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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 votes3559 runs
2 comments
Easy
11 votes4031 runs
5 comments
Easy
11 votes3844 runs
3 comments
Easy
10 votes4054 runs0 comment
Easy
10 votes3819 runs2 comments
Hard
10 votes2264 runs3 comments
Medium
9 votes3892 runs
5 comments
Hard
8 votes2298 runs
2 comments
Easy
7 votes3892 runs
2 comments
Easy
7 votes2773 runs
1 comment
Hard
7 votes2372 runs0 comment

What will this code display?

Front-end developer
javascript
function
identity
Jean-marie Cléryat Jan 4, 2022
Hard
7 votes2321 runs
1 comment

Invert a string in Javascript

Front-end developer
arrays
strings
Jean-marie Cléryat Jan 4, 2022
Easy
7 votes2293 runs0 comment
Medium
7 votes1493 runs3 comments
Medium
6 votes2627 runs
1 comment