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MC 0.387 · 6 Nov 2026, 20:47 EST

JavaScript Interview Questions - DevSocial

DevSocial Interviews · JavaScript

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Interview questions developers were asked, with answers from the community. 6,385 of them have an answer.

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Questions: 8,687
Answered: 6,385
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JavaScript · Newest · 81 questions

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81 questions in JavaScript. Clear

How does async/await work under the hood?
JavaScript

Manav Pandya

Jul 22, 20252,086

Differentiate between call, apply and bind of Java

Prarthana Bhat

Prarthana BhatDec 8, 2024640

What is the difference between ECMA Script and Javascript?

Ayush Gupta

Ayush GuptaSep 11, 20241,059

What is different between normal function and arrow function in javascript?

Alpesh Maniya

Alpesh ManiyaJan 17, 20241,199

What are the data types in javascript ?

Chintan Malvaniya

Chintan MalvaniyaNov 21, 20231,652

Discuss the differences between for...of and for...in when iterating over objects.

Tuhin Paul

Tuhin PaulNov 11, 2023999

What is the difference between = , == and === in javascript?

Chintan Malvaniya

Chintan MalvaniyaNov 1, 20231,302

What is closure in JavaScript?

Manoj Kumar Duraisamy

Manoj Kumar DuraisamyJun 20, 20232,004

How can you pass n arguments in any JavaScript function?

Shivangi Rajde

Shivangi RajdeJun 8, 20231,420

What is are array and set in javascript ? What are difference between them ?

Sourabh Sharma

Sourabh SharmaApr 2, 20231,168

What's the difference between a variable that is: null, undefined or undeclared? How would you go about checking for any of these states?

Arvind Yadav

Arvind YadavMar 23, 20223,330

Explain what is Hoisting in Javascript

Arvind Yadav

Arvind YadavMar 23, 20222,638

Explain the Prototype Design Pattern

Arvind Yadav

Arvind YadavMar 23, 20221,932

Can you describe the main difference between a .forEach loop and a .map() loop and why you would pick one versus the other?

Arvind Yadav

Arvind YadavMar 23, 20222,448

When should we use generators in ES6?

Arvind Yadav

Arvind YadavMar 23, 20221,991

When should I use Arrow Functions in ES6?

Arvind Yadav

Arvind YadavMar 23, 20221,846

What's a typical use case for anonymous functions?

Arvind Yadav

Arvind YadavMar 23, 20222,006

What is generator in JS?

Arvind Yadav

Arvind YadavMar 23, 20221,453

What are the differences between ES6 class and ES5 function constructors?

Arvind Yadav

Arvind YadavMar 23, 20222,134

What is first class, higher order, and callbacks in javascript?

Prakshal Shah

Prakshal ShahFeb 13, 20222,006

Difference between call Apply and Bind function in javascript? explain with example

Abhishek Addu

Abhishek AdduAug 31, 202111,457

JavaScript is "Synchronous" or "Asynchronous" program? Why?

Ganesan C

Ganesan CAug 17, 20212,957

Difference between Promise.race vs Promise.any

Ganesan C

Ganesan CAug 13, 20215,217

What is closure in JavaScript and example? What is use of closure?

Ganesan C

Ganesan CAug 12, 20211,591

What is hoisting in JavaScript? Explain with an example.

Pranam Bhat

Pranam BhatAug 11, 20211,537

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