Bump to v4.0.0.

defaults.js

@@ -0,0 +1,30 @@
+var apply = require('./internal/apply'),
+    assignInDefaults = require('./internal/assignInDefaults'),
+    assignInWith = require('./assignInWith'),
+    rest = require('./rest');
+
+/**
+ * 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`.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The destination object.
+ * @param {...Object} [sources] The source objects.
+ * @returns {Object} Returns `object`.
+ * @example
+ *
+ * _.defaults({ 'user': 'barney' }, { 'age': 36 }, { 'user': 'fred' });
+ * // => { 'user': 'barney', 'age': 36 }
+ */
+var defaults = rest(function(args) {
+  args.push(undefined, assignInDefaults);
+  return apply(assignInWith, undefined, args);
+});
+
+module.exports = defaults;