diff --git a/lib/browser/api/menu.js b/lib/browser/api/menu.js
index 9864e189b26c..3e56bea04b67 100644
--- a/lib/browser/api/menu.js
+++ b/lib/browser/api/menu.js
@@ -35,8 +35,8 @@ Menu.prototype._init = function () {
     },
     menuWillShow: () => {
       // Ensure radio groups have at least one menu item seleted
-      for (let id in this.groupsMap) {
-        let found = this.groupsMap[id].find(item => item.checked) || null
+      for (const id in this.groupsMap) {
+        const found = this.groupsMap[id].find(item => item.checked) || null
         if (!found) v8Util.setHiddenValue(this.groupsMap[id][0], 'checked', true)
       }
     }
@@ -222,11 +222,11 @@ function indexToInsertByPosition (items, position) {
 
   // compute new index based on query
   const queries = {
-    'after': (index) => {
+    after: (index) => {
       index += 1
       return index
     },
-    'endof': (index) => {
+    endof: (index) => {
       if (index === -1) {
         items.push({id, type: 'separator'})
         index = items.length - 1
@@ -245,11 +245,11 @@ function indexToInsertByPosition (items, position) {
 // insert a new MenuItem depending on its type
 function insertItemByType (item, pos) {
   const types = {
-    'normal': () => this.insertItem(pos, item.commandId, item.label),
-    'checkbox': () => this.insertCheckItem(pos, item.commandId, item.label),
-    'separator': () => this.insertSeparator(pos),
-    'submenu': () => this.insertSubMenu(pos, item.commandId, item.label, item.submenu),
-    'radio': () => {
+    normal: () => this.insertItem(pos, item.commandId, item.label),
+    checkbox: () => this.insertCheckItem(pos, item.commandId, item.label),
+    separator: () => this.insertSeparator(pos),
+    submenu: () => this.insertSubMenu(pos, item.commandId, item.label, item.submenu),
+    radio: () => {
       // Grouping radio menu items
       item.overrideReadOnlyProperty('groupId', generateGroupId(this.items, pos))
       if (this.groupsMap[item.groupId] == null) {