TCS React.js Interview Questions

I recently appeared for a React.js / Frontend Developer interview at TCS.

The interview was mainly focused on real-world scenarios, project experience, and problem-solving rather than only theoretical questions.

I’m sharing some of the questions that were asked. These may help others who are preparing for React.js interviews.

Project Discussion

  • Explain your current project and your responsibilities.
  • How is your application structured from frontend to backend?
  • How do different modules communicate with each other?
  • Tell me about a production issue you faced and how you fixed it.

React.js Questions

  • If changing one filter causes the whole page to re-render, how would you find and fix the issue?
  • How would you manage a large form with multiple sections and validations?
  • How would you prevent users from clicking Submit multiple times and creating duplicate API requests?
  • For a real-time dashboard, would you use polling or WebSockets? Why?
  • If a React component has become 1,000+ lines, how would you break it into smaller components?

JavaScript & API Questions

  • You have 5 APIs that need to run before displaying a page. How would you handle them?
  • If 1 API fails but the other 4 succeed, how would you handle the error?
  • If an API returns thousands of records, would you load everything on the frontend? What would you do instead?

Performance Questions

  • If a React application's Lighthouse score is poor, what would you check first?
  • If a JavaScript function is causing UI lag, how would you find and optimize it?

Coding & Problem Solving

The coding discussion was more about how I approach a problem rather than just writing code.

The main areas were:

  • Problem-solving approach
  • Edge cases
  • Time and space complexity
  • Code readability
  • Production-level improvements

My Takeaway

The main takeaway for me was that for a senior React.js role, it's important to know how things work in real projects, not just React concepts.

So, while preparing for interviews, focus on real-world scenarios, performance, API handling, debugging, and clean code.

Hope this helps someone preparing for their next React.js interview. 🚀

#ReactJS #ReactInterview #JavaScript #FrontendDeveloper #TCS #InterviewExperience #CodingInterview

Comments

Post a Comment

Popular posts from this blog

Add Css And Js Files on Specific Page In laravel

  1. Using Blade Layout Sections: Laravel's Blade templating engine provides a powerful way to manage layouts and include specific content on different pages. Here's how to achieve this: a. Base Layout ( layouts/app.blade.php ): <!DOCTYPE html> <html> <head> <title>My Website</title> @yield('page-css') <link rel="stylesheet" href="{{ asset('css/app.css') }}"> </head> <body> @include('partials.header') <main>@yield('content')</main> @include('partials.footer') @yield('page-js') <script src="{{ asset('js/app.js') }}"></script> </body> </html> b. Specific Page View ( views/home.blade.php ): @extends('layouts.app') @section('content')   @endsection @section('page-css')   <link rel="stylesheet" href="{{ asset('css/home.css') }}">  @endsection @se...
Read more

Be 10x 10 tools from sessions

 gamma.app  create ppt paywallhub.com sci-hub.se ui.playground.ai  for creating images with prompt  app.yoodli.ai   for job search resume practice for your speech ChatGPT codedamn.com/ai    help to find out the bug in your code Gemini formula.dog creates the formula for Excel
Read more

Send email by Outlook in php Mailer

1. Enable Less Secure Apps Access (Not Recommended - Security Risk): Warning: This approach is generally not recommended due to security concerns. It allows access from any less secure app, including potentially malicious ones. Consider alternative methods (2 or 3) if possible. Sign in to your Microsoft account and navigate to Security Settings:  https://account.microsoft.com/account/manage-my-account Under "Advanced Security," select "Turn on two-step verification" (recommended for overall account security). Then, enable "Less secure apps" access ( use with caution ). 2. Use an App Password (Recommended): Generate an app password specifically for PHPMailer in your Microsoft account security settings. This password will be used in place of your regular Outlook password for enhanced security. 3. Configure PHPMailer: PHP <?php require 'vendor/autoload.php' ; // Assuming you have Composer installed use PHPMailer \ PHPMailer \ PHPMailer ; ...
Read more