JavaScript Interview Questions
Preparing for a job interview requires studying to refresh your knowledge and skills. This collection of JavaScript interview questions is designed to cover some commonly-asked interview questions, using concise answers and simple examples.
How do I compare two arrays in JavaScript?
Learn how you can compare two arrays in JavaScript using various different techniques.
JavaScript, Array · Sep 27, 2021
How can I check if a JavaScript array includes a specific value?
Checking if an array includes a specific value is pretty straightforward, except when it comes to objects.
JavaScript, Array · Sep 18, 2022
What is the difference between Array.prototype.map() and Array.prototype.forEach()?
Which method do you reach for first? What are the differences between them? Let's find out!
JavaScript, Array · Mar 26, 2023
Understanding event bubbling, capturing and delegation in JavaScript
Understand how events work in JavaScript and learn when to use event bubbling, event capturing and event delegation with this short guide.
JavaScript, Browser · Jun 12, 2021
What is the only value not equal to itself in JavaScript?
Did you know there's a JavaScript value that's not equal to itself?
JavaScript, Type · Dec 12, 2021
How can I check for a blank value in JavaScript?
JavaScript doesn't have a built-in way to check if a value is blank, but it's easy to create one.
JavaScript, Type · Sep 25, 2022
Are JavaScript strings immutable?
When it comes to immutability, JavaScript strings are often a source of confusion. Yet they're not as complicated as you might expect.
JavaScript, String · Oct 10, 2021
What is the difference between static and instance methods?
Static and instance methods are pretty easy to distinguish and serve different purposes. Learn all about them in this article.
JavaScript, Object · Jan 30, 2022
Introduction to arrow functions in JavaScript
JavaScript arrow functions are a very useful tool to learn and master. Here's a complete introduction to everything you need to know.
JavaScript, Function · Jun 12, 2021
What is a pure function?
Pure functions are a very important concept to know, especially if you're interested in functional programming.
JavaScript, Function · Dec 19, 2021
What is recursion and when is it useful?
Recursion is a very important programming concept all developers should be familiar with.
JavaScript, Function · Jan 23, 2022
What does 'use strict' do and what are some of the key benefits to using it?
JavaScript's strict mode can make your code faster, cleaner and more secure.
JavaScript, Function · Nov 28, 2021
What is the difference between async and defer in script loading?
Understanding how to correctly load your JavaScript files can significantly improve your web application's performance.
HTML, Script · Sep 4, 2022
What are JavaScript closures?
Learn and understand closures, a core concept in JavaScript programming, and level up your code.
JavaScript, Function · Jun 12, 2021
What is an IIFE in JavaScript?
An Immediately Invoked Function Expression (IIFE) is a JavaScript trick that trips up many developers. Here's what you need to know.
JavaScript, Function · Jun 14, 2021
