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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
23 votes3420 runs
2 comments
Easy
10 votes3901 runs
5 comments
Easy
10 votes3721 runs
3 comments
Easy
9 votes3693 runs2 comments
Hard
9 votes2223 runs3 comments
Easy
8 votes3925 runs0 comment
Medium
8 votes3753 runs
5 comments
Hard
8 votes2260 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 votes2262 runs0 comment
Medium
7 votes1469 runs3 comments
Easy
6 votes3766 runs
2 comments
Medium
6 votes2550 runs
1 comment
Hard
6 votes2335 runs0 comment

What will this code display?

Front-end developer
javascript
function
identity
Jean-marie Cléryat Jan 4, 2022
Easy
5 votes2643 runs
1 comment