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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.

31.
Hard 
What is the output?

console.log([] == false);
32.
Easy 
Which method adds element to end of array?
33.
Medium 
Which function binds `this` permanently?
34.
Medium 
Which feature allows unpacking values?
35.
Easy 
Which value is falsy?
36.
Medium 
What is the output?

console.log('5' - 2);
37.
Easy 
Which method converts object to JSON string?
38.
Medium 
Which operator checks property existence?
39.
Hard 
Which method executes microtasks?
40.
Medium 
Which keyword accesses parent class?
41.
Easy 
What is the output?

console.log(typeof undefined);
42.
Medium 
Which API stores key-value data in browser?
43.
Medium 
Which method stops event bubbling?
44.
Easy 
Which loop runs at least once?
45.
Easy 
Which keyword throws exception?
Answered: 0 / 15

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