Questions
Type
Programming
UI Based
Quiz
Languages
JavaScript
HTML/CSS/JavaScript
React
Guides
Company Guides
Study Plans
Frontend System Design
More
Try a random question
Confused about where to start? Try a randomly selected question from our vast collection of interview questions.
All Questions
Resources
Collections
Video Tutorials
Pricing
Login
Explore premium tutorials by devtools.tech
Filters
How to create a flat version of a deeply nested array? [Programming Interview Question]
All Levels
JavaScript
14757
Solve
How to build a custom timer hook in React.js? | useTimer | JavaScript Interview Question
All Levels
React
15113
Solve
Build A Mini Clone Of Google Calendar | Frontend Coding Challenge | JavaScript Interview Questions | DevKode DOM Challenge
All Levels
HTML/CSS/JavaScript
React
10794
Solve
Implement Debounce Function | Flipkart UI - JavaScript Interview Questions
All Levels
JavaScript
7656
Solve
Implement Accordion Component in React.js | JavaScript Interview Question
Intermediate
React
9553
Solve
How to implement Event Emitter in JavaScript? | Facebook Interview Question
Intermediate
JavaScript
11022
Solve
How to implement DOM like structure tree!? | Frontend Interview Question | Advanced JavaScript
Advanced
JavaScript
6974
Solve
How to create OTP Input Component? | Frontend Coding Challege | JavaScript | HTML | CSS | React.js
Intermediate
HTML/CSS/JavaScript
React
7369
Solve
How to build a File Explorer? Atlassian Frontend Machine Coding Round Question | JavaScript Interview Question | React.js
Intermediate
React
HTML/CSS/JavaScript
16149
Solve
Build Country Capital Game | Microsoft Frontend Interview Question | JavaScript | React.js
All Levels
React
HTML/CSS/JavaScript
10219
Solve
What would be the return value (if any)?
Beginner
JavaScript
1044
Solve
What is the output of the following code snippet? | JavaScript Fundamentals | Frontend Interview Question
Beginner
JavaScript
6584
Solve
Can you identify the behaviour of following code snippet? | JavaScript Output Questions | Problem Solving | JavaScript Copy
Beginner
JavaScript
7818
Solve
Is Fetch API part of JavaScript Engine or JavaScript Runtime?
Beginner
JavaScript
6346
Solve
What would be the output of the following code? (Based on Spread Operator)
Beginner
JavaScript
6531
Solve
What would be the output of the following code? (Based on Array Slice)
Beginner
JavaScript
5188
Solve
Which function is used to serialize an object into a JSON string in Javascript?
Beginner
JavaScript
5088
Solve
What is the process in which an object or data structure is converted to series of bytes for easy storage or network transfer?
Beginner
JavaScript
4474
Solve
What will be the output of the following code snippet? JavaScript Min, Max
Beginner
JavaScript
4737
Solve
What is the use of the <noscript> tag in Javascript?
Beginner
HTML/CSS/JavaScript
4269
Solve
How the comparison happens with switch cases in JavaScript?
Beginner
JavaScript
4388
Solve
Which of the following keywords are used to define a variable in JavaScript?
Beginner
JavaScript
3336
Solve
What is the paradigm of JavaScript language?
Beginner
JavaScript
5483
Solve
What is the output of the following code? - Promise Scheduling | Event Loop | JavaScript Quiz
All Levels
JavaScript
10205
Solve
What does this function print? JavaScript Quiz | Interview Question
All Levels
JavaScript
7370
Solve
What is the output of the following code snippet? | JavaScript Fundamentals
Beginner
JavaScript
4421
Solve
What would be the output? [JavaScript Inheritance]
All Levels
JavaScript
5902
Solve
What would the output of the following code snippet? [Promises in JavaScript]
All Levels
JavaScript
11009
Solve
What would be the output of the following code? [Scoping in JavaScript]
All Levels
JavaScript
5906
Solve
What would be the output? [Object Destructuring]
All Levels
JavaScript
4536
Solve
What would be the output of the following code snippet? [Prototypes & Scopes]
Intermediate
JavaScript
4095
Solve
What would be the output of the following code snippet? [ES6 Classes]
All Levels
JavaScript
4531
Solve
What would be the output? [New Operator | Explicit Primitive Return]
Beginner
JavaScript
4469
Solve
What would be the output? [New Operator | Explicit Non Primitive Return]
Beginner
JavaScript
4200
Solve
What would be the output? (Different ways of Prototype calls)
All Levels
JavaScript
3836
Solve
What do you think would be the output? [HTML Collection | NodeList]
Intermediate
JavaScript
4632
Solve
What will be the output of the following code snippet? (in operator)
Beginner
JavaScript
6689
Solve
What is the output of the following? (Exotic Array Objects JavaScript)
Intermediate
JavaScript
4020
Solve
Switch Statement Output
Beginner
JavaScript
4212
Solve
Difference between Defer and Async keywords?
Beginner
HTML/CSS/JavaScript
4075
Solve
Back
Next
Study Guides
See all
Top JavaScript Array Interview Questions | Problem Solving | Array Polyfills
Frontend Coding Challenges | JavaScript | ReactJS | DevKode DOM Challenge
Top JavaScript Multiple Choice Questions (MCQ) with Answers | Frontend Interview Questions | Beginner Friendly
Advanced JavaScript Interview Questions | Problem Solving | Frontend Interview Questions
Top JavaScript Promises Interview Questions | Problem Solving | Promise Polyfills
Video Tutorials
See all
Frontend Debugging Techniques That Every Engineer Must Know | Understanding Git Bisect | Part 2
Frontend Debugging Techniques That Every Engineer Must Know | Part 1
JavaScript Promises Fundamentals Every Engineer Should Know | Part 1
JavaScript Promises Fundamentals Every Engineer Should Know | Part 2
What Every React Developer Should Know!? | Part 1 | Stale Closures
Contribution Opportunities
Share the best interview questions you've seen in past interviews with us!
Submit Questions
Grow with like-minded people,
Join the devtools.tech community
Stay in the know
Subscribe to our newsletter to stay up to date with all the latest content. No spam ever!
Subscribe
YouTube
Twitter