HomeCoursesThe JavaScript Interview Handbook: 100+ Interview Questions

4.3

Intermediate

10h

The JavaScript Interview Handbook: 100+ Interview Questions

The ultimate guide to JavaScript interviews. Developed by FAANG engineers, practice with real-world interview questions, gain confidence, and get interview-ready in just a few hours.

Join 2.7M developers at

Overview

Content

Reviews

Preparing for coding interviews can be a long, arduous process. Many developers will tell you they spend countless hours grinding through hundreds of coding questions in order to feel confident. This course will help simplify the grind by showing you what topics to spend your time on and what questions you can expect within those topic areas. In this course you will focus on the fundamental concepts of JavaScript that interviewers expect you to know. You’ll practice interview questions related to: JS language basics, type coercion, event handling, asynchronous callbacks, and more. Throughout the course, you will gain hands-on experience through quizzes and challenges that will thoroughly test your understanding of the subject. Each question is accompanied by a detailed explanation of the solution that will further solidify your learnings. By the end of this course, you will have the confidence to go into an interview and answer any question that comes your way.

Preparing for coding interviews can be a long, arduous process. Many developers will tell you they spend countless hours grindin...Show More

Content

151 Lessons61 Quizzes36 Challenges

Introduction

2 Lessons

Get familiar with essential JavaScript concepts to ace frontend interviews.

About This Course

Evaluate Yourself

Language Basics

38 Lessons

Discover the logic behind JavaScript basics, including hoisting, closures, scope, and array manipulation.

Quiz: Hoisting

Solution Review: Hoisting

Challenge: Create an Amount

Solution Review: Create an Amount

Challenge: Check Parentheses

Solution Review: Check Parentheses

Quiz 1: Arrow Functions

Solution Review: Arrow Functions

Quiz 2: Arrow Functions

Solution Review: Arrow Functions

Challenge: Where to Insert

Solution Review: Where to Insert

Quiz: Call, Apply, Bind

Solution Review: Call, Apply, Bind

Quiz 1: Closure

Solution Review: Closure

JavaScript Execution: Call Stack & Event Loop

Immediately Invoked Function Expressions (IIFE)

Quiz: Closure, `setTimeout`, Scopes

Solution Review: Closure, `setTimeout`, Scopes

Quiz: Closure, `setTimeout`, IIFE

Solution Review: Closure, `setTimeout`, IIFE

Challenge: Create Phone Number

Solution Review: Create Phone Number

Challenge: Insert Elements

Solution Review: Insert Elements

Challenge: Bind Function

Solution Review: Bind Function

Quiz: Rest & Spread Syntax

Solution Review: Rest & Spread Syntax

Challenge: Destructuring

Solution Review: Destructuring

Challenge: Array Destructuring

Solution Review: Array Destructuring

Challenge: Return the Cat

Solution Review: Return the Cat

Challenge: Destructure Undefined

Solution Review: Destructure Undefined

Type coercion

20 Lessons

Break apart type coercion concepts using "typeof", "instanceof", prototypes, validation, and inheritance in JavaScript.

Event Handling

8 Lessons

Break down complex ideas in JavaScript event handling concepts and their interview applications.

Asynchronous Callbacks

16 Lessons

Map out the steps for understanding and solving asynchronous programming challenges with callbacks, promises, and async/await.

OOP in JavaScript

22 Lessons

Focus on understanding OOP in JavaScript through quizzes, challenges, and solution reviews.

Functional Programming

25 Lessons

Master functional programming concepts through practical quizzes, challenges, and in-depth solution reviews.

Security

6 Lessons

Step through key JavaScript security concepts such as same-origin policy, strict mode, and object manipulation protections.

DOM and Web Browser

14 Lessons

Walk through various DOM manipulation techniques and problem-solving challenges with hands-on JavaScript tasks.

Certificate of Completion

Showcase your accomplishment by sharing your certificate of completion.

Developed by MAANG Engineers

Every Educative lesson is designed by our in-house team of ex-MAANG software engineers and PhD computer science educators, and developed in consultation with developers and data scientists working at Meta, Google, and more. Our mission is to get you hands-on with the necessary skills to stay ahead in a constantly changing industry. No video, no fluff. Just interactive, project-based learning with personalized feedback that adapts to your goals and experience.

Trusted by 2.7 million developers working at companies

"These are high-quality courses. Trust me. I own around 10 and the price is worth it for the content quality. EducativeInc came at the right time in my career. I'm understanding topics better than with any book or online video tutorial I've done. Truly made for developers. Thanks"

Anthony Walker

@_webarchitect_

"Just finished my first full #ML course: Machine learning for Software Engineers from Educative, Inc. ... Highly recommend!"

Evan Dunbar

ML Engineer

"You guys are the gold standard of crash-courses... Narrow enough that it doesn't need years of study or a full blown book to get the gist, but broad enough that an afternoon of Googling doesn't cut it."

Software Developer

Carlos Matias La Borde

"I spend my days and nights on Educative. It is indispensable. It is such a unique and reader-friendly site"

Souvik Kundu

Front-end Developer

"Your courses are simply awesome, the depth they go into and the breadth of coverage is so good that I don't have to refer to 10 different websites looking for interview topics and content."

Vinay Krishnaiah

Software Developer

Hands-on Learning Powered by AI

See how Educative uses AI to make your learning more immersive than ever before.

Personalized Interview Prep

Skip the LeetCode grind with a custom roadmap that adapts to your goals. Hands-on practice for Coding Interviews, System Design, and more.

Mock Interviews

Test your skills in a simulated interview setting. Receive personalized feedback based on your performance. Available for Coding Interviews, System Design, and more.

AI Prompt

Build prompt engineering skills. Practice implementing AI-informed solutions.

Code Feedback

Evaluate and debug your code with the click of a button. Get real-time feedback on test cases, including time and space complexity of your solutions.

Explain with AI

Select any text within any Educative course, and get an instant explanation — without ever leaving your browser.

AI Code Mentor

AI Code Mentor helps you quickly identify errors in your code, learn from your mistakes, and nudge you in the right direction — just like a 1:1 tutor!

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