JavaScript coding interview practice
40 test-checked JavaScript exercises for the live-coding interview: strings, arrays, objects, closures and async. A worked example, then its twin to solve. Free.
Topics
- Strings: 6 exercises
- Arrays: 10 exercises
- Objects: 7 exercises
- Functions: 4 exercises
- Async: 4 exercises
- Practical: 9 exercises
Each exercise pairs a worked example with a twin problem to solve in a real editor; the tests run the moment you do. Interview mode hides the example: solve it from memory, without the hint or the solution, and it counts as solved cold. Progress is saved in your browser, and in your account if you sign in.