Bump to v4.0.0.

maxBy.js

@@ -0,0 +1,35 @@
+define(['./internal/baseExtremum', './internal/baseIteratee', './gt'], function(baseExtremum, baseIteratee, gt) {
+
+  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+  var undefined;
+
+  /**
+   * This method is like `_.max` except that it accepts `iteratee` which is
+   * invoked for each element in `array` to generate the criterion by which
+   * the value is ranked. The iteratee is invoked with one argument: (value).
+   *
+   * @static
+   * @memberOf _
+   * @category Math
+   * @param {Array} array The array to iterate over.
+   * @param {Function|Object|string} [iteratee=_.identity] The iteratee invoked per element.
+   * @returns {*} Returns the maximum value.
+   * @example
+   *
+   * var objects = [{ 'n': 1 }, { 'n': 2 }];
+   *
+   * _.maxBy(objects, function(o) { return o.a; });
+   * // => { 'n': 2 }
+   *
+   * // using the `_.property` iteratee shorthand
+   * _.maxBy(objects, 'n');
+   * // => { 'n': 2 }
+   */
+  function maxBy(array, iteratee) {
+    return (array && array.length)
+      ? baseExtremum(array, baseIteratee(iteratee), gt)
+      : undefined;
+  }
+
+  return maxBy;
+});