Wipro interview questions

Kalyan Venkatesh — Sat, 05 Apr 2025 11:37:43 +0000

roll out project how you have gathered information

can you perform SHDB for composite roles

what is function and what it contains

why we use BI and what is the use of analysis auth objects what is info cube info provider

when you are transporting composite role should we check the check box include single roles of composite every time

Front End Interview Questions

Kalyan Venkatesh — Thu, 20 Mar 2025 09:27:05 +0000

All the interview questions asked in front end interviews.

Javascript:

What are closures. can you explain where closures are helpful in javascript
look at the following code and check whether anything wrong in this code.

function isSomethisWrong() {
    let arrayList = new Array(1000000).fill("*");

    return function xyz() {
        console.log('closure funciton ')
    }
}

const somethingWentWrong = isSomethisWrong();

Web Services
Input validation
Make an array empty
Array methods
String methods
Number methods
Date methods
Array.sort
Asynchronous awaits
Promises
Es5 and Es6
Let const var
Scope
closure in JS
Variable Hoisting , function Hoisting, arrow functions,
Call, apply and bind
Convert date
Window methods
Document methods
Exponential in ES6
Event bubbling
Event capturing
Stop propagation
Stop immediate propagation
Type conversion
Math methods
Session storage and local storage and cookies
async await
Promises
Prototype chaining
Prototype
Callbacks
Callback hell
What are closures
What are event propogations, how to avoid it
q. Diff between stopPropogation and stopImmediatePropogation
What is the diff between array and array Map
q. Why should we use ArrayMap instead of an object
Why do we need to use forin and for each and when to use them instead of for loop
What is currying and why should I use it.
Difference between Array.prototype and __.prototype
What are premitive and non primitive data types
a. Why are they called primitive
What are constructors in javasceipt
a. How do you implement a constructor
We want to print a content of normal array, what loops will you use and why
When to for each, for in , for of and map looping ways
What are rest and spread operators
a. First array has simple numbers, If I create a second array using spread of first array. Is it shallow copy or deep copy? And why
What are promise Chains in javascript
input array is [1,2,3,4,5] , need output of 1,3,6,10,15
What is debouncing.
What is the diff between array and array Map Why should we use ArrayMap instead of an object
Why do we need to use forin and for each and when to use them instead of for loop
Difference between Array.prototype and __.prototype

function hoist() {
  let x = 100;
  if (true) {
    var x = 300;
  }
  console.log(x);
}
hoist();

What is the output of the following code snippet

function func2(){
  for(let i = 0; i < 3; i++){
    setTimeout(()=> console.log(i),2000);
} 
}

What should we modify if we want to print 1,2,3

what should be output of the following code snippet

const name = "sai";
age = 25
console.log(delete name)
console.log(delete age)

Modify the value of x in below snippet so that hello will be printed ( hint: x will be an object )

let x;


if(x==1 && x==2 && x==3){
  console.log("Hello");
}

TypeScript:

which file should we touch to modify settings of typescript
what can we modify in tsconfig file
How typescript help us?

HTML

HTML form input elements
Semantics HTML elements
Block , inline block , inline difference
what is the difference between div and section
Given an HTML , how to modify style of a particular element using pure javascripta) and by any chance modify the second text of the content.

CSS:

Different types of position
Explain position absolute vs relative
What is media query
Margin: 0 auto
Pseudo classes
Links modifications link ,visited,over,active
Box modal
Padding negative not able to give
how to remove sharp corner
Css3 different
Less and sass
Center align a div in HTML
Pre tag to give proper space
What are pseudo classes / pseudo elements
How does flexbox and grid help us
How we implement responsive ness in css
Any idea of tailwind css
what are mixins in css. how to use it

GIT:

how do you create a PR
what are the best practices you in your day to day work activities
What is the difference between git pull and git fetch
a) Doesn't git pull takes the latest changes on parent branch? then
what is the need of taking git fetch

Rest APIs

What are the Rest API implementations you have done
How do you implement REST API integration in react application
Difference between axios and fetch
How do you cancel the ongoing request
How do you make multiple API request at a time
How do you make repeated API request
How do you implement real time data handling like fetching stocks related real time data
interceptor
How to implement geting freqeunt changes to the front end

React JS:

Have you worked on react grids.
What are the REST API implementations you have done
There are thousands of records with nested data. How do you implement displaying the data in react grid with less loading time
Have you used Implementing Suspense
How do you implement error boundaries in React
What is useEffect Hook and what will happen
a ) if you dont pass any dependency list
b) if you pass empty dependency list
c) If you pass any dependencies
If you face any issues in data fetching using any API, How do you convey the same to the user in a smooth way.
what are session based authentication and token based authentications and when should we choose them.
Can we use POST insted of PUT to update any data.
How do you do debugging in react
what are state and props
what are hooks
Server side rendering in react
how to update state in react
what is context in react
How do you implement error boundaries
Have you implemented suspense in react
What are session based authentication and token based authentications
Router
Controlled router
In what scenarios components will re render
What is a synthetic event in react
Browser cache and application cache
React service handlers
What are controlled and uncontrolled components
How do you pass data from parent to child
What will happen if you pass any function handlers from parent to child
What are error boundaries
a. How do you implement them
How to implement life cycle methods in functional components
For memorising props what key word should we use3. For memorising function handlers
There are huge records and how would you implement to show only few records at a time and fetch remaining records on scroll. a) event throttling. The concept is event throttling. How would you implement.
what are custom hooks, what is the necessity of creating a custom hook
what are the differences between useEffect , useMemo and useCallback
what is architecture of react? have you heard of FLUX?
how do you handle errors while performing APIs in your application?
what are different routing patterns
How does useContext works
What are the life cycle methods of class based components
Implement a star rating implementation
what are the different ways to handle asynchronous operations
if you want to develop an application, what would you keep in mind while developing
what are the design patters we follow in developing application
how will you analyse whether any application has broken
How would you implement an error boundary . if the same can be implemented by a loader, why should we go for error boundary
React DOM
When should we use functional components and when should we use class based components
what are the differences between functional and class based components
when should we use ref
React.comp nd react.purecomp
React service handlers
Is React an imperative or declarative framework.
What is difference between React Element and React Component
How do you write a custom React Element
How to implement Protected routes in React JS.
What are memory leaks in React JS

What is the output of the following jsx.

let user = {
  name: "React",
  version: "16"
}
function App(){
    return <h1>{user.name && `Welcome ${user.name}` && 'Hello' }</h1>;
}

Redux

What is Redux
Principles of Redux
Explain Redux flow
how can we write lifecycle methods in react
context vs redux
why cant we use context instead of redux

Redux saga

What is redux thunk
What is redux saga
where does middle ware fits in state management
what will happen if we don't use middleware

Useful Resources

https://github.com/sudheerj/javascript-interview-questions

https://github.com/cheatsheet1999/FrontEndCollection?tab=readme-ov-file

https://learnersbucket.com/

https://javascript.plainenglish.io/front-end-system-design-guide-9a11381f5e81

https://www.patterns.dev/

Forem: Kalyan Venkatesh

Wipro interview questions

Front End Interview Questions