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Wipro Reactjs Developer Interview Questions, Process, and Tips
Top Wipro Reactjs Developer Interview Questions and Answers
- Q1. what are the new features in react 16?
- Q2. What is closures, Hoisting with example Semantic elements
- Q3. why react hooks are use full?
Wipro Reactjs Developer Interview Experiences
3 interviews found
Anonymous
I applied via Recruitment Consulltant and was interviewed in Nov 2023. There were 3 interview rounds.
Progress bar in react and remote data fetching
(1 Question)
- Q1. Ui related questions
(1 Question)
- Q1. Asked for preferred location and salary
I applied via Naukri.com and was interviewed in Apr 2022. There was 1 interview round.
(3 Questions)
- Q1. What is closures, Hoisting with example Semantic elements
- Ans.
Closures and hoisting are important concepts in JavaScript.
Closures refer to the ability of a function to access variables in its outer scope even after the function has returned.
Hoisting is the behavior of moving variable and function declarations to the top of their respective scopes.
Example of closures: function outer() { let x = 10; function inner() { console.log(x); } return inner; } const innerFunc = outer(); inn...
- Q2. Chaining Methods Currying Call bind and apply Optimization of application Server side rendering
- Q3. Selectors HTML 5 features
Interview Preparation Tips
Practice for scope of variables inside and outside of functions
Interview Questionnaire
3 Questions
- Q1. What are the new features in react 16?
- Ans.
React 16 introduced new features like React Fiber, Error Boundaries, Portals, and improved server-side rendering.
React Fiber is a new reconciliation engine that improves performance and enables incremental rendering.
Error Boundaries allow developers to catch and handle errors in components.
Portals provide a way to render children into a different DOM subtree.
Improved server-side rendering with support for streaming and...
- Q2. Why react hooks are use full?
- Ans.
React hooks simplify state management and lifecycle methods in functional components.
Hooks allow functional components to have state and lifecycle methods
They reduce the need for class components and HOCs
Hooks make code more readable and easier to test
Examples of hooks include useState, useEffect, and useContext
- Q3. What is HOC components?
- Ans.
HOC components are higher-order components in React that allow code reuse and logic sharing.
HOC components are functions that take a component and return a new component with additional functionality.
They are used to abstract common logic and behaviors into reusable components.
HOC components can be used for tasks like authentication, logging, and code reuse.
Example: a withAuth HOC component that adds authentication log
Skills evaluated in this interview
What people are saying about Wipro
Interview questions from similar companies
Selected
I applied via Recruitment Consulltant and was interviewed in Oct 2024. There were 2 interview rounds.
(5 Questions)
- Q1. Component lifecycle
- Q2. What is DOM tree?
- Ans.
DOM tree is a hierarchical representation of HTML elements in a web page.
DOM stands for Document Object Model.
It is a tree-like structure where each node represents an HTML element.
The DOM tree is created by the browser when a web page is loaded.
It allows JavaScript to manipulate the content, structure, and style of a web page.
- Q3. What is the difference between props and state?
- Ans.
Props are immutable and passed from parent component, while state is mutable and managed within the component.
Props are read-only and cannot be modified by the component receiving them.
State is mutable and can be changed by the component that owns it.
Props are passed from parent to child components, while state is managed within the component itself.
Example: Props can be used to pass data from a parent component to a c...
- Q4. What is redux and when to use it and when not to use it?
- Ans.
Redux is a predictable state container for JavaScript apps. It is used to manage application state in a centralized way.
Use Redux when you have complex state management needs in your application.
Redux is helpful for large applications with many components that need access to the same state.
Avoid using Redux for simple applications with minimal state management requirements.
Consider using React's built-in state manageme...
- Q5. Two arrays passed to one function, then remove the elements passed from source array and present in another array
- Ans.
Remove elements from source array present in another array passed to a function
Loop through elements in source array and check if they exist in the other array
If an element is found in both arrays, remove it from the source array
(5 Questions)
- Q1. What is DOM tree
- Ans.
DOM tree is a hierarchical representation of HTML elements in a web page.
DOM stands for Document Object Model
It is a tree-like structure where each node represents an HTML element
The root node is the element, followed by
and elementsNodes can have parent-child relationships, siblings, and descendants
JavaScript can manipulate the DOM to dynamically update the content and structure of a web page
- Q2. What are lifecycle methods of react? How we can achieve same in functional components?
- Ans.
React lifecycle methods are methods that are invoked at different stages of a component's life cycle.
Some lifecycle methods include componentDidMount, componentDidUpdate, componentWillUnmount, etc.
In functional components, we can achieve similar functionality using useEffect hook.
For example, useEffect with an empty dependency array can mimic componentDidMount, while useEffect with dependencies can mimic componentDidUp
- Q3. What is redux? Explain its architecture.
- Ans.
Redux is a predictable state container for JavaScript apps.
Redux is a state management library commonly used with React.
It helps in managing the state of the application in a predictable way.
Redux follows a unidirectional data flow architecture.
Actions are dispatched to update the state, which is stored in a single immutable state tree.
Reducers are pure functions that specify how the state should change in response to
- Q4. When do we use any in typescript?
- Ans.
The 'any' type in TypeScript is used when the type of a variable is not known during development.
Use 'any' when working with dynamic data types or when the type cannot be determined at compile time.
Avoid using 'any' as much as possible to maintain type safety and improve code quality.
Consider using 'unknown' type instead of 'any' for better type checking and error prevention.
- Q5. What is the checklist for improving performance of React application?
- Ans.
Checklist for improving performance of React application
Use React.memo or PureComponent for optimizing rendering
Avoid unnecessary re-renders by using shouldComponentUpdate or React.memo
Use code splitting to load only necessary components
Optimize state management with libraries like Redux or Context API
Minimize the use of inline styles and prefer CSS stylesheets for better performance
Skills evaluated in this interview
(2 Questions)
- Q1. React basic,event loop, Lazy Loading, Suspense, Javascript basics
- Q2. Create counter application
- Ans.
Counter application using Reactjs
Create a React component for the counter
Use state to keep track of the count
Implement functions to increment and decrement the count
Display the count on the screen
I applied via Naukri.com and was interviewed in Nov 2024. There was 1 interview round.
(2 Questions)
- Q1. Technical and optimization techniques related
- Q2. Coding questions of java script
anjali rastogi
(1 Question)
- Q1. What is client side and server side rendering
(2 Questions)
- Q1. What do you mean by redux and how to use redux
- Ans.
Redux is a predictable state container for JavaScript apps. It helps manage the state of an application in a more organized way.
Redux is a state management tool commonly used with React to manage the state of an application.
It follows a unidirectional data flow, where the state is stored in a single store.
Actions are dispatched to update the state, and reducers specify how the state should change in response to actions...
- Q2. What is the use of Context Api in React
- Ans.
Context API is used in React to pass data through the component tree without having to pass props down manually at every level.
Avoids prop drilling by providing a way to share values like themes, user data, etc. across the component tree.
Helps in managing global state in React applications.
Context API consists of Provider and Consumer components to provide and consume the context data.
Can be used for theming, localizat
Skills evaluated in this interview
Niharika Thakur
I applied via Company Website and was interviewed in Jun 2024. There were 2 interview rounds.
Got a link on mail to give online clearance test. 25 questions on react, Js and html-css
(1 Question)
- Q1. Build a login page
vaibhav chakane
(3 Questions)
- Q1. Javascript array methods like filter and reduce. Javascript guess the output questions based on variables and functions.
- Q2. React lifecycle methods
- Q3. UseState and useEffect usecase
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