Roy's AI LabWeb Development
JavaScript Interview Practice
Practise JavaScript with multiple-choice questions in the style used in technical screening. Every answer comes with an explanation.
Free sets
Pro sets
Sample questions
1. Which keyword declares a variable that cannot be reassigned?
- A. const
- B. var
- C. let
- D. static
2. What does typeof null return?
- A. "null"
- B. "object"
- C. "undefined"
- D. "boolean"
Answers and explanations appear after you submit the full free set.