diff --git a/javascript-practice/src/js/main.js b/javascript-practice/src/js/main.js
index 626a1f8..851ad8e 100644
--- a/javascript-practice/src/js/main.js
+++ b/javascript-practice/src/js/main.js
@@ -3,5 +3,6 @@ import App from './app';
 // Sure that scripts called after DOM loaded
 document.addEventListener('DOMContentLoaded', () => {
   const myApp = new App();
+
   myApp.start();
 });
diff --git a/javascript-practice/src/js/services/commonService.js b/javascript-practice/src/js/services/commonService.js
index 55c2415..934e78c 100644
--- a/javascript-practice/src/js/services/commonService.js
+++ b/javascript-practice/src/js/services/commonService.js
@@ -19,12 +19,14 @@ export default class CommonService {
       value,
     );
     const result = await timeOutConnect(existUser);
+
     return result;
   }
 
   async save(data, path = this.defaultPath) {
     this.connectToDb();
     const saveUser = this.firebaseService.save(data, path);
+
     await timeOutConnect(saveUser);
   }
 
@@ -32,7 +34,9 @@ export default class CommonService {
     this.connectToDb();
     const result = await this.firebaseService.getDataFromId(id, path);
     const data = await timeOutConnect(result);
+    
     if (data) return data;
+
     return null;
   }
 }
diff --git a/javascript-practice/src/js/services/userService.js b/javascript-practice/src/js/services/userService.js
index 556fe54..fa4147f 100644
--- a/javascript-practice/src/js/services/userService.js
+++ b/javascript-practice/src/js/services/userService.js
@@ -15,6 +15,7 @@ export default class UserService extends CommonService {
    */
   saveUser(user) {
     const pathData = this.defaultPath + User.createIdUser();
+
     this.save(user, pathData);
   }
 
@@ -34,9 +35,11 @@ export default class UserService extends CommonService {
    */
   async checkUserExist(email) {
     const userExist = await this.getUserIdByEmail(email);
+
     if (userExist) {
       return true;
     }
+
     return false;
   }
 
@@ -47,10 +50,13 @@ export default class UserService extends CommonService {
    */
   async getUserByEmail(email) {
     const id = await this.getUserIdByEmail(email);
+
     if (id) {
       const user = await this.getDataFromId(id);
+
       return new User(user);
     }
+
     return null;
   }
 
diff --git a/javascript-practice/src/js/views/registerView.js b/javascript-practice/src/js/views/registerView.js
index 3a26d6b..b0fb0c0 100644
--- a/javascript-practice/src/js/views/registerView.js
+++ b/javascript-practice/src/js/views/registerView.js
@@ -24,8 +24,10 @@ export default class RegisterView extends CommonLoginRegisterView {
 
     if (this.validateForm(account)) {
       const user = new User(account);
+
       return user;
     }
+
     return null;
   }