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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
27 votes3656 runs
2 comments
Easy
11 votes4114 runs
5 comments
Easy
11 votes3921 runs
3 comments
Easy
11 votes3898 runs2 comments
Easy
10 votes4139 runs0 comment
Hard
10 votes2291 runs3 comments
Medium
9 votes3981 runs
5 comments
Hard
8 votes2329 runs
2 comments
Easy
7 votes3976 runs
2 comments
Easy
7 votes2855 runs
1 comment
Medium
7 votes2684 runs
1 comment
Hard
7 votes2403 runs0 comment

What will this code display?

Front-end developer
javascript
function
identity
Jean-marie Cléryat Jan 4, 2022
Hard
7 votes2350 runs
1 comment

Invert a string in Javascript

Front-end developer
arrays
strings
Jean-marie Cléryat Jan 4, 2022
Easy
7 votes2320 runs0 comment
Medium
7 votes1529 runs3 comments
Easy
6 votes3880 runs0 comment