notNotion - Daily Quiz To Test JavaScript Knowledge

JavaScript-Basics

Quiz To Test Your Basic JavaScript Knowledge

1. What is the correct way to declare a variable in JavaScript?

variable x;

var x;

x = variable;

let x;

2. Which of the following is a valid way to comment out a single line in JavaScript?

// This is a comment

/* This is a comment */

# This is a comment

** This is a comment **

3.What does the typeof operator do in JavaScript?

Checks if a variable is undefined

Returns the data type of a variable

Converts a value to a string

Checks if a variable is null

4.What is the correct syntax for an if statement in JavaScript?

if (condition) { // code to execute }

if (condition) // code to execute

if (condition) { code to execute }

if condition { // code to execute }

5. Which of the following methods is used to add a new element to the end of an array in JavaScript?

append()

push()

add()

concat()