From e5817a291d971124c43944ccd1e9cf18835df519 Mon Sep 17 00:00:00 2001
From: Steve Zhu <st.zhu1@gmail.com>
Date: Sat, 9 May 2015 10:29:30 -0400
Subject: [PATCH] Lodash v3.8.0

---
 .npm/package/npm-shrinkwrap.json |   2 +-
 lodash.js                        | 446 +++++++++++++++++--------------
 package.js                       |   4 +-
 3 files changed, 245 insertions(+), 207 deletions(-)

diff --git a/.npm/package/npm-shrinkwrap.json b/.npm/package/npm-shrinkwrap.json
index c910f8f..32dc3f2 100644
--- a/.npm/package/npm-shrinkwrap.json
+++ b/.npm/package/npm-shrinkwrap.json
@@ -1,7 +1,7 @@
 {
   "dependencies": {
     "lodash": {
-      "version": "3.7.0"
+      "version": "3.8.0"
     }
   }
 }
diff --git a/lodash.js b/lodash.js
index 2e8075a..2bed95a 100755
--- a/lodash.js
+++ b/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 compat -o ./lodash.js`
  * Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
  * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
@@ -13,7 +13,7 @@
   var undefined;
 
   /** 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_FLAG = 1,
@@ -88,7 +88,7 @@
       reInterpolate = /<%=([\s\S]+?)%>/g;
 
   /** Used to match property names within property paths. */
-  var reIsDeepProp = /\.|\[(?:[^[\]]+|(["'])(?:(?!\1)[^\n\\]|\\.)*?)\1\]/,
+  var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\n\\]|\\.)*?\1)\]/,
       reIsPlainProp = /^\w*$/,
       rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\n\\]|\\.)*?)\2)\]/g;
 
@@ -286,8 +286,6 @@
    */
   var root = freeGlobal || ((freeWindow !== (this && this.window)) && freeWindow) || freeSelf || this;
 
-  /*--------------------------------------------------------------------------*/
-
   /**
    * The base implementation of `compareAscending` which compares values and
    * sorts them in ascending order without guaranteeing a stable sort.
@@ -678,8 +676,6 @@
     return htmlUnescapes[chr];
   }
 
-  /*--------------------------------------------------------------------------*/
-
   /**
    * Create a new pristine `lodash` function using the given `context` object.
    *
@@ -776,7 +772,7 @@
         getOwnPropertySymbols = isNative(getOwnPropertySymbols = Object.getOwnPropertySymbols) && getOwnPropertySymbols,
         getPrototypeOf = isNative(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf,
         push = arrayProto.push,
-        preventExtensions = isNative(Object.preventExtensions = Object.preventExtensions) && preventExtensions,
+        preventExtensions = isNative(preventExtensions = Object.preventExtensions) && preventExtensions,
         propertyIsEnumerable = objectProto.propertyIsEnumerable,
         Set = isNative(Set = context.Set) && Set,
         setTimeout = context.setTimeout,
@@ -804,12 +800,19 @@
       //
       // 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;
     }());
 
     /* Native method references for those with the same name as other `lodash` methods. */
@@ -830,7 +833,7 @@
 
     /** 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,
         HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1;
 
     /** Used as the size, in bytes, of each `Float64Array` element. */
@@ -876,8 +879,6 @@
       }
     });
 
-    /*------------------------------------------------------------------------*/
-
     /**
      * Creates a `lodash` object which wraps `value` to enable implicit chaining.
      * Methods that operate on and return arrays, collections, and functions can
@@ -1017,6 +1018,7 @@
 
     (function(x) {
       var Ctor = function() { this.x = x; },
+          args = arguments,
           object = { '0': x, 'length': x },
           props = [];
 
@@ -1030,7 +1032,7 @@
        * @memberOf _.support
        * @type boolean
        */
-      support.argsTag = objToString.call(arguments) == argsTag;
+      support.argsTag = objToString.call(args) == argsTag;
 
       /**
        * Detect if `name` or `message` properties of `Error.prototype` are
@@ -1159,7 +1161,7 @@
        * @type boolean
        */
       try {
-        support.nonEnumArgs = !propertyIsEnumerable.call(arguments, 1);
+        support.nonEnumArgs = !propertyIsEnumerable.call(args, 1);
       } catch(e) {
         support.nonEnumArgs = true;
       }
@@ -1226,8 +1228,6 @@
       }
     };
 
-    /*------------------------------------------------------------------------*/
-
     /**
      * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation.
      *
@@ -1356,8 +1356,6 @@
       return result;
     }
 
-    /*------------------------------------------------------------------------*/
-
     /**
      * Creates a cache object to store key/value pairs.
      *
@@ -1426,8 +1424,6 @@
       return this;
     }
 
-    /*------------------------------------------------------------------------*/
-
     /**
      *
      * Creates a cache object to store unique values.
@@ -1477,8 +1473,6 @@
       }
     }
 
-    /*------------------------------------------------------------------------*/
-
     /**
      * Copies the values of `source` to `array`.
      *
@@ -1822,8 +1816,9 @@
      */
     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);
 
@@ -1832,7 +1827,7 @@
         if (isArr) {
           result[index] = isIndex(key, length) ? collection[key] : undefined;
         } else {
-          result[index] = collection[key];
+          result[index] = isNil ? undefined : collection[key];
         }
       }
       return result;
@@ -2162,8 +2157,8 @@
      *
      * @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) {
@@ -2174,8 +2169,8 @@
 
       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);
@@ -2183,7 +2178,6 @@
           var valIndex = -1,
               valLength = value.length;
 
-          result.length += valLength;
           while (++valIndex < valLength) {
             result[++resIndex] = value[valIndex];
           }
@@ -2305,9 +2299,9 @@
           length = path.length;
 
       while (object != null && ++index < length) {
-        var result = object = toObject(object)[path[index]];
+        object = toObject(object)[path[index]];
       }
-      return result;
+      return (index && index == length) ? object : undefined;
     }
 
     /**
@@ -2326,8 +2320,7 @@
     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;
@@ -2476,8 +2469,7 @@
      */
     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);
@@ -2577,7 +2569,7 @@
       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));
@@ -2640,10 +2632,10 @@
 
       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)
@@ -2705,7 +2697,7 @@
      * @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)) {
@@ -3191,12 +3183,12 @@
       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;
     }
@@ -3464,7 +3456,7 @@
           return index > -1 ? collection[index] : undefined;
         }
         return baseFind(collection, predicate, eachFunc);
-      }
+      };
     }
 
     /**
@@ -3530,7 +3522,7 @@
           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);
@@ -3600,6 +3592,28 @@
       };
     }
 
+    /**
+     * 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 = getCallback(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;
+      };
+    }
+
     /**
      * Creates a function for `_.padLeft` or `_.padRight`.
      *
@@ -3610,7 +3624,7 @@
     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);
       };
     }
 
@@ -3956,8 +3970,7 @@
           // 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:
@@ -4137,7 +4150,7 @@
      * 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.
@@ -4280,6 +4293,17 @@
       return func == null ? undefined : func.apply(object, args);
     }
 
+    /**
+     * 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));
+    }
+
     /**
      * Checks if `value` is a valid array-like index.
      *
@@ -4308,13 +4332,9 @@
         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);
       }
@@ -4375,7 +4395,7 @@
      *  equality comparisons, else `false`.
      */
     function isStrictComparable(value) {
-      return value === value && (value === 0 ? ((1 / value) > 0) : !isObject(value));
+      return value === value && !isObject(value);
     }
 
     /**
@@ -4449,7 +4469,7 @@
     }
 
     /**
-     * A specialized version of `_.pick` that picks `object` properties specified
+     * A specialized version of `_.pick` which picks `object` properties specified
      * by `props`.
      *
      * @private
@@ -4474,7 +4494,7 @@
     }
 
     /**
-     * A specialized version of `_.pick` that picks `object` properties `predicate`
+     * A specialized version of `_.pick` which picks `object` properties `predicate`
      * returns truthy for.
      *
      * @private
@@ -4628,7 +4648,7 @@
       if (value == null) {
         return [];
       }
-      if (!isLength(getLength(value))) {
+      if (!isArrayLike(value)) {
         return values(value);
       }
       if (lodash.support.unindexedChars && isString(value)) {
@@ -4689,8 +4709,6 @@
         : new LodashWrapper(wrapper.__wrapped__, wrapper.__chain__, arrayCopy(wrapper.__actions__));
     }
 
-    /*------------------------------------------------------------------------*/
-
     /**
      * Creates an array of elements split into groups the length of `size`.
      * If `collection` can't be split evenly, the final chunk will be the remaining
@@ -4759,11 +4777,8 @@
 
     /**
      * 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 _
@@ -4777,7 +4792,7 @@
      * // => [1, 3]
      */
     var difference = restParam(function(array, values) {
-      return (isArray(array) || isArguments(array))
+      return isArrayLike(array)
         ? baseDifference(array, baseFlatten(values, false, true))
         : [];
     });
@@ -5172,13 +5187,10 @@
 
     /**
      * 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 _
@@ -5238,13 +5250,10 @@
     }
 
     /**
-     * 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
@@ -5265,7 +5274,7 @@
 
       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);
         }
@@ -5370,14 +5379,11 @@
     }
 
     /**
-     * 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 _
@@ -5441,7 +5447,6 @@
      * // => [10, 20]
      */
     var pullAt = restParam(function(array, indexes) {
-      array || (array = []);
       indexes = baseFlatten(indexes);
 
       var result = baseAt(array, indexes);
@@ -5808,11 +5813,8 @@
 
     /**
      * 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 _
@@ -5829,8 +5831,9 @@
     });
 
     /**
-     * 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
@@ -5848,10 +5851,6 @@
      * 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
@@ -5901,7 +5900,7 @@
 
     /**
      * 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
@@ -5918,10 +5917,19 @@
      * // => [['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));
       }
@@ -5929,12 +5937,44 @@
     }
 
     /**
-     * Creates an array excluding all provided values using `SameValueZero` for
-     * equality comparisons.
+     * 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]]
      *
-     * **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`.
+     * _.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);
+      });
+    }
+
+    /**
+     * Creates an array excluding all provided values using
+     * [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+     * for equality comparisons.
      *
      * @static
      * @memberOf _
@@ -5948,7 +5988,7 @@
      * // => [3]
      */
     var without = restParam(function(array, values) {
-      return (isArray(array) || isArguments(array))
+      return isArrayLike(array)
         ? baseDifference(array, values)
         : [];
     });
@@ -5973,7 +6013,7 @@
 
       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;
@@ -6039,7 +6079,37 @@
       return result;
     }
 
-    /*------------------------------------------------------------------------*/
+    /**
+     * 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);
+    });
 
     /**
      * Creates a `lodash` object that wraps `value` with explicit method
@@ -6291,8 +6361,6 @@
       return baseWrapperValue(this.__wrapped__, this.__actions__);
     }
 
-    /*------------------------------------------------------------------------*/
-
     /**
      * Creates an array of elements corresponding to the given keys, or indexes,
      * of `collection`. Keys may be specified as individual arguments or as arrays
@@ -6314,8 +6382,7 @@
      * // => ['barney', 'pebbles']
      */
     var at = restParam(function(collection, props) {
-      var length = collection ? getLength(collection) : 0;
-      if (isLength(length)) {
+      if (isArrayLike(collection)) {
         collection = toIterable(collection);
       }
       return baseAt(collection, baseFlatten(props));
@@ -6690,13 +6757,10 @@
     });
 
     /**
-     * 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 _
@@ -6816,8 +6880,7 @@
       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]);
@@ -6846,10 +6909,11 @@
      * `_.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 _
@@ -7037,23 +7101,12 @@
      * }, []);
      * // => [4, 5, 2, 3, 0, 1]
      */
-    var reduceRight =  createReduce(arrayReduceRight, baseEachRight);
+    var reduceRight = createReduce(arrayReduceRight, baseEachRight);
 
     /**
      * 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
@@ -7432,8 +7485,6 @@
       return filter(collection, baseMatches(source));
     }
 
-    /*------------------------------------------------------------------------*/
-
     /**
      * Gets the number of milliseconds that have elapsed since the Unix epoch
      * (1 January 1970 00:00:00 UTC).
@@ -7452,8 +7503,6 @@
       return new Date().getTime();
     };
 
-    /*------------------------------------------------------------------------*/
-
     /**
      * The opposite of `_.before`; this method creates a function that invokes
      * `func` once it is called `n` or more times.
@@ -8433,8 +8482,6 @@
       return createWrapper(wrapper, PARTIAL_FLAG, null, [value], []);
     }
 
-    /*------------------------------------------------------------------------*/
-
     /**
      * Creates a clone of `value`. If `isDeep` is `true` nested objects are cloned,
      * otherwise they are assigned by reference. If `customizer` is provided it is
@@ -8566,15 +8613,13 @@
      * // => 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;
     }
     // Fallback for environments without a `toStringTag` for `arguments` objects.
     if (!support.argsTag) {
       isArguments = function(value) {
-        var length = isObjectLike(value) ? value.length : undefined;
-        return isLength(length) && hasOwnProperty.call(value, 'callee') &&
-          !propertyIsEnumerable.call(value, 'callee');
+        return isObjectLike(value) && isArrayLike(value) &&
+          hasOwnProperty.call(value, 'callee') && !propertyIsEnumerable.call(value, 'callee');
       };
     }
 
@@ -8696,10 +8741,9 @@
       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;
     }
@@ -9207,8 +9251,6 @@
       return baseCopy(value, keysIn(value));
     }
 
-    /*------------------------------------------------------------------------*/
-
     /**
      * Assigns own enumerable properties of source object(s) to the destination
      * object. Subsequent sources overwrite property assignments of previous sources.
@@ -9219,7 +9261,6 @@
      * **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
@@ -9691,12 +9732,9 @@
      * // => ['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' ? lodash.support.enumPrototypes : isLength(length))) {
+          (typeof object == 'function' ? lodash.support.enumPrototypes : isArrayLike(object))) {
         return shimKeys(object);
       }
       return isObject(object) ? nativeKeys(object) : [];
@@ -9782,6 +9820,28 @@
       return result;
     }
 
+    /**
+     * 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);
+
     /**
      * Creates an object with the same keys as `object` and values generated by
      * running each own enumerable property of `object` through `iteratee`. The
@@ -9823,15 +9883,7 @@
      * _.mapValues(users, 'age');
      * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
      */
-    function mapValues(object, iteratee, thisArg) {
-      var result = {};
-      iteratee = getCallback(iteratee, thisArg, 3);
-
-      baseForOwn(object, function(value, key, object) {
-        result[key] = iteratee(value, key, object);
-      });
-      return result;
-    }
+    var mapValues = createObjectMapper();
 
     /**
      * Recursively merges own enumerable properties of the source object(s), that
@@ -9886,11 +9938,6 @@
     /**
      * 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 _
@@ -10184,8 +10231,6 @@
       return baseValues(object, keysIn(object));
     }
 
-    /*------------------------------------------------------------------------*/
-
     /**
      * Checks if `n` is between `start` and up to but not including, `end`. If
      * `end` is not specified it is set to `start` with `start` then set to `0`.
@@ -10290,8 +10335,6 @@
       return baseRandom(min, max);
     }
 
-    /*------------------------------------------------------------------------*/
-
     /**
      * Converts `string` to [camel case](https://en.wikipedia.org/wiki/CamelCase).
      *
@@ -11157,8 +11200,6 @@
       return string.match(pattern || reWords) || [];
     }
 
-    /*------------------------------------------------------------------------*/
-
     /**
      * Attempts to invoke `func`, returning either the result or the caught error
      * object. Any additional arguments are provided to `func` when it is invoked.
@@ -11229,7 +11270,9 @@
       if (guard && isIterateeCall(func, thisArg, guard)) {
         thisArg = null;
       }
-      return baseCallback(func, thisArg);
+      return isObjectLike(func)
+        ? matches(func)
+        : baseCallback(func, thisArg);
     }
 
     /**
@@ -11354,7 +11397,7 @@
     var method = restParam(function(path, args) {
       return function(object) {
         return invokePath(object, path, args);
-      }
+      };
     });
 
     /**
@@ -11691,8 +11734,6 @@
       return baseToString(prefix) + id;
     }
 
-    /*------------------------------------------------------------------------*/
-
     /**
      * Adds two numbers.
      *
@@ -11857,8 +11898,6 @@
         : baseSum(collection, iteratee);
     }
 
-    /*------------------------------------------------------------------------*/
-
     // Ensure wrappers are instances of `baseLodash`.
     lodash.prototype = baseLodash.prototype;
 
@@ -11929,6 +11968,7 @@
     lodash.keys = keys;
     lodash.keysIn = keysIn;
     lodash.map = map;
+    lodash.mapKeys = mapKeys;
     lodash.mapValues = mapValues;
     lodash.matches = matches;
     lodash.matchesProperty = matchesProperty;
@@ -11977,6 +12017,7 @@
     lodash.union = union;
     lodash.uniq = uniq;
     lodash.unzip = unzip;
+    lodash.unzipWith = unzipWith;
     lodash.values = values;
     lodash.valuesIn = valuesIn;
     lodash.where = where;
@@ -11985,6 +12026,7 @@
     lodash.xor = xor;
     lodash.zip = zip;
     lodash.zipObject = zipObject;
+    lodash.zipWith = zipWith;
 
     // Add aliases.
     lodash.backflow = flowRight;
@@ -12003,8 +12045,6 @@
     // Add functions to `lodash.prototype`.
     mixin(lodash, lodash);
 
-    /*------------------------------------------------------------------------*/
-
     // Add functions that return unwrapped values when chaining.
     lodash.add = add;
     lodash.attempt = attempt;
@@ -12108,8 +12148,6 @@
       return source;
     }()), false);
 
-    /*------------------------------------------------------------------------*/
-
     // Add functions capable of returning wrapped and unwrapped values when chaining.
     lodash.sample = sample;
 
@@ -12122,8 +12160,6 @@
       });
     };
 
-    /*------------------------------------------------------------------------*/
-
     /**
      * The semantic version number.
      *
@@ -12234,8 +12270,13 @@
 
     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);
@@ -12258,7 +12299,6 @@
 
       lodash.prototype[methodName] = function() {
         var args = arguments,
-            length = args.length,
             chainAll = this.__chain__,
             value = this.__wrapped__,
             isHybrid = !!this.__actions__.length,
@@ -12358,8 +12398,6 @@
     return lodash;
   }
 
-  /*--------------------------------------------------------------------------*/
-
   // Export lodash.
   var _ = runInContext();
 
@@ -12392,4 +12430,4 @@
     // Export for a browser or Rhino.
     root._ = _;
   }
-}.call(this));
\ No newline at end of file
+}.call(this));
diff --git a/package.js b/package.js
index f76af0b..f4f0616 100755
--- a/package.js
+++ b/package.js
@@ -1,9 +1,9 @@
-Npm.depends({'lodash': '3.7.0'});
+Npm.depends({'lodash': '3.8.0'});
 
 Package.describe({
 	name: "stevezhu:lodash",
 	summary: "A utility library delivering consistency, customization, performance, & extras.",
-	version: "3.7.0",
+	version: "3.8.0",
 	git: "https://github.com/stevezhu/meteor-lodash.git"
 });