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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
25 votes3621 runs
2 comments
Easy
11 votes4085 runs
5 comments
Easy
11 votes3894 runs
3 comments
Easy
10 votes4111 runs0 comment
Easy
10 votes3870 runs2 comments
Hard
10 votes2280 runs3 comments
Medium
9 votes3950 runs
5 comments
Hard
8 votes2316 runs
2 comments
Easy
7 votes3946 runs
2 comments
Easy
7 votes2827 runs
1 comment
Hard
7 votes2388 runs0 comment

What will this code display?

Front-end developer
javascript
function
identity
Jean-marie Cléryat Jan 4, 2022
Hard
7 votes2336 runs
1 comment

Invert a string in Javascript

Front-end developer
arrays
strings
Jean-marie Cléryat Jan 4, 2022
Easy
7 votes2309 runs0 comment
Medium
7 votes1518 runs3 comments
Easy
6 votes3853 runs0 comment
Medium
6 votes2662 runs
1 comment