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
What is the output of the following code snippet? | JavaScript Fundamentals | Frontend Interview Question
Beginner
JavaScript
4809
434
67
Solve
Can you identify the behaviour of following code snippet? | JavaScript Output Questions | Problem Solving | JavaScript Copy
Beginner
JavaScript
6192
316
177
Solve
Is Fetch API part of JavaScript Engine or JavaScript Runtime?
Beginner
JavaScript
5152
322
200
Solve
What would be the output of the following code? (Based on Spread Operator)
Beginner
JavaScript
5345
329
65
Solve
What would be the output of the following code? (Based on Array Slice)
Beginner
JavaScript
4065
220
109
Solve
Which function is used to serialize an object into a JSON string in Javascript?
Beginner
JavaScript
4024
277
38
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
3552
173
117
Solve
What will be the output of the following code snippet? JavaScript Min, Max
Beginner
JavaScript
3722
129
173
Solve
What is the use of the <noscript> tag in Javascript?
Beginner
HTML/CSS/JavaScript
3395
199
63
Solve
How the comparison happens with switch cases in JavaScript?
Beginner
JavaScript
3492
142
96
Solve
Which of the following keywords are used to define a variable in JavaScript?
Beginner
JavaScript
2471
167
2
Solve
What is the paradigm of JavaScript language?
Beginner
JavaScript
4404
180
69
Solve
What is the output of the following code? - Promise Scheduling | Event Loop | JavaScript Quiz
All Levels
JavaScript
8517
402
214
Solve
What does this function print? JavaScript Quiz | Interview Question
All Levels
JavaScript
6268
336
414
Solve
What is the output of the following code snippet? | JavaScript Fundamentals
Beginner
JavaScript
3499
74
129
Solve
What would be the output? [JavaScript Inheritance]
All Levels
JavaScript
4973
166
255
Solve
What would the output of the following code snippet? [Promises in JavaScript]
All Levels
JavaScript
9623
432
1166
Solve
What would be the output of the following code? [Scoping in JavaScript]
All Levels
JavaScript
4842
311
302
Solve
What would be the output? [Object Destructuring]
All Levels
JavaScript
3671
210
299
Solve
What would be the output of the following code snippet? [Prototypes & Scopes]
Intermediate
JavaScript
3242
260
74
Solve
What would be the output of the following code snippet? [ES6 Classes]
All Levels
JavaScript
3725
122
242
Solve
What would be the output? [New Operator | Explicit Primitive Return]
Beginner
JavaScript
3551
148
198
Solve
What would be the output? [New Operator | Explicit Non Primitive Return]
Beginner
JavaScript
3332
140
144
Solve
What would be the output? (Different ways of Prototype calls)
All Levels
JavaScript
3067
91
230
Solve
What do you think would be the output? [HTML Collection | NodeList]
Intermediate
JavaScript
3702
104
283
Solve
What will be the output of the following code snippet? (in operator)
Beginner
JavaScript
5613
339
909
Solve
What is the output of the following? (Exotic Array Objects JavaScript)
Intermediate
JavaScript
3316
208
206
Solve
Switch Statement Output
Beginner
JavaScript
3199
191
125
Solve
Difference between Defer and Async keywords?
Beginner
HTML/CSS/JavaScript
3256
215
76
Solve
What would be the output of the following code snippet? (Prototype method invocation)
Beginner
JavaScript
6196
270
1355
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
Contribution Opportunities
Share the best interview questions you've seen in past interviews with us!
Submit Questions
Premium Tutorials
Intermediate to Advanced programming content for your interview preparation and career growth.
Subscribe Now
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