Bump to v4.1.0.

invert.js

@@ -1,22 +1,14 @@
-define(['./internal/arrayReduce', './keys'], function(arrayReduce, keys) {
-
-  /** Used for built-in method references. */
-  var objectProto = Object.prototype;
-
-  /** Used to check objects for own properties. */
-  var hasOwnProperty = objectProto.hasOwnProperty;
+define(['./constant', './_createInverter', './identity'], function(constant, createInverter, identity) {
 
   /**
    * Creates an object composed of the inverted keys and values of `object`.
    * If `object` contains duplicate values, subsequent values overwrite property
-   * assignments of previous values unless `multiVal` is `true`.
+   * assignments of previous values.
    *
    * @static
    * @memberOf _
    * @category Object
    * @param {Object} object The object to invert.
-   * @param {boolean} [multiVal] Allow multiple values per key.
-   * @param- {Object} [guard] Enables use as an iteratee for functions like `_.map`.
    * @returns {Object} Returns the new inverted object.
    * @example
    *
@@ -24,27 +16,10 @@ define(['./internal/arrayReduce', './keys'], function(arrayReduce, keys) {
    *
    * _.invert(object);
    * // => { '1': 'c', '2': 'b' }
-   *
-   * // with `multiVal`
-   * _.invert(object, true);
-   * // => { '1': ['a', 'c'], '2': ['b'] }
    */
-  function invert(object, multiVal, guard) {
-    return arrayReduce(keys(object), function(result, key) {
-      var value = object[key];
-      if (multiVal && !guard) {
-        if (hasOwnProperty.call(result, value)) {
-          result[value].push(key);
-        } else {
-          result[value] = [key];
-        }
-      }
-      else {
-        result[value] = key;
-      }
-      return result;
-    }, {});
-  }
+  var invert = createInverter(function(result, value, key) {
+    result[value] = key;
+  }, constant(identity));
 
   return invert;
 });