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Concentrix Catalyst React Developer Interview Questions and Answers
Concentrix Catalyst React Developer Interview Experiences
1 interview found
Anonymous
I applied via Naukri.com and was interviewed in Jan 2023. There were 2 interview rounds.
(2 Questions)
- Q1. About you and your role in current organization? Given calculator model, 40-50 mins time need to design and develop using react? No questions were asked, directly gave model?
- Q2. No questions were asked
Interview Preparation Tips
Top trending discussions
Interview questions from similar companies
Selected
(5 Questions)
- Q1. HTML, CSS fundamentals
- Q2. Javascript event loop and array methods
- Q3. Javascript coding for operation on object array
- Q4. React benefits and Redux implementations
- Q5. How to create slice and combine reducers
(2 Questions)
- Q1. Questions based on projects, role, responsibilities and initiative at work place
- Q2. How to create and optimize a react application
(1 Question)
- Q1. Day to day activity of workplace and salary negotiation
Animesh Joshi
Normal js,react question
(2 Questions)
- Q1. Hooks, redux questions
- Q2. 1. what is hoisting, what is hoc, what is Debouncing.
- Ans.
Hoisting is the JavaScript mechanism where variable and function declarations are moved to the top of their containing scope. HOC stands for Higher Order Component, a pattern used in React for code reusability. Debouncing is a technique used to limit the rate at which a function is executed.
Hoisting moves variable and function declarations to the top of their scope during the compilation phase.
HOC is a function that ta...
Skills evaluated in this interview
I applied via Approached by Company and was interviewed in Apr 2024. There were 2 interview rounds.
Api call to fetch data and render
(1 Question)
- Q1. Normal discussion and negotiation
dinesh verma
(1 Question)
- Q1. React native easy questions
(1 Question)
- Q1. Talk about salary
I was interviewed in Oct 2021.
(4 Questions)
Round duration - 60 minutes
Round difficulty - Medium
Technical round with questions based on React JS.
- Q1. What are props in React?
- Q2. How does Redux work?
- Q3. What is Redux?
- Q4. What is the difference between Functional Components and Class Components in React?
Interview Preparation Tips
Tip 1 : Only react based questions were asked, so should have deep knowledge on important components of react.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
Skills evaluated in this interview
I applied via Naukri.com and was interviewed in Mar 2021. There was 1 interview round.
Interview Questionnaire
7 Questions
- Q1. What are the ways to handle Errors in React?
- Ans.
Error handling in React can be done using try-catch blocks, error boundaries, and handling asynchronous errors.
Use try-catch blocks to handle synchronous errors
Use error boundaries to catch errors in child components
Handle asynchronous errors using promises or async/await
Use third-party libraries like Sentry or Bugsnag for better error tracking
Display user-friendly error messages to improve user experience
- Q2. What are refs? How will you use it for getting input value? Explain with code.
- Ans.
Refs are a way to access DOM nodes or React components directly. They can be used to get input values.
Refs provide a way to access DOM nodes or React components directly.
They are commonly used to get input values or trigger imperative animations.
Refs can be created using the `createRef()` method or by using a callback function.
To get the value of an input using refs, you can assign a ref to the input element and access
- Q3. Explain useState, useEffect Hooks.
- Ans.
useState and useEffect are React Hooks used for managing state and side effects respectively.
useState is used to manage state in functional components
It returns an array with two elements - the current state value and a function to update the state
useEffect is used to manage side effects like fetching data or updating the DOM
It takes a function as its argument and runs it after every render
useEffect can also take a sec...
- Q4. What is Lazy Loading, Suspense. How do they work?
- Ans.
Lazy Loading and Suspense are techniques used to improve performance by loading components and data only when needed.
Lazy Loading delays the loading of non-critical resources until they are needed, reducing initial load time.
Suspense allows components to wait for data to load before rendering, improving user experience.
Lazy Loading and Suspense can be used together to optimize performance and user experience.
Example: A...
- Q5. How componentWillUnmount works?
- Ans.
componentWillUnmount is a lifecycle method in React that is called right before a component is unmounted and destroyed.
componentWillUnmount is used to perform any necessary cleanup tasks before a component is removed from the DOM.
It is commonly used to cancel any pending network requests, remove event listeners, or clear timers or intervals.
The method is called automatically by React when a component is about to be unm...
- Q6. How do you avoid re-rendering of a component? With useEffect second parameter, should ComponentUpdate
- Ans.
To avoid re-rendering, use shouldComponentUpdate or React.memo
Use shouldComponentUpdate to compare current and next props/state
Use React.memo to memoize functional components
Use useMemo to memoize expensive computations
Use useCallback to memoize event handlers
Use PureComponent for class components
- Q7. How to optimize React App? Important Question
Interview Preparation Tips
Skills evaluated in this interview
I applied via Approached by Company and was interviewed in Oct 2024. There were 2 interview rounds.
(1 Question)
- Q1. Explain hooks in react
- Ans.
Hooks are a new addition in React 16.8 that allow you to use state and other React features without writing a class.
Hooks are functions that let you use state and other React features in functional components.
useState() is a hook that allows you to add state to functional components.
useEffect() is a hook that allows you to perform side effects in functional components.
Custom hooks are reusable functions that can contai...
Create weather application in react native with unit test scripts
Interview Preparation Tips
Skills evaluated in this interview
rohit gadekar
(2 Questions)
- Q1. Write MySQL query to find employee with 2nd Highest salary
- Ans.
Use MySQL query with ORDER BY and LIMIT to find employee with 2nd highest salary.
Use ORDER BY salary DESC to sort salaries in descending order
Use LIMIT 1,1 to skip the highest salary and get the second highest salary
- Q2. What is branch in git
- Ans.
A branch in git is a separate line of development that allows you to work on features or fixes without affecting the main codebase.
Branches allow for parallel development
They can be created, switched between, merged, and deleted
Common branches include master, develop, feature branches, and release branches
Skills evaluated in this interview
(1 Question)
- Q1. Prev job exp details
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