JavaScript Interview Questions

What Are the Primitive Types in JavaScript? How To Check the Type of a Variable?

What Is the Difference Between ==, === and Object.is in JavaScript?

What Is the Difference Between null, undefined and undeclared in JavaScript?

What is the Difference Between Map and Object in JavaScript, and Why Do We Need Map?

What Is the Difference Between Set, Map, WeakSet, and WeakMap in JavaScript?

What Will 0.1 + 0.2 Be in JavaScript? Why?

What Is the Purpose of "use strict" in JavaScript and What Are the Benefits of Using It?

What Is the Difference Between var, let and const in JavaScript?

What Is the Scope and Scope Chain of JavaScript?

What Is JavaScript Closure?

Explain what hoisting is in JavaScript

Different Ways of Iterating an Array in JavaScript? What Is the Difference Between Them?

In JavaScript Built-In Sort, When You Pass in (a, b) => b – a, How Will It Sort the Array? Why?’

What Is an Arrow Function in JavaScript? How Is It Different From a Regular Function?

What is an IIFE (Immediately Invoked Function Expression) in JavaScript? What are the Pros and Cons?

What Is a Higher-Order Function in JavaScript?

The Most Common JavaScript Prototype Interview Questions and Answers (prototype, prototypal inheritance, prototype chain)

What Is "this" in JavaScript?

Explaining the Concept of a Class in ES6 and the Distinction Between a Function Constructor

What Is JavaScript Promise? And How To Use It?

What Is an Event Loop in JavaScript?

The Most Common JavaScript Event Loop Interview Questions