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JavaScript Objective Questions and Answers

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This JavaScript MCQ quiz contains carefully curated objective and code-based questions with correct answers and clear explanations. Ideal for beginners, experienced developers, and interview preparation, covering core JavaScript, ES6+, asynchronous programming, and DOM manipulation.

Practice JavaScript MCQs with Detailed Explanations

Answer at least 12 questions to submit.

46.
Easy 
What is the output?

console.log(typeof []);
47.
Medium 
Which function executes immediately?
48.
Easy 
Which keyword defines strict mode?
49.
Medium 
Which loop works with iterables?
50.
Easy 
Which keyword refers to current object?
51.
Medium 
What is the output?

console.log(1 + '2' + 3);
52.
Easy 
Which method removes last array element?
53.
Medium 
Which operator assigns default values?
54.
Easy 
Which global object exists in browser?
55.
Easy 
Which method converts array to string?
56.
Medium 
Which syntax waits for promise result?
57.
Medium 
Which feature avoids callback hell?
58.
Medium 
Which method clones objects?
59.
Easy 
Which block handles errors?
60.
Medium 
Which scope is default in JavaScript?
Answered: 0 / 15

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