Bump to v4.0.0.

lodash.defaults/index.js

@@ -1,49 +1,98 @@
 /**
- * lodash 3.1.2 (Custom Build) <https://lodash.com/>
- * Build: `lodash modern modularize exports="npm" -o ./`
- * Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
+ * lodash 4.0.0 (Custom Build) <https://lodash.com/>
+ * Build: `lodash modularize exports="npm" -o ./`
+ * Copyright 2012-2016 The Dojo Foundation <http://dojofoundation.org/>
  * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
- * Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
+ * Copyright 2009-2016 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
  * Available under MIT license <https://lodash.com/license>
  */
-var assign = require('lodash.assign'),
-    restParam = require('lodash.restparam');
+var assignInWith = require('lodash.assigninwith'),
+    rest = require('lodash.rest');
 
 /**
- * Used by `_.defaults` to customize its `_.assign` use.
+ * A faster alternative to `Function#apply`, this function invokes `func`
+ * with the `this` binding of `thisArg` and the arguments of `args`.
  *
  * @private
- * @param {*} objectValue The destination object property value.
- * @param {*} sourceValue The source object property value.
- * @returns {*} Returns the value to assign to the destination object.
+ * @param {Function} func The function to invoke.
+ * @param {*} thisArg The `this` binding of `func`.
+ * @param {...*} [args] The arguments to invoke `func` with.
+ * @returns {*} Returns the result of `func`.
  */
-function assignDefaults(objectValue, sourceValue) {
-  return objectValue === undefined ? sourceValue : objectValue;
+function apply(func, thisArg, args) {
+  var length = args ? args.length : 0;
+  switch (length) {
+    case 0: return func.call(thisArg);
+    case 1: return func.call(thisArg, args[0]);
+    case 2: return func.call(thisArg, args[0], args[1]);
+    case 3: return func.call(thisArg, args[0], args[1], args[2]);
+  }
+  return func.apply(thisArg, args);
+}
+
+/** Used for built-in method references. */
+var objectProto = global.Object.prototype;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
+/**
+ * Used by `_.defaults` to customize its `_.assignIn` use.
+ *
+ * @private
+ * @param {*} objValue The destination value.
+ * @param {*} srcValue The source value.
+ * @param {string} key The key of the property to assign.
+ * @param {Object} object The parent object of `objValue`.
+ * @returns {*} Returns the value to assign.
+ */
+function assignInDefaults(objValue, srcValue, key, object) {
+  if (objValue === undefined ||
+      (eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) {
+    return srcValue;
+  }
+  return objValue;
 }
 
 /**
- * Creates a `_.defaults` or `_.defaultsDeep` function.
+ * Performs a [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * comparison between two values to determine if they are equivalent.
  *
- * @private
- * @param {Function} assigner The function to assign values.
- * @param {Function} customizer The function to customize assigned values.
- * @returns {Function} Returns the new defaults function.
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
+ * @example
+ *
+ * var object = { 'user': 'fred' };
+ * var other = { 'user': 'fred' };
+ *
+ * _.eq(object, object);
+ * // => true
+ *
+ * _.eq(object, other);
+ * // => false
+ *
+ * _.eq('a', 'a');
+ * // => true
+ *
+ * _.eq('a', Object('a'));
+ * // => false
+ *
+ * _.eq(NaN, NaN);
+ * // => true
  */
-function createDefaults(assigner, customizer) {
-  return restParam(function(args) {
-    var object = args[0];
-    if (object == null) {
-      return object;
-    }
-    args.push(customizer);
-    return assigner.apply(undefined, args);
-  });
+function eq(value, other) {
+  return value === other || (value !== value && other !== other);
 }
 
 /**
- * Assigns own enumerable properties of source object(s) to the destination
- * object for all destination properties that resolve to `undefined`. Once a
- * property is set, additional values of the same property are ignored.
+ * Assigns own and inherited enumerable properties of source objects to the
+ * destination object for all destination properties that resolve to `undefined`.
+ * Source objects are applied from left to right. Once a property is set,
+ * additional values of the same property are ignored.
  *
  * **Note:** This method mutates `object`.
  *
@@ -58,6 +107,9 @@ function createDefaults(assigner, customizer) {
  * _.defaults({ 'user': 'barney' }, { 'age': 36 }, { 'user': 'fred' });
  * // => { 'user': 'barney', 'age': 36 }
  */
-var defaults = createDefaults(assign, assignDefaults);
+var defaults = rest(function(args) {
+  args.push(undefined, assignInDefaults);
+  return apply(assignInWith, undefined, args);
+});
 
 module.exports = defaults;