JavaScript MCQs

30 MCQs — Web Development MCQs (Page 1 of 3)

Practice JavaScript MCQs with correct answers and explanations. These questions are from the Web Development MCQs section.

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Accessibility & Standards	CSS
HTML	JavaScript
Server-Side & Architecture	Web Security

In JavaScript, what do null == undefined and null === undefined evaluate to?

true and true
false and true
true and false
false and false

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What does [10, 1, 2].sort() return in JavaScript?

[10, 2, 1]
[1, 10, 2]
[1, 2, 10]
TypeError

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What does this log? console.log(x); var x = 5;

5
null
undefined
ReferenceError

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What does this log? for (var i = 0; i < 3; i++) setTimeout(() => console.log(i), 0);

undefined three times
3 3 3
0 1 2
0 0 0

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In what order does this code log? console.log('A'); setTimeout(() => console.log('B'), 0); Promise.resolve().then(() => console.log('C')); console.log('D');

A D C B
A D B C
A B C D
A C D B

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With const obj = {a: 1};, what happens with obj.a = 2;?

TypeError
It works; const prevents reassigning the variable, not mutating the object
SyntaxError
obj becomes undefined

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What does parseInt(0.0000005) return?

NaN
0.0000005
5
0

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What does [] + {} evaluate to in JavaScript?

"[object Object]"
{}
TypeError
0

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With let arr = [1, 2, 3]; arr[10] = 5;, what is arr.length?

11
10
4
3

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What does Math.max() (called with no arguments) return?

0
undefined
Infinity
-Infinity

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