Bump to v4.0.0.

mapValues.js

@@ -0,0 +1,39 @@
+import baseForOwn from './internal/baseForOwn';
+import baseIteratee from './internal/baseIteratee';
+
+/**
+ * Creates an object with the same keys as `object` and values generated by
+ * running each own enumerable property of `object` through `iteratee`. The
+ * iteratee function is invoked with three arguments: (value, key, object).
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {Function|Object|string} [iteratee=_.identity] The function invoked per iteration.
+ * @returns {Object} Returns the new mapped object.
+ * @example
+ *
+ * var users = {
+ *   'fred':    { 'user': 'fred',    'age': 40 },
+ *   'pebbles': { 'user': 'pebbles', 'age': 1 }
+ * };
+ *
+ * _.mapValues(users, function(o) { return o.age; });
+ * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
+ *
+ * // using the `_.property` iteratee shorthand
+ * _.mapValues(users, 'age');
+ * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
+ */
+function mapValues(object, iteratee) {
+  var result = {};
+  iteratee = baseIteratee(iteratee, 3);
+
+  baseForOwn(object, function(value, key, object) {
+    result[key] = iteratee(value, key, object);
+  });
+  return result;
+}
+
+export default mapValues;