Make _.unzip and alias of _.zip.

Former-commit-id: fca00001ad850c250f9883572c4dce7b41dde88d

lodash.js

@@ -4468,32 +4468,6 @@
      */
     var uniq = overloadWrapper(basicUniq);
 
-    /**
-     * The inverse of `_.zip`, this method splits groups of elements into arrays
-     * composed of elements from each group at their corresponding indexes.
-     *
-     * @static
-     * @memberOf _
-     * @category Arrays
-     * @param {Array} array The array to process.
-     * @returns {Array} Returns a new array of the composed arrays.
-     * @example
-     *
-     * _.unzip([['moe', 30, true], ['larry', 40, false]]);
-     * // => [['moe', 'larry'], [30, 40], [true, false]];
-     */
-    function unzip() {
-      var array = arguments.length > 1 ? arguments : arguments[0],
-          index = -1,
-          length = array ? max(pluck(array, 'length')) : 0,
-          result = Array(length < 0 ? 0 : length);
-
-      while (++index < length) {
-        result[index] = pluck(array, index);
-      }
-      return result;
-    }
-
     /**
      * Creates an array with all occurrences of the passed values removed using
      * strict equality for comparisons, i.e. `===`.
@@ -4514,13 +4488,13 @@
     }
 
     /**
-     * Groups the elements of each array at their corresponding indexes. Useful for
-     * separate data sources that are coordinated through matching array indexes.
-     * For a matrix of nested arrays, `_.zip.apply(...)` can transpose the matrix
-     * in a similar fashion.
+     * Creates an array of grouped elements, the first of which contains the first
+     * elements of the given arrays, the second of which contains the second
+     * elements of the given arrays, and so on.
      *
      * @static
      * @memberOf _
+     * @alias unzip
      * @category Arrays
      * @param {Array} [array1, array2, ...] Arrays to process.
      * @returns {Array} Returns a new array of grouped elements.
@@ -4529,8 +4503,16 @@
      * _.zip(['moe', 'larry'], [30, 40], [true, false]);
      * // => [['moe', 30, true], ['larry', 40, false]]
      */
-    function zip(array) {
-      return array ? unzip(arguments) : [];
+    function zip() {
+      var array = arguments.length > 1 ? arguments : arguments[0],
+          index = -1,
+          length = array ? max(pluck(array, 'length')) : 0,
+          result = Array(length < 0 ? 0 : length);
+
+      while (++index < length) {
+        result[index] = pluck(array, index);
+      }
+      return result;
     }
 
     /**
@@ -5746,7 +5728,6 @@
     lodash.transform = transform;
     lodash.union = union;
     lodash.uniq = uniq;
-    lodash.unzip = unzip;
     lodash.values = values;
     lodash.where = where;
     lodash.without = without;
@@ -5764,6 +5745,7 @@
     lodash.select = filter;
     lodash.tail = rest;
     lodash.unique = uniq;
+    lodash.unzip = zip;
 
     // add functions to `lodash.prototype`
     mixin(lodash);