JavaScript Interview Questions Quiz Part 1

Are you preparing for a JavaScript interview?

Test your skills with this quiz and see how well you know the fundamentals of JavaScript. These 10 questions are designed to challenge both beginners and intermediate developers, helping you identify areas where you might need more practice.

JavaScript Interview Questions Quiz Part 1

1 / 10

What is the correct syntax to create an array in JavaScript?

A) var arr = "1, 2, 3"

B) var arr = (1, 2, 3)

C) var arr = [1, 2, 3]

D) var arr = {1, 2, 3}

2 / 10

Which method can be used to serialize a JavaScript object into a JSON string?

A) JSON.parse()

B) JSON.stringify()

C) JSON.convert()

D) JSON.serialize()

3 / 10

What is the output of console.log(2 + '2');?

A) 4

B) 22

C) NaN

D) Error

4 / 10

What is the correct way to declare a constant in JavaScript?

A) constant x = 10;

B) var x = 10;

C) let x = 10;

D) const x = 10;

5 / 10

Which of the following is not a loop in JavaScript?

A) for

B) while

C) foreach

D) do-while

6 / 10

What does the bind() method do in JavaScript?

A) Creates a new function, bound to a specific this context

B) Joins two arrays together

C) Calls a function immediately

D) Binds two objects together

7 / 10

Which of the following methods adds one or more elements to the end of an array?

A) push()

B) pop()

C) shift()

D) unshift()

8 / 10

What will typeof NaN return?

A) Number

B) Undefined

C) NaN

D) String

9 / 10

How do you write a comment in JavaScript?

A) // This is a comment

B) <!-- This is a comment -->

C) # This is a comment

D) /* This is a comment */

10 / 10

Which of the following is NOT a JavaScript data type?

A) Undefined

B) Number

C) Float

D) Boolean

Your score is

The average score is 74%

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