1  var baseExtremum = require('./_baseExtremum'),
 2      baseGt = require('./_baseGt'),
 3      baseIteratee = require('./_baseIteratee');
 4  
 5  /**
 6   * This method is like `_.max` except that it accepts `iteratee` which is
 7   * invoked for each element in `array` to generate the criterion by which
 8   * the value is ranked. The iteratee is invoked with one argument: (value).
 9   *
10   * @static
11   * @memberOf _
12   * @since 4.0.0
13   * @category Math
14   * @param {Array} array The array to iterate over.
15   * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
16   * @returns {*} Returns the maximum value.
17   * @example
18   *
19   * var objects = [{ 'n': 1 }, { 'n': 2 }];
20   *
21   * _.maxBy(objects, function(o) { return o.n; });
22   * // => { 'n': 2 }
23   *
24   * // The `_.property` iteratee shorthand.
25   * _.maxBy(objects, 'n');
26   * // => { 'n': 2 }
27   */
28  function maxBy(array, iteratee) {
29    return (array && array.length)
30      ? baseExtremum(array, baseIteratee(iteratee, 2), baseGt)
31      : undefined;
32  }
33  
34  module.exports = maxBy;