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CTS Consulting & Technical Support Reactjs Developer Interview Questions and Answers

Updated 25 Dec 2024

CTS Consulting & Technical Support Reactjs Developer Interview Experiences

1 interview found

Interview experience
3
Average
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(1 Question)

  • Q1. Props and state

Interview questions from similar companies

Interview experience
5
Excellent
Difficulty level
Easy
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Naukri.com and was interviewed in Dec 2022. There were 2 interview rounds.

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all tips
Round 2 - Technical 

(4 Questions)

  • Q1. Some of important javascript questions
  • Q2. On react js like hooks, virtual dom,html5 and html,state, useMemo, useCallback,useEffect
  • Q3. Box model, css selector
  • Q4. What are fragments in react js
  • Ans. 

    Fragments in React.js are used to group multiple elements without adding an extra node to the DOM.

    • Fragments are a way to group multiple elements without using a wrapper element.

    • They help in avoiding unnecessary divs in the DOM.

    • Fragments can improve performance by reducing the number of DOM nodes.

    • They are useful when returning multiple elements from a component's render method.

    • Fragments can be written using the

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - just prepare basic of front end technology like html,css,javascript,es6

Skills evaluated in this interview

Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
No response

I applied via LinkedIn and was interviewed in Oct 2024. There was 1 interview round.

Round 1 - Technical 

(3 Questions)

  • Q1. What are the advantages of React
  • Ans. 

    React offers advantages such as virtual DOM for improved performance, reusable components, and easy integration with other libraries.

    • Virtual DOM for efficient updates and improved performance

    • Reusable components for easier development and maintenance

    • Easy integration with other libraries like Redux for state management

    • Support for server-side rendering for better SEO performance

  • Answered by AI
  • Q2. How the performance optimization can be done in React Js Application
  • Ans. 

    Performance optimization in React Js can be achieved through code splitting, memoization, virtualization, and minimizing re-renders.

    • Implement code splitting to load only necessary components when needed

    • Use memoization techniques like useMemo and useCallback to prevent unnecessary re-renders

    • Implement virtualization for long lists or tables to render only visible items

    • Minimize re-renders by using shouldComponentUpdate or

  • Answered by AI
  • Q3. What is the purpose of useMemo and UseCallBack hook
  • Ans. 

    useMemo and useCallback are hooks in React used for optimizing performance by memoizing values and functions respectively.

    • useMemo is used to memoize the result of a function so that it is only recomputed when its dependencies change.

    • useCallback is used to memoize a function instance so that it is not recreated on every render unless its dependencies change.

    • Both hooks help in optimizing performance by preventing unneces...

  • Answered by AI

Skills evaluated in this interview

Reactjs Developer Interview Questions & Answers

TCS user image Samiksha Sajane

posted on 31 Jul 2024

Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(5 Questions)

  • Q1. Explain useSelector
  • Ans. 

    useSelector is a hook provided by React-Redux for accessing the Redux store state in functional components.

    • Allows functional components to access the Redux store state without connecting to the store

    • Accepts a selector function as an argument to specify which part of the state to extract

    • Automatically subscribes to the Redux store updates and re-renders the component when the selected state changes

  • Answered by AI
  • Q2. Optimization in react
  • Ans. 

    Optimization in React involves improving performance and efficiency of the application.

    • Use shouldComponentUpdate or PureComponent to prevent unnecessary re-renders

    • Avoid using inline functions in render method to prevent re-renders

    • Use keys in lists to help React identify which items have changed

    • Splitting components into smaller ones can improve performance

    • Use React.memo for functional components to memoize the result

  • Answered by AI
  • Q3. What is JSX in react
  • Ans. 

    JSX is a syntax extension for JavaScript used in React to write HTML-like code within JavaScript.

    • JSX allows developers to write HTML-like code directly in their JavaScript files

    • It makes the code more readable and easier to understand

    • JSX gets transpiled into regular JavaScript by tools like Babel before being rendered by the browser

  • Answered by AI
  • Q4. Explain redux flow in react
  • Ans. 

    Redux flow in React involves actions, reducers, store, and components to manage state in a centralized manner.

    • Actions are dispatched to describe what happened in the application.

    • Reducers specify how the state changes in response to actions.

    • Store holds the state of the application.

    • Components can connect to the store to access and update the state.

  • Answered by AI
  • Q5. Stateful and stateless components

Skills evaluated in this interview

Reactjs Developer Interview Questions & Answers

TCS user image Snehasis Chakraborty

posted on 7 Aug 2024

Interview experience
4
Good
Difficulty level
Easy
Process Duration
2-4 weeks
Result
Not Selected

I applied via Approached by Company and was interviewed in Jul 2024. There was 1 interview round.

Round 1 - One-on-one 

(3 Questions)

  • Q1. Brief about project
  • Ans. 

    Developed a web application for managing inventory and sales

    • Used Reactjs for front-end development

    • Implemented Redux for state management

    • Integrated with backend APIs using Axios

    • Designed responsive UI for better user experience

  • Answered by AI
  • Q2. Asked me about graph ql
  • Q3. Asked topic on routing .

Interview Preparation Tips

Interview preparation tips for other job seekers - please discuss the salary prior to giving interview .
Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(2 Questions)

  • Q1. Difference between if else and ternary
  • Ans. 

    Ternary operator is a shorthand for if else statement in JavaScript.

    • Ternary operator is written as condition ? expression1 : expression2

    • If the condition is true, expression1 is executed, else expression2 is executed

    • Ternary operator is more concise and can be used inline in JSX

  • Answered by AI
  • Q2. Class and functional components
Round 2 - Behavioral 

(2 Questions)

  • Q1. About my projects
  • Q2. About strenghts and weeknesses
Round 3 - HR 

(2 Questions)

  • Q1. About my experience
  • Q2. Salary discussions
Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - HR 

(1 Question)

  • Q1. Questions related to Current Job Profile and previous experience

I applied via Recruitment Consulltant and was interviewed in Mar 2022. There was 1 interview round.

Round 1 - Technical 

(6 Questions)

  • Q1. What is hoisting in JS
  • Ans. 

    Hoisting is a JavaScript behavior where variable and function declarations are moved to the top of their containing scope.

    • Hoisting applies to both variable and function declarations.

    • Variable declarations are hoisted but not their initializations.

    • Function declarations are fully hoisted, allowing them to be called before they are declared.

    • Hoisting does not apply to variables declared with let or const.

    • Hoisting can lead t...

  • Answered by AI
  • Q2. What are higher-order functions in JS
  • Ans. 

    Higher-order functions are functions that take one or more functions as arguments or return a function as their result.

    • Higher-order functions can be used to create reusable code by abstracting common patterns.

    • They enable functional programming paradigms like currying and composition.

    • Examples of higher-order functions in JavaScript include map, filter, and reduce.

  • Answered by AI
  • Q3. Difference between var, let, and const in JS
  • Ans. 

    var is function scoped, let and const are block scoped.

    • var can be redeclared and updated within its scope

    • let can be updated but not redeclared within its scope

    • const cannot be updated or redeclared once declared

    • let and const are not hoisted like var

    • const must be initialized during declaration

  • Answered by AI
  • Q4. What are Hooks in React.js
  • Ans. 

    Hooks are a feature in React.js that allow developers to use state and other React features in functional components.

    • Hooks are functions that let you use React features in functional components

    • They allow you to use state and other React features without writing a class

    • Hooks provide a way to reuse stateful logic between components

    • Some commonly used hooks are useState, useEffect, and useContext

  • Answered by AI
  • Q5. Presentation component vs functional component in React.js
  • Q6. Bind(), call(), apply() in JS

Interview Preparation Tips

Topics to prepare for Infosys Reactjs Developer interview:
  • JavaSctipt
  • React.Js
Interview preparation tips for other job seekers - the interview was based on basic concepts of JS.

Skills evaluated in this interview

Interview experience
1
Bad
Difficulty level
Moderate
Process Duration
2-4 weeks
Result
No response

I applied via Recruitment Consulltant and was interviewed in Nov 2023. There were 3 interview rounds.

Round 1 - Coding Test 

Progress bar in react and remote data fetching

Round 2 - Technical 

(1 Question)

  • Q1. Ui related questions
Round 3 - HR 

(1 Question)

  • Q1. Asked for preferred location and salary
Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
-

I applied via Company Website and was interviewed in Oct 2023. There were 3 interview rounds.

Round 1 - Technical 

(6 Questions)

  • Q1. What are the benefits of React?
  • Ans. 

    React offers a component-based architecture, virtual DOM for performance optimization, and a strong community support.

    • Component-based architecture allows for reusability and easier maintenance of code.

    • Virtual DOM helps in improving performance by only updating the necessary parts of the actual DOM.

    • React has a strong community support with a vast ecosystem of libraries and tools available.

    • React allows for server-side re...

  • Answered by AI
  • Q2. Difference between state and props?
  • Ans. 

    State is mutable and managed within the component, while props are immutable and passed from parent component.

    • State is managed within the component and can be changed using setState() method

    • Props are passed from parent component to child component and cannot be changed by the child component

    • State is used for internal component data management, while props are used for passing data from parent to child components

  • Answered by AI
  • Q3. What is useReducer and UseContext api?
  • Ans. 

    useReducer is a React hook that manages state changes through a specified reducer function. useContext is a hook that allows access to a context object.

    • useReducer is used for managing complex state logic in React applications.

    • It takes in a reducer function and an initial state, and returns the current state and a dispatch function.

    • Example: const [state, dispatch] = useReducer(reducer, initialState);

    • useContext is used f...

  • Answered by AI
  • Q4. What is one way data binding?
  • Ans. 

    One way data binding is a unidirectional flow of data from the model to the view in React applications.

    • Data flows from the model (or source of truth) to the view, but not vice versa.

    • Changes in the model automatically update the view, but changes in the view do not affect the model.

    • Helps in maintaining a clear and predictable data flow in React components.

  • Answered by AI
  • Q5. Tell me hooks you have used?
  • Ans. 

    I have used useState, useEffect, useContext, useReducer, and useRef hooks in my projects.

    • useState - for managing state in functional components

    • useEffect - for handling side effects in functional components

    • useContext - for accessing context in functional components

    • useReducer - for managing complex state logic in functional components

    • useRef - for accessing DOM elements or storing mutable values

  • Answered by AI
  • Q6. What is redux middleware
  • Ans. 

    Redux middleware is a function that intercepts actions before they reach the reducer.

    • Middleware can be used for logging, crash reporting, asynchronous API calls, etc.

    • It sits between the action dispatch and the reducer.

    • Examples of popular middleware include redux-thunk and redux-saga.

  • Answered by AI
Round 2 - Behavioral 

(2 Questions)

  • Q1. Questions related to Projects
  • Q2. Git commands: How to commit ,merge code, how to resolve merge conflicts
  • Ans. 

    Git commands for committing, merging code, and resolving merge conflicts

    • To commit code: git commit -m 'Commit message'

    • To merge code from a branch: git merge branch_name

    • To resolve merge conflicts: manually edit the conflicting files, add changes, and then commit the merge

  • Answered by AI
Round 3 - Coding Test 

It's 10 multiple-choice question with low,medium, and difficult range levels.

Skills evaluated in this interview

CTS Consulting & Technical Support Interview FAQs

How many rounds are there in CTS Consulting & Technical Support Reactjs Developer interview?
CTS Consulting & Technical Support interview process usually has 1 rounds. The most common rounds in the CTS Consulting & Technical Support interview process are Technical.

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CTS Consulting & Technical Support Reactjs Developer Interview Process

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Interview experience

3
  
Average
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