Questions
Manasi Gupta
Senior Frontend Engineer
Useful and Effective
It made my interview preparation easy. With real questions from top companies and different levels, it's the perfect practice tool for any engineer.
Type
Programming
UI Based
Quiz
Languages
JavaScript
HTML/CSS/JavaScript
React
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
Submissions
Login
Filters
How to implement Array.prototype.push? JavaScript Interview Question | Problem Solving | JavaScript Polyfills
Beginner
JavaScript
2297
Solve
Is Fetch API part of JavaScript Engine or JavaScript Runtime?
Beginner
JavaScript
3237
202
134
Solve
What would be the output of the following code? (Based on Spread Operator)
Beginner
JavaScript
3488
199
46
Solve
What would be the output of the following code? (Based on Array Slice)
Beginner
JavaScript
2542
123
70
Solve
Which function is used to serialize an object into a JSON string in Javascript?
Beginner
JavaScript
2504
154
25
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
2211
92
104
Solve
What will be the output of the following code snippet? JavaScript Min, Max
Beginner
JavaScript
2298
58
99
Solve
What is the use of the <noscript> tag in Javascript?
Beginner
HTML/CSS/JavaScript
2133
119
40
Solve
How the comparison happens with switch cases in JavaScript?
Beginner
JavaScript
2087
83
56
Solve
Which of the following keywords are used to define a variable in JavaScript?
Beginner
JavaScript
1460
97
1
Solve
What is the paradigm of JavaScript language?
Beginner
JavaScript
2664
104
41
Solve
How to implement Array.prototype.pop? JavaScript Interview Question | Problem Solving | JavaScript Polyfills
Beginner
JavaScript
2019
Solve
How to implement Array.prototype.unshift? JavaScript Interview Question | Problem Solving | JavaScript Polyfills
Beginner
JavaScript
2682
Solve
Create a Progress Bar | Frontend Coding Challenge | DevKode DOM Challenge
Beginner
HTML/CSS/JavaScript
React
3172
Solve
Create a Color Spotter Game | Frontend Coding Challenge | DevKode DOM Challenge | JavaScript | HTML | CSS | ReactJS
Beginner
HTML/CSS/JavaScript
React
2840
Solve
Create a Chess Board | Frontend Coding Challenge | DevKode DOM Challenge | JavaScript | HTML | CSS | React
Beginner
HTML/CSS/JavaScript
React
2543
Solve
Create Pixel Art Grid | Frontend Coding Challenge | DevKode DOM Challenge
Beginner
HTML/CSS/JavaScript
React
2657
Solve
Implement Star Rating Widget | Frontend Coding Challenge | DevKode Challenge
Beginner
HTML/CSS/JavaScript
React
2576
Solve
How to implement Array.prototype.every? JavaScript Interview Question | Problem Solving | JavaScript Polyfills
Beginner
JavaScript
2351
Solve
How to implement Array.prototype.some? JavaScript Interview Question | Problem Solving | JavaScript Polyfills
Beginner
JavaScript
1437
Solve
How to implement Array.prototype.includes? JavaScript Interview Question | Problem Solving | JavaScript Polyfills
Beginner
JavaScript
2065
Solve
How to implement Array.prototype.lastIndexOf? JavaScript Interview Question | Problem Solving | JavaScript Polyfills
Beginner
JavaScript
1849
Solve
How to implement Array.prototype.findLastIndex? JavaScript Interview Question | Problem Solving | JavaScript Polyfills
Beginner
JavaScript
2193
Solve
How to implement Array.prototype.findLast? JavaScript Interview Question | Problem Solving | JavaScript Polyfills
Beginner
JavaScript
2323
Solve
How to implement Array.prototype.findIndex? JavaScript Interview Question | Problem Solving | JavaScript Polyfills
Beginner
JavaScript
1759
Solve
How to implement Array.prototype.find? JavaScript Interview Question | Problem Solving | JavaScript Polyfills
Beginner
JavaScript
2020
Solve
How to implement Array.prototype.at? JavaScript Interview Question | Problem Solving | JavaScript Polyfills
Beginner
JavaScript
1408
Solve
Design and Implement localStorage API | Frontend Problem Solving | JavaScript Interview Question
Beginner
JavaScript
3156
Solve
Implement Reduce Polyfill from Scratch | Frontend Problem Solving | JavaScript Interview Question
Intermediate
JavaScript
3456
Solve
How to implement a Developer Builder Interface? | Frontend Problem Solving | JavaScript Interview Question
Beginner
JavaScript
1369
Solve
Back
Next
Study guides
See all
Top Frontend Interview Questions from Major Product Companies
Asynchronous Programming Based Frontend Interview Questions
Lodash Based Frontend Interview Questions
Frontend Interview Experiences
Top DOM Based Interview Questions | JavaScript Problem Solving
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
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
Telegram
YouTube
Twitter
Unsure about your interview prep? Practice Mock Interviews with us!
Book Your Slot Now