Nagarro React Js Frontend Developer Interview Questions and Answers

Q1. Object , array , ES6, React basics
Add your answer

Q1. Advance Javascript questions
Add your answer
Q2. React application with custom hooks
Ans. 
Custom hooks in React allow for reusable logic across components.
• Custom hooks are functions that use React hooks internally and can be reused across multiple components.

• They can encapsulate complex logic and state management, making components more modular and easier to maintain.

• Example: A custom hook for fetching data from an API and handling loading and error states can be used in multiple components.

• Example: A custo...read more
Answered by AI
Add your answer

Q1. Roles & Responsibilites
Add your answer

Q1. Types of Promises
Ans. 
Promises in JavaScript are objects representing the eventual completion or failure of an asynchronous operation.
• Promises can be in one of three states: pending, fulfilled, or rejected.

• Promises can be chained using .then() to handle success and .catch() to handle errors.

• Promises can be created using the Promise constructor or by using async/await syntax.
Answered by AI
Add your answer
Q2. Difference between useState and useEffect
Ans. 
useState is used to manage state in functional components, while useEffect is used to perform side effects in functional components.
• useState is used to declare state variables in functional components.

• useEffect is used to perform side effects in functional components, such as data fetching, subscriptions, or manually changing the DOM.

• useState does not trigger re-renders, while useEffect can be used to trigger re-render...read more
Answered by AI
Add your answer
Q3. What is Callback hell
Ans. 
Callback hell is a situation where multiple nested callbacks make the code difficult to read and maintain.
• Occurs when multiple asynchronous operations are nested within each other

• Leads to deeply nested code structure which is hard to understand

• Can be avoided by using Promises, async/await, or modularizing code
Answered by AI
Add your answer
Q4. Difference between traditional function and arrow function
Ans. 
Traditional functions are defined using the function keyword, while arrow functions are defined using a concise syntax with =>.
• Traditional functions are hoisted, while arrow functions are not.

• Arrow functions do not have their own 'this' keyword, they inherit it from the parent scope.

• Arrow functions are more concise and easier to read compared to traditional functions.

• Traditional functions are better for methods in obje...read more
Answered by AI
Add your answer
Q5. Usecase to create counter in react
Ans. 
Creating a counter in React to increment and decrement a value.
• Create a state variable to store the count value

• Use setState to update the count value

• Render the count value in the component

• Add buttons to increment and decrement the count value
Answered by AI
Add your answer
Q6. Program to find frequency of letters in a string
Ans. 
Program to find frequency of letters in a string
• Create an object to store the frequency of each letter

• Loop through the string and increment the count of each letter in the object

• Convert the object into an array of strings with letter and frequency pairs
Answered by AI
Add your answer
Q7. Program to find if substring is present in a given string without using predefined functions
Ans. 
Iterate through the given string to check if the substring is present.
• Iterate through the given string and check if each character matches the first character of the substring.

• If a match is found, check the subsequent characters to see if they form the substring.

• Return true if the entire substring is found within the given string, otherwise return false.
Answered by AI
Add your answer

Q1. Basic React question
Add your answer
Q2. Few Javascript questions
Add your answer

Q1. Tell me about your self
Add your answer

What is react , feature, axios, API

Redux Redux toolkit Redux thunk

Q1. Redux related questions
Add your answer
Q2. Css positioning including flex
Add your answer
Q3. Authorisation and authentication
Add your answer

Time base directions and probability

Q1. Self-introduction of yourself
Add your answer
Q2. Job description of the company why you need tp work in this company
Add your answer

Q1. Uncontrolled components
Add your answer
Q2. Why to use uncontrolled components instead of controlled
Add your answer