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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
28 votes3674 runs
2 comments
Easy
11 votes4129 runs
5 comments
Easy
11 votes3936 runs
3 comments
Easy
11 votes3913 runs2 comments
Easy
10 votes4156 runs0 comment
Hard
10 votes2296 runs3 comments
Medium
9 votes3996 runs
5 comments
Easy
8 votes3993 runs
2 comments
Easy
8 votes2870 runs
1 comment
Hard
8 votes2334 runs
2 comments
Medium
7 votes2697 runs
1 comment
Hard
7 votes2408 runs0 comment

What will this code display?

Front-end developer
javascript
function
identity
Jean-marie Cléryat Jan 4, 2022
Hard
7 votes2355 runs
1 comment

Invert a string in Javascript

Front-end developer
arrays
strings
Jean-marie Cléryat Jan 4, 2022
Easy
7 votes2323 runs0 comment
Medium
7 votes1532 runs3 comments
Easy
6 votes3897 runs0 comment