JavaScript Interview Questions and Answers

Question 1

What are client side and server side?

Accepted Answer

A client is a device, application, or software component that requests and consumes services or resources from a server.

Question 2

What is DOM? What is the difference between HTML and DOM?

Accepted Answer

The DOM (Document Object Model) represents the web page as a tree-like structure that allows JavaScript to dynamically access and manipulate the content and structure of a web page.

Question 3

What are selectors in JS?

Accepted Answer

Selectors in JS help to get specific elements from DOM based on IDs, class names, tag names.

Question 4

What is the difference between getElementById, getElementsByClassName and getElementsByTagName?

Accepted Answer

`getElementById()` selects a single element by its ID. `getElementsByClassName()` selects multiple elements that share the same class name. `getElementsByTagName()` selects multiple elements based on their tag name.

Question 5

What are data types in JS?

Accepted Answer

A data type determines the type of variable.

JavaScript Interview Questions and Answers

Chapter 1: Basics