Bump to v4.1.0.

invert.js

@@ -1,23 +1,16 @@
-var arrayReduce = require('./internal/arrayReduce'),
-    keys = require('./keys');
-
-/** Used for built-in method references. */
-var objectProto = global.Object.prototype;
-
-/** Used to check objects for own properties. */
-var hasOwnProperty = objectProto.hasOwnProperty;
+var constant = require('./constant'),
+    createInverter = require('./_createInverter'),
+    identity = require('./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
  *
@@ -25,26 +18,9 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  *
  * _.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));
 
 module.exports = invert;