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138 interview questions on Javascriptfor developers (2025)

Test your technical skills before an interview of Javascript with 138 corrected questions. Beginner, Intermediate or Expert level.

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138 questions
Medium
23 votes3348 runs
2 comments
Easy
10 votes3833 runs
5 comments
Easy
10 votes3653 runs
3 comments
Hard
9 votes2194 runs3 comments
Easy
8 votes3856 runs0 comment
Medium
8 votes3678 runs
5 comments
Easy
8 votes3624 runs2 comments
Hard
8 votes2235 runs1 comment
Hard
7 votes2251 runs0 comment

Invert a string in Javascript

Front-end developer
arrays
strings
Jean-marie Cléryat Jan 4, 2022
Easy
7 votes2244 runs0 comment
Easy
6 votes3697 runs
2 comments
Medium
6 votes2501 runs
1 comment
Hard
6 votes2311 runs0 comment

What will this code display?

Front-end developer
javascript
function
identity
Jean-marie Cléryat Jan 4, 2022
Medium
6 votes1439 runs3 comments
Easy
5 votes2575 runs
1 comment