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

1. How do you handle errors in asynchronous JavaScript code?

Using try...catch

Using if...else

Using switch statement

Using for loop

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

pop()

push()

shift()

unshift()

3. Which operator is used for strict equality in JavaScript?

===

!==

4. How do you define a JavaScript class?

class MyClass {}

function MyClass() {}

var MyClass = {};

new Class('MyClass')

5. 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)

6. What does HTML stand for?

Hyper Text Markup Language

Hyperlinks and Text Markup Language

Home Tool Markup Language

Hyper Transfer Markup Language

7. Which method is used to add a class to an HTML element in JavaScript?

element.addClass()

element.classList.add()

element.addClassList()

element.addStyle()

8. What is the purpose of 'Array.prototype.reduce()' in JavaScript?

Reduces an array to a single value

Reverses the elements of an array

Creates a new array with elements passing a test

Sorts the elements of an array

9. Which of the following is a benefit of using JavaScript modules?

Encapsulation

Code Reusability

Dependency Management

All of the above

10. What is the purpose of 'Promise' in JavaScript?

Handles asynchronous operations

Performs mathematical calculations

Creates an array of elements

Defines a function

JavaScript MCQ Test 5