add book.js

node_modules/lodash/object/defaultsDeep.js

@@ -0,0 +1,25 @@
+var createDefaults = require('../internal/createDefaults'),
+    merge = require('./merge'),
+    mergeDefaults = require('../internal/mergeDefaults');
+
+/**
+ * This method is like `_.defaults` except that it recursively assigns
+ * default properties.
+ *
+ * **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
+ *
+ * _.defaultsDeep({ 'user': { 'name': 'barney' } }, { 'user': { 'name': 'fred', 'age': 36 } });
+ * // => { 'user': { 'name': 'barney', 'age': 36 } }
+ *
+ */
+var defaultsDeep = createDefaults(merge, mergeDefaults);
+
+module.exports = defaultsDeep;