Front End Interview Questions

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(); CSS: 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 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

Mar 20, 2025 - 10:47

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();

CSS:

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
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