Bump to v4.0.0.

maxBy.js

@@ -0,0 +1,33 @@
+import baseExtremum from './internal/baseExtremum';
+import baseIteratee from './internal/baseIteratee';
+import gt from './gt';
+
+/**
+ * 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;
+}
+
+export default maxBy;