Supreme Javascript Test - 63+ MCQs: JavaScript test: Assess Your Knowledge with JavaScript Questions and Answers

1. How do you check if an element has a specific class in JavaScript?

element.hasClass()

element.isClass()

element.containsClass()

element.classList.contains()

2. Which method is used to remove the last element from an array in JavaScript?

removeLast()

pop()

deleteLast()

splice()

3. What is the result of the expression '2' + 2 in JavaScript?

'22'

'4'

An error

4. How do you declare a function in JavaScript?

function myFunction() { // code }

def myFunction():

create function myFunction():

new_function myFunction():

5. What is the purpose of 'setTimeout()' in JavaScript?

Executes a function after a specified time

Pauses the execution of a function

Adds a delay to CSS animations

Sets an interval for a function

6. What is the purpose of the 'reduce' method in JavaScript?

To create a new array with the results of calling a provided function on every element in the array

To filter elements in an array

To reduce the array to a single value

To reverse the elements of an array

7. How do you round the number 7.25 to the nearest integer in JavaScript?

Math.round(7.25)

Math.ceil(7.25)

Math.floor(7.25)

round(7.25)

8. What is the purpose of the 'fetch' function in JavaScript?

To retrieve data from a server

To delete data from a server

To update data on a server

To send an email

9. What is the result of the expression '2 + 2' in JavaScript?

undefined

10. What is the purpose of the 'async' keyword in JavaScript?

To define a synchronous function

To handle exceptions

To indicate that a function returns a promise

To create an asynchronous loop

JavaScript MCQ Test 5