Walstar Technologies Front end Developer Interview Questions and Answers

Q1. Create a Todo app
Ans. 
A simple Todo app to manage tasks and deadlines
• Create a form to add new tasks

• Display a list of tasks with checkboxes to mark as complete

• Include options to edit or delete tasks

• Implement functionality to mark tasks as complete or incomplete

• Add a feature to filter tasks by status (completed/incomplete)
Answered by AI
Add your answer
Q2. Lifecycle methods
Add your answer

Q1. React Hooks and Project experience
Add your answer

Q1. Performance Optimization Techniques
Ans. 
Performance optimization techniques for React JS frontend development
• Use React.memo for optimizing functional components

• Avoid unnecessary re-renders by using shouldComponentUpdate or PureComponent for class components

• Implement code splitting to reduce initial load time

• Use lazy loading for components that are not immediately needed

• Optimize images and assets for faster loading times

• Minimize the use of inline styles and u...read more
Answered by AI
Add your answer
Q2. Lazy Loading and other ques related to that
Add your answer

Q1. General HR Interview
Add your answer

Mostly questions are start pattern related

Q1. Tell me about yourself
Ans. 
I am a passionate React Js developer with 5 years of experience in building user-friendly and responsive web applications.
• 5 years of experience in React Js development

• Strong knowledge of HTML, CSS, and JavaScript

• Experience in building responsive web applications

• Passionate about creating user-friendly interfaces
Answered by AI
Add your answer
Q2. Why do you want to join this company?
Ans. 
I am impressed by the company's innovative projects and collaborative work culture.
• I admire the company's commitment to pushing boundaries in technology.

• I am excited about the opportunity to work with a talented team of developers.

• I believe my skills and experience align well with the company's goals and values.
Answered by AI
Add your answer

Decent questions asked in the online mcq test

Q1. Redux vs context API
Ans. 
Redux is a predictable state container for JavaScript apps, while Context API is a feature in React for passing data through the component tree.
• Redux is more suitable for larger applications with complex state management needs.

• Context API is simpler to use and is built into React, reducing the need for additional libraries.

• Redux provides a single source of truth for the application state, making it easier to debug and ...read more
Answered by AI
Add your answer

Given the task to complete page design.

Q1. Explain event Loop
Ans. 
Event loop is a mechanism in JavaScript that allows for asynchronous operations to be executed in a non-blocking way.
• Event loop is responsible for handling asynchronous operations in JavaScript.

• It continuously checks the call stack and the callback queue to see if there are any tasks to be executed.

• Tasks from the callback queue are moved to the call stack for execution when the call stack is empty.

• Event loop ensures th...read more
Answered by AI
Add your answer
Q2. Explain React Hooks
Ans. 
React Hooks are functions that let you use state and other React features without writing a class.
• React Hooks were introduced in React 16.8.

• They allow you to use state and other React features in functional components.

• Some commonly used React Hooks are useState, useEffect, useContext, etc.

• Hooks are more readable and easier to maintain compared to class components.
Answered by AI
Add your answer

Q1. Create a Todo app
Ans. 
A simple Todo app to manage tasks and deadlines
• Create a form to add new tasks

• Display a list of tasks with checkboxes to mark as complete

• Include options to edit or delete tasks

• Implement functionality to mark tasks as complete or incomplete

• Add a feature to filter tasks by status (completed/incomplete)
Answered by AI
Add your answer
Q2. Lifecycle methods
Add your answer

Focused on JS questions

Q1. React concept explain
Ans. 
React is a JavaScript library for building user interfaces.
• React is a declarative, efficient, and flexible JavaScript library for building user interfaces.

• It allows developers to create reusable UI components.

• React uses a virtual DOM to improve performance by only updating the necessary parts of the actual DOM.

• React follows a unidirectional data flow, making it easier to understand how data changes over time.

• React can ...read more
Answered by AI
Add your answer