invokeMap.js
 1  var apply = require('./_apply'),
 2      baseEach = require('./_baseEach'),
 3      baseInvoke = require('./_baseInvoke'),
 4      baseRest = require('./_baseRest'),
 5      isArrayLike = require('./isArrayLike');
 6  
 7  /**
 8   * Invokes the method at `path` of each element in `collection`, returning
 9   * an array of the results of each invoked method. Any additional arguments
10   * are provided to each invoked method. If `path` is a function, it's invoked
11   * for, and `this` bound to, each element in `collection`.
12   *
13   * @static
14   * @memberOf _
15   * @since 4.0.0
16   * @category Collection
17   * @param {Array|Object} collection The collection to iterate over.
18   * @param {Array|Function|string} path The path of the method to invoke or
19   *  the function invoked per iteration.
20   * @param {...*} [args] The arguments to invoke each method with.
21   * @returns {Array} Returns the array of results.
22   * @example
23   *
24   * _.invokeMap([[5, 1, 7], [3, 2, 1]], 'sort');
25   * // => [[1, 5, 7], [1, 2, 3]]
26   *
27   * _.invokeMap([123, 456], String.prototype.split, '');
28   * // => [['1', '2', '3'], ['4', '5', '6']]
29   */
30  var invokeMap = baseRest(function(collection, path, args) {
31    var index = -1,
32        isFunc = typeof path == 'function',
33        result = isArrayLike(collection) ? Array(collection.length) : [];
34  
35    baseEach(collection, function(value) {
36      result[++index] = isFunc ? apply(path, value, args) : baseInvoke(value, path, args);
37    });
38    return result;
39  });
40  
41  module.exports = invokeMap;