventExtensions({ '1': 0 });
+      object[0] = 1;
+    }
+  } catch(e) {
+    // Only attempt in strict mode.
+    try { func(object, 'xo'); } catch(e) {}
+    return !object[1] && func;
+  }
+  return false;
 }());
 
 /**

internal/baseAt.js

@@ -1,5 +1,5 @@
+import isArrayLike from './isArrayLike';
 import isIndex from './isIndex';
-import isLength from './isLength';
 
 /**
  * The base implementation of `_.at` without support for string collections
@@ -12,8 +12,9 @@ import isLength from './isLength';
  */
 function baseAt(collection, props) {
   var index = -1,
-      length = collection.length,
-      isArr = isLength(length),
+      isNil = collection == null,
+      isArr = !isNil && isArrayLike(collection),
+      length = isArr && collection.length,
       propsLength = props.length,
       result = Array(propsLength);
 
@@ -22,7 +23,7 @@ function baseAt(collection, props) {
     if (isArr) {
       result[index] = isIndex(key, length) ? collection[key] : undefined;
     } else {
-      result[index] = collection[key];
+      result[index] = isNil ? undefined : collection[key];
     }
   }
   return result;

internal/baseFlatten.js

@@ -1,6 +1,6 @@
 import isArguments from '../lang/isArguments';
 import isArray from '../lang/isArray';
-import isLength from './isLength';
+import isArrayLike from './isArrayLike';
 import isObjectLike from './isObjectLike';
 
 /**
@@ -9,8 +9,8 @@ import isObjectLike from './isObjectLike';
  *
  * @private
  * @param {Array} array The array to flatten.
- * @param {boolean} isDeep Specify a deep flatten.
- * @param {boolean} isStrict Restrict flattening to arrays and `arguments` objects.
+ * @param {boolean} [isDeep] Specify a deep flatten.
+ * @param {boolean} [isStrict] Restrict flattening to arrays-like objects.
  * @returns {Array} Returns the new flattened array.
  */
 function baseFlatten(array, isDeep, isStrict) {
@@ -21,8 +21,8 @@ function baseFlatten(array, isDeep, isStrict) {
 
   while (++index < length) {
     var value = array[index];
-
-    if (isObjectLike(value) && isLength(value.length) && (isArray(value) || isArguments(value))) {
+    if (isObjectLike(value) && isArrayLike(value) &&
+        (isStrict || isArray(value) || isArguments(value))) {
       if (isDeep) {
         // Recursively flatten arrays (susceptible to call stack limits).
         value = baseFlatten(value, isDeep, isStrict);
@@ -30,7 +30,6 @@ function baseFlatten(array, isDeep, isStrict) {
       var valIndex = -1,
           valLength = value.length;
 
-      result.length += valLength;
       while (++valIndex < valLength) {
         result[++resIndex] = value[valIndex];
       }

internal/baseGet.js

@@ -21,9 +21,9 @@ function baseGet(object, path, pathKey) {
       length = path.length;
 
   while (object != null && ++index < length) {
-    var result = object = object[path[index]];
+    object = object[path[index]];
   }
-  return result;
+  return (index && index == length) ? object : undefined;
 }
 
 export default baseGet;

internal/baseIsEqual.js

@@ -16,8 +16,7 @@ import baseIsEqualDeep from './baseIsEqualDeep';
 function baseIsEqual(value, other, customizer, isLoose, stackA, stackB) {
   // Exit early for identical values.
   if (value === other) {
-    // Treat `+0` vs. `-0` as not equal.
-    return value !== 0 || (1 / value == 1 / other);
+    return true;
   }
   var valType = typeof value,
       othType = typeof other;

internal/baseMap.js

@@ -1,6 +1,5 @@
 import baseEach from './baseEach';
-import getLength from './getLength';
-import isLength from './isLength';
+import isArrayLike from './isArrayLike';
 
 /**
  * The base implementation of `_.map` without support for callback shorthands
@@ -13,8 +12,7 @@ import isLength from './isLength';
  */
 function baseMap(collection, iteratee) {
   var index = -1,
-      length = getLength(collection),
-      result = isLength(length) ? Array(length) : [];
+      result = isArrayLike(collection) ? Array(collection.length) : [];
 
   baseEach(collection, function(value, key, collection) {
     result[++index] = iteratee(value, key, collection);

internal/baseMerge.js

@@ -2,7 +2,7 @@ import arrayEach from './arrayEach';
 import baseMergeDeep from './baseMergeDeep';
 import getSymbols from './getSymbols';
 import isArray from '../lang/isArray';
-import isLength from './isLength';
+import isArrayLike from './isArrayLike';
 import isObject from '../lang/isObject';
 import isObjectLike from './isObjectLike';
 import isTypedArray from '../lang/isTypedArray';
@@ -30,7 +30,7 @@ function baseMerge(object, source, customizer, stackA, stackB) {
   if (!isObject(object)) {
     return object;
   }
-  var isSrcArr = isLength(source.length) && (isArray(source) || isTypedArray(source));
+  var isSrcArr = isArrayLike(source) && (isArray(source) || isTypedArray(source));
   if (!isSrcArr) {
     var props = keys(source);
     push.apply(props, getSymbols(source));

internal/baseMergeDeep.js

@@ -1,8 +1,7 @@
 import arrayCopy from './arrayCopy';
-import getLength from './getLength';
 import isArguments from '../lang/isArguments';
 import isArray from '../lang/isArray';
-import isLength from './isLength';
+import isArrayLike from './isArrayLike';
 import isPlainObject from '../lang/isPlainObject';
 import isTypedArray from '../lang/isTypedArray';
 import toPlainObject from '../lang/toPlainObject';
@@ -38,10 +37,10 @@ function baseMergeDeep(object, source, key, mergeFunc, customizer, stackA, stack
 
   if (isCommon) {
     result = srcValue;
-    if (isLength(srcValue.length) && (isArray(srcValue) || isTypedArray(srcValue))) {
+    if (isArrayLike(srcValue) && (isArray(srcValue) || isTypedArray(srcValue))) {
       result = isArray(value)
         ? value
-        : (getLength(value) ? arrayCopy(value) : []);
+        : (isArrayLike(value) ? arrayCopy(value) : []);
     }
     else if (isPlainObject(srcValue) || isArguments(srcValue)) {
       result = isArguments(value)

internal/basePullAt.js

@@ -16,7 +16,7 @@ var splice = arrayProto.splice;
  * @returns {Array} Returns `array`.
  */
 function basePullAt(array, indexes) {
-  var length = indexes.length;
+  var length = array ? indexes.length : 0;
   while (length--) {
     var index = parseFloat(indexes[length]);
     if (index != previous && isIndex(index)) {

internal/binaryIndexBy.js

@@ -6,7 +6,7 @@ var nativeMin = Math.min;
 
 /** Used as references for the maximum length and index of an array. */
 var MAX_ARRAY_LENGTH = Math.pow(2, 32) - 1,
-    MAX_ARRAY_INDEX =  MAX_ARRAY_LENGTH - 1;
+    MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1;
 
 /**
  * This function is like `binaryIndex` except that it invokes `iteratee` for

internal/composeArgsRight.js

@@ -23,12 +23,12 @@ function composeArgsRight(args, partials, holders) {
   while (++argsIndex < argsLength) {
     result[argsIndex] = args[argsIndex];
   }
-  var pad = argsIndex;
+  var offset = argsIndex;
   while (++rightIndex < rightLength) {
-    result[pad + rightIndex] = partials[rightIndex];
+    result[offset + rightIndex] = partials[rightIndex];
   }
   while (++holdersIndex < holdersLength) {
-    result[pad + holders[holdersIndex]] = args[argsIndex++];
+    result[offset + holders[holdersIndex]] = args[argsIndex++];
   }
   return result;
 }

internal/createFind.js

@@ -19,7 +19,7 @@ function createFind(eachFunc, fromRight) {
       return index > -1 ? collection[index] : undefined;
     }
     return baseFind(collection, predicate, eachFunc);
-  }
+  };
 }
 
 export default createFind;

internal/createFlow.js

@@ -4,6 +4,12 @@ import getFuncName from './getFuncName';
 import isArray from '../lang/isArray';
 import isLaziable from './isLaziable';
 
+/** Used to compose bitmasks for wrapper metadata. */
+var CURRY_FLAG = 8,
+    PARTIAL_FLAG = 32,
+    ARY_FLAG = 128,
+    REARG_FLAG = 256;
+
 /** Used as the `TypeError` message for "Functions" methods. */
 var FUNC_ERROR_TEXT = 'Expected a function';
 
@@ -39,7 +45,7 @@ function createFlow(fromRight) {
       funcName = getFuncName(func);
 
       var data = funcName == 'wrapper' ? getData(func) : null;
-      if (data && isLaziable(data[0])) {
+      if (data && isLaziable(data[0]) && data[1] == (ARY_FLAG | CURRY_FLAG | PARTIAL_FLAG | REARG_FLAG) && !data[4].length && data[9] == 1) {
         wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);
       } else {
         wrapper = (func.length == 1 && isLaziable(func)) ? wrapper[funcName]() : wrapper.thru(func);

internal/createObjectMapper.js

@@ -0,0 +1,26 @@
+import baseCallback from './baseCallback';
+import baseForOwn from './baseForOwn';
+
+/**
+ * Creates a function for `_.mapKeys` or `_.mapValues`.
+ *
+ * @private
+ * @param {boolean} [isMapKeys] Specify mapping keys instead of values.
+ * @returns {Function} Returns the new map function.
+ */
+function createObjectMapper(isMapKeys) {
+  return function(object, iteratee, thisArg) {
+    var result = {};
+    iteratee = baseCallback(iteratee, thisArg, 3);
+
+    baseForOwn(object, function(value, key, object) {
+      var mapped = iteratee(value, key, object);
+      key = isMapKeys ? mapped : key;
+      value = isMapKeys ? value : mapped;
+      result[key] = value;
+    });
+    return result;
+  };
+}
+
+export default createObjectMapper;

internal/createPadDir.js

@@ -11,7 +11,7 @@ import createPadding from './createPadding';
 function createPadDir(fromRight) {
   return function(string, length, chars) {
     string = baseToString(string);
-    return string && ((fromRight ? string : '') + createPadding(string, length, chars) + (fromRight ? '' : string));
+    return (fromRight ? string : '') + createPadding(string, length, chars) + (fromRight ? '' : string);
   };
 }
 

internal/equalByTag.js

@@ -34,8 +34,7 @@ function equalByTag(object, other, tag) {
       // Treat `NaN` vs. `NaN` as equal.
       return (object != +object)
         ? other != +other
-        // But, treat `-0` vs. `+0` as not equal.
-        : (object == 0 ? ((1 / object) == (1 / other)) : object == +other);
+        : object == +other;
 
     case regexpTag:
     case stringTag:

internal/getLength.js

@@ -4,7 +4,7 @@ import baseProperty from './baseProperty';
  * Gets the "length" property value of `object`.
  *
  * **Note:** This function is used to avoid a [JIT bug](https://bugs.webkit.org/show_bug.cgi?id=142792)
- * in Safari on iOS 8.1 ARM64.
+ * that affects Safari on at least iOS 8.1-8.3 ARM64.
  *
  * @private
  * @param {Object} object The object to query.

internal/isArrayLike.js

@@ -0,0 +1,15 @@
+import getLength from './getLength';
+import isLength from './isLength';
+
+/**
+ * Checks if `value` is array-like.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
+ */
+function isArrayLike(value) {
+  return value != null && isLength(getLength(value));
+}
+
+export default isArrayLike;

internal/isIterateeCall.js

@@ -1,6 +1,5 @@
-import getLength from './getLength';
+import isArrayLike from './isArrayLike';
 import isIndex from './isIndex';
-import isLength from './isLength';
 import isObject from '../lang/isObject';
 
 /**
@@ -17,13 +16,9 @@ function isIterateeCall(value, index, object) {
     return false;
   }
   var type = typeof index;
-  if (type == 'number') {
-    var length = getLength(object),
-        prereq = isLength(length) && isIndex(index, length);
-  } else {
-    prereq = type == 'string' && index in object;
-  }
-  if (prereq) {
+  if (type == 'number'
+      ? (isArrayLike(object) && isIndex(index, object.length))
+      : (type == 'string' && index in object)) {
     var other = object[index];
     return value === value ? (value === other) : (other !== other);
   }

internal/isKey.js

@@ -2,7 +2,7 @@ import isArray from '../lang/isArray';
 import toObject from './toObject';
 
 /** Used to match property names within property paths. */
-var reIsDeepProp = /\.|\[(?:[^[\]]+|(["'])(?:(?!\1)[^\n\\]|\\.)*?)\1\]/,
+var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\n\\]|\\.)*?\1)\]/,
     reIsPlainProp = /^\w*$/;
 
 /**

internal/isStrictComparable.js

@@ -9,7 +9,7 @@ import isObject from '../lang/isObject';
  *  equality comparisons, else `false`.
  */
 function isStrictComparable(value) {
-  return value === value && (value === 0 ? ((1 / value) > 0) : !isObject(value));
+  return value === value && !isObject(value);
 }
 
 export default isStrictComparable;

internal/pickByArray.js

@@ -1,7 +1,7 @@
 import toObject from './toObject';
 
 /**
- * A specialized version of `_.pick` that picks `object` properties specified
+ * A specialized version of `_.pick` which picks `object` properties specified
  * by `props`.
  *
  * @private

internal/pickByCallback.js

@@ -1,7 +1,7 @@
 import baseForIn from './baseForIn';
 
 /**
- * A specialized version of `_.pick` that picks `object` properties `predicate`
+ * A specialized version of `_.pick` which picks `object` properties `predicate`
  * returns truthy for.
  *
  * @private

internal/toIterable.js

@@ -1,5 +1,4 @@
-import getLength from './getLength';
-import isLength from './isLength';
+import isArrayLike from './isArrayLike';
 import isObject from '../lang/isObject';
 import values from '../object/values';
 
@@ -14,7 +13,7 @@ function toIterable(value) {
   if (value == null) {
     return [];
   }
-  if (!isLength(getLength(value))) {
+  if (!isArrayLike(value)) {
     return values(value);
   }
   return isObject(value) ? value : Object(value);

lang/isArguments.js

@@ -1,4 +1,4 @@
-import isLength from '../internal/isLength';
+import isArrayLike from '../internal/isArrayLike';
 import isObjectLike from '../internal/isObjectLike';
 
 /** `Object#toString` result references. */
@@ -30,8 +30,7 @@ var objToString = objectProto.toString;
  * // => false
  */
 function isArguments(value) {
-  var length = isObjectLike(value) ? value.length : undefined;
-  return isLength(length) && objToString.call(value) == argsTag;
+  return isObjectLike(value) && isArrayLike(value) && objToString.call(value) == argsTag;
 }
 
 export default isArguments;

lang/isEmpty.js

@@ -1,8 +1,7 @@
-import getLength from '../internal/getLength';
 import isArguments from './isArguments';
 import isArray from './isArray';
+import isArrayLike from '../internal/isArrayLike';
 import isFunction from './isFunction';
-import isLength from '../internal/isLength';
 import isObjectLike from '../internal/isObjectLike';
 import isString from './isString';
 import keys from '../object/keys';
@@ -38,10 +37,9 @@ function isEmpty(value) {
   if (value == null) {
     return true;
   }
-  var length = getLength(value);
-  if (isLength(length) && (isArray(value) || isString(value) || isArguments(value) ||
+  if (isArrayLike(value) && (isArray(value) || isString(value) || isArguments(value) ||
       (isObjectLike(value) && isFunction(value.splice)))) {
-    return !length;
+    return !value.length;
   }
   return !keys(value).length;
 }

lang/isRegExp.js

@@ -29,7 +29,7 @@ var objToString = objectProto.toString;
  * // => false
  */
 function isRegExp(value) {
-  return (isObjectLike(value) && objToString.call(value) == regexpTag) || false;
+  return isObjectLike(value) && objToString.call(value) == regexpTag;
 }
 
 export default isRegExp;

lodash.js

@@ -1,6 +1,6 @@
 /**
  * @license
- * lodash 3.7.0 (Custom Build) <https://lodash.com/>
+ * lodash 3.8.0 (Custom Build) <https://lodash.com/>
  * Build: `lodash modularize modern exports="es" -o ./`
  * Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
  * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
@@ -42,7 +42,7 @@ import support from './support';
 import thru from './chain/thru';
 
 /** Used as the semantic version number. */
-var VERSION = '3.7.0';
+var VERSION = '3.8.0';
 
 /** Used to compose bitmasks for wrapper metadata. */
 var BIND_KEY_FLAG = 2;
@@ -130,6 +130,7 @@ lodash.invoke = collection.invoke;
 lodash.keys = keys;
 lodash.keysIn = object.keysIn;
 lodash.map = collection.map;
+lodash.mapKeys = object.mapKeys;
 lodash.mapValues = object.mapValues;
 lodash.matches = utility.matches;
 lodash.matchesProperty = utility.matchesProperty;
@@ -178,6 +179,7 @@ lodash.transform = object.transform;
 lodash.union = array.union;
 lodash.uniq = array.uniq;
 lodash.unzip = array.unzip;
+lodash.unzipWith = array.unzipWith;
 lodash.values = object.values;
 lodash.valuesIn = object.valuesIn;
 lodash.where = collection.where;
@@ -186,6 +188,7 @@ lodash.wrap = func.wrap;
 lodash.xor = array.xor;
 lodash.zip = array.zip;
 lodash.zipObject = array.zipObject;
+lodash.zipWith = array.zipWith;
 
 // Add aliases.
 lodash.backflow = func.flowRight;
@@ -430,8 +433,13 @@ LazyWrapper.prototype.reject = function(predicate, thisArg) {
 
 LazyWrapper.prototype.slice = function(start, end) {
   start = start == null ? 0 : (+start || 0);
-  var result = start < 0 ? this.takeRight(-start) : this.drop(start);
 
+  var result = this;
+  if (start < 0) {
+    result = this.takeRight(-start);
+  } else if (start) {
+    result = this.drop(start);
+  }
   if (end !== undefined) {
     end = (+end || 0);
     result = end < 0 ? result.dropRight(-end) : result.take(end - start);
@@ -454,7 +462,6 @@ baseForOwn(LazyWrapper.prototype, function(func, methodName) {
 
   lodash.prototype[methodName] = function() {
     var args = arguments,
-        length = args.length,
         chainAll = this.__chain__,
         value = this.__wrapped__,
         isHybrid = !!this.__actions__.length,

object.js

@@ -14,6 +14,7 @@ import has from './object/has';
 import invert from './object/invert';
 import keys from './object/keys';
 import keysIn from './object/keysIn';
+import mapKeys from './object/mapKeys';
 import mapValues from './object/mapValues';
 import merge from './object/merge';
 import methods from './object/methods';
@@ -43,6 +44,7 @@ export default {
   'invert': invert,
   'keys': keys,
   'keysIn': keysIn,
+  'mapKeys': mapKeys,
   'mapValues': mapValues,
   'merge': merge,
   'methods': methods,

object/assign.js

@@ -12,7 +12,6 @@ import createAssigner from '../internal/createAssigner';
  * **Note:** This method mutates `object` and is based on
  * [`Object.assign`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.assign).
  *
- *
  * @static
  * @memberOf _
  * @alias extend

object/keys.js

@@ -1,4 +1,4 @@
-import isLength from '../internal/isLength';
+import isArrayLike from '../internal/isArrayLike';
 import isNative from '../lang/isNative';
 import isObject from '../lang/isObject';
 import shimKeys from '../internal/shimKeys';
@@ -34,12 +34,9 @@ var nativeKeys = isNative(nativeKeys = Object.keys) && nativeKeys;
  * // => ['0', '1']
  */
 var keys = !nativeKeys ? shimKeys : function(object) {
-  if (object) {
-    var Ctor = object.constructor,
-        length = object.length;
-  }
+  var Ctor = object != null && object.constructor;
   if ((typeof Ctor == 'function' && Ctor.prototype === object) ||
-      (typeof object != 'function' && isLength(length))) {
+      (typeof object != 'function' && isArrayLike(object))) {
     return shimKeys(object);
   }
   return isObject(object) ? nativeKeys(object) : [];

object/mapKeys.js

@@ -0,0 +1,25 @@
+import createObjectMapper from '../internal/createObjectMapper';
+
+/**
+ * The opposite of `_.mapValues`; this method creates an object with the
+ * same values as `object` and keys generated by running each own enumerable
+ * property of `object` through `iteratee`.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {Function|Object|string} [iteratee=_.identity] The function invoked
+ *  per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Object} Returns the new mapped object.
+ * @example
+ *
+ * _.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) {
+ *   return key + value;
+ * });
+ * // => { 'a1': 1, 'b2': 2 }
+ */
+var mapKeys = createObjectMapper(true);
+
+export default mapKeys;

object/mapValues.js

@@ -1,5 +1,4 @@
-import baseCallback from '../internal/baseCallback';
-import baseForOwn from '../internal/baseForOwn';
+import createObjectMapper from '../internal/createObjectMapper';
 
 /**
  * Creates an object with the same keys as `object` and values generated by
@@ -42,14 +41,6 @@ import baseForOwn from '../internal/baseForOwn';
  * _.mapValues(users, 'age');
  * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
  */
-function mapValues(object, iteratee, thisArg) {
-  var result = {};
-  iteratee = baseCallback(iteratee, thisArg, 3);
-
-  baseForOwn(object, function(value, key, object) {
-    result[key] = iteratee(value, key, object);
-  });
-  return result;
-}
+var mapValues = createObjectMapper();
 
 export default mapValues;

object/omit.js

@@ -10,11 +10,6 @@ import restParam from '../function/restParam';
 /**
  * The opposite of `_.pick`; this method creates an object composed of the
  * own and inherited enumerable properties of `object` that are not omitted.
- * Property names may be specified as individual arguments or as arrays of
- * property names. If `predicate` is provided it is invoked for each property
- * of `object` omitting the properties `predicate` returns truthy for. The
- * predicate is bound to `thisArg` and invoked with three arguments:
- * (value, key, object).
  *
  * @static
  * @memberOf _

package.json

@@ -1,6 +1,6 @@
 {
   "name": "lodash-es",
-  "version": "3.7.0",
+  "version": "3.8.0",
   "description": "The modern build of lodash exported as ES modules.",
   "homepage": "https://lodash.com/custom-builds",
   "license": "MIT",

support.js

@@ -20,6 +20,7 @@ var support = {};
 
 (function(x) {
   var Ctor = function() { this.x = x; },
+      args = arguments,
       object = { '0': x, 'length': x },
       props = [];
 
@@ -69,7 +70,7 @@ var support = {};
    * @type boolean
    */
   try {
-    support.nonEnumArgs = !propertyIsEnumerable.call(arguments, 1);
+    support.nonEnumArgs = !propertyIsEnumerable.call(args, 1);
   } catch(e) {
     support.nonEnumArgs = true;
   }

utility/callback.js

@@ -1,5 +1,7 @@
 import baseCallback from '../internal/baseCallback';
 import isIterateeCall from '../internal/isIterateeCall';
+import isObjectLike from '../internal/isObjectLike';
+import matches from './matches';
 
 /**
  * Creates a function that invokes `func` with the `this` binding of `thisArg`
@@ -43,7 +45,9 @@ function callback(func, thisArg, guard) {
   if (guard && isIterateeCall(func, thisArg, guard)) {
     thisArg = null;
   }
-  return baseCallback(func, thisArg);
+  return isObjectLike(func)
+    ? matches(func)
+    : baseCallback(func, thisArg);
 }
 
 export default callback;

utility/method.js

@@ -25,7 +25,7 @@ import restParam from '../function/restParam';
 var method = restParam(function(path, args) {
   return function(object) {
     return invokePath(object, path, args);
-  }
+  };
 });
 
 export default method;