Multiple-choice questions
- Server-side (122 questions) and browser-side (19 questions) quizzes on OptiLeague.
- Browser-side quiz on W3Schools (25 questions).
- JS Is Weird (25 questions).
- JavaScript Quiz (10 questions).
- CodesCracker (several quizzes).
- JavaTpoint (several quizzes).
Exercises
- Easy syntax exercises on W3Schools (67 exercises).
- JavaScript basics on JSchallenger (101 exercises).
- JavaScript DOM on JSchallenger (19 exercises).
- Random JavaScript exercises on JSchallenger (80 exercises).
- LeetCode (1000+ problems).
- Exercism (142 exercises).
- Math-related problems on Project Euler (841 problems).
- Edabit (2500+ challenges).
- Codewars (6000+ exercises).