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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
Easy
24 votes3524 runs
2 comments
Easy
11 votes3996 runs
5 comments
Easy
11 votes3811 runs
3 comments
Hard
10 votes2256 runs3 comments
Easy
9 votes4020 runs0 comment
Medium
9 votes3857 runs
5 comments
Easy
9 votes3786 runs2 comments
Hard
9 votes2292 runs1 comment
Easy
7 votes3859 runs
2 comments
Hard
7 votes2367 runs0 comment

What will this code display?

Front-end developer
javascript
function
identity
Jean-marie Cléryat Jan 4, 2022
Hard
7 votes2309 runs0 comment

Invert a string in Javascript

Front-end developer
arrays
strings
Jean-marie Cléryat Jan 4, 2022
Easy
7 votes2289 runs0 comment
Medium
7 votes1485 runs3 comments
Easy
6 votes2739 runs
1 comment
Medium
6 votes2609 runs
1 comment