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80 interview questions on Javascriptfor developers (2025)

Test your technical skills before an interview of Javascript with 80 corrected questions. Beginner, Intermediate or Expert level.

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80 questions
Hard
9 votes2222 runs3 comments
Hard
8 votes2259 runs1 comment
Hard
7 votes2270 runs0 comment

Invert a string in Javascript

Front-end developer
arrays
strings
Jean-marie Cléryat Jan 4, 2022
Easy
7 votes2261 runs0 comment
Hard
6 votes2334 runs0 comment

What will this code display?

Front-end developer
javascript
function
identity
Jean-marie Cléryat Jan 4, 2022
Hard
5 votes2267 runs1 comment
Hard
5 votes2228 runs0 comment

What will be the first thing that the following code displays?

Front-end developer
inheritance
prototype
constructor
Jean-marie Cléryat Jan 4, 2022
Hard
5 votes245 runs1 comment
Hard
4 votes2297 runs0 comment
Hard
4 votes2282 runs1 comment
Hard
4 votes2273 runs0 comment
Medium
4 votes2243 runs0 comment
Hard
3 votes2370 runs1 comment
Hard
3 votes2330 runs0 comment
Hard
3 votes2307 runs1 comment
Hard
3 votes2306 runs
1 comment
Hard
3 votes2251 runs0 comment

Explain the 2 phases of event propagation in the DOM.

Front-end developer
event
event propagation
Jean-marie Cléryat Jan 4, 2022
Hard
3 votes2227 runs1 comment

Write a module in Javascript

Front-end developer
module
pattern
Jean-marie Cléryat Jan 4, 2022
Hard
3 votes2221 runs0 comment