JavaScript Basics Quiz

Variables, types, arrays, and async fundamentals. Ideal for students and interview prep.

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QUESTION NO 01

JavaScript is primarily used for?

Answer: Making web pages interactive

JS adds behavior and interactivity in browsers (and servers via Node).

Shahzad Mahota @shahzad-mahota

302 Quizzes

2930 Questions

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QUESTION NO 02

Which keyword declares a block-scoped variable?

Answer: let

let (and const) are block-scoped; var is function-scoped.

Shahzad Mahota @shahzad-mahota

302 Quizzes

2930 Questions

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QUESTION NO 03

=== compares?

Answer: Value and type

Strict equality checks type and value without coercion.

Shahzad Mahota @shahzad-mahota

302 Quizzes

2930 Questions

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QUESTION NO 04

typeof null returns?

Answer: "object"

A long-standing JS quirk: typeof null === "object".

Shahzad Mahota @shahzad-mahota

302 Quizzes

2930 Questions

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QUESTION NO 05

Array method that creates a new array by transforming each item?

Answer: map

map returns a new array of mapped values.

Shahzad Mahota @shahzad-mahota

302 Quizzes

2930 Questions

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QUESTION NO 06

JSON stands for?

Answer: JavaScript Object Notation

JSON is a text format based on JS object syntax for data interchange.

Shahzad Mahota @shahzad-mahota

302 Quizzes

2930 Questions

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QUESTION NO 07

A Promise represents?

Answer: A future completion/failure of an async operation

Promises handle asynchronous success (resolve) or failure (reject).

Shahzad Mahota @shahzad-mahota

302 Quizzes

2930 Questions

00 Likes

QUESTION NO 08

addEventListener is used to?

Answer: Attach event handlers to elements

It registers callbacks for events like click, submit, keydown.

Shahzad Mahota @shahzad-mahota

302 Quizzes

2930 Questions

00 Likes

QUESTION NO 09

const prevents?

Answer: Reassignment of the binding

const forbids reassigning the variable; object contents may still change.

Shahzad Mahota @shahzad-mahota

302 Quizzes

2930 Questions

00 Likes

QUESTION NO 10

NaN stands for?

Answer: Not a Number

NaN is the result of invalid numeric operations; typeof NaN is "number".

Shahzad Mahota @shahzad-mahota

302 Quizzes

2930 Questions

00 Likes

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Shahzad Mahota

@shahzad-mahota

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JavaScript Basics Quiz

JavaScript is primarily used for?

Which keyword declares a block-scoped variable?

=== compares?

typeof null returns?

Array method that creates a new array by transforming each item?

JSON stands for?

A Promise represents?

addEventListener is used to?

const prevents?

NaN stands for?

Published By

Shahzad Mahota

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00

00

00

00

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JavaScript Basics Quiz

JavaScript is primarily used for?

Explanation

Which keyword declares a block-scoped variable?

Explanation

=== compares?

Explanation

typeof null returns?

Explanation

Array method that creates a new array by transforming each item?

Explanation

JSON stands for?

Explanation

A Promise represents?

Explanation

addEventListener is used to?

Explanation

const prevents?

Explanation

NaN stands for?

Explanation

Published By

Shahzad Mahota

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00

00

00

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