expriment: use lodash.assign instead of Object.assign

lib/theme/view.js

@@ -3,6 +3,7 @@
 const { dirname, extname, join } = require('path');
 const yfm = require('hexo-front-matter');
 const Promise = require('bluebird');
+const assign = require('lodash/assign');
 
 function View(path, data) {
   this.path = path;
@@ -61,7 +62,7 @@ View.prototype.renderSync = function(options = {}) {
 View.prototype._buildLocals = function(locals) {
   // eslint-disable-next-line no-unused-vars
   const { layout, _content, ...data } = this.data;
-  return Object.assign({}, locals, Object.getPrototypeOf(locals), data, {
+  return assign({}, locals, Object.getPrototypeOf(locals), data, {
     filename: this.source
   });
 };
@@ -70,8 +71,7 @@ View.prototype._bindHelpers = function(locals) {
   const helpers = this._helper.list();
   const keys = Object.keys(helpers);
 
-  for (let i = 0, len = keys.length; i < len; i++) {
-    const key = keys[i];
+  for (const key of keys) {
     locals[key] = helpers[key].bind(locals);
   }