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JavaScript Quiz
Answer the 12 questions below — you get instant feedback on each. Your best score is saved on this device.
1Which keyword declares a variable that cannot be reassigned?
2Which operator strictly compares value AND type?
3How do you write a comment in JavaScript?
4Which method adds an item to the end of an array?
5What does console.log() do?
6Which characters create a template literal?
7What does Array.isArray([1,2]) return?
8Which loop runs while a condition is true?
9What is typeof "hello"?
10Which symbol defines an arrow function?
11Which method joins array elements into a string?
12What does NaN stand for?