If you are going to attend a JavaScript interview, then it is must for you to get a complete knowledge of JavaScript and what type of question will be asked commonly in the JavaScript interview. In this blog, I have come up with the most frequently asked JavaScript interview questions and answers. Refer to these questions and answers to crack an interview in the very first
attempt.

Basic JavaScript Interview Questions

Q1) What is JavaScript?

Ans. JavaScript is a scripting language used for programming web pages as well as server systems. It is an object-oriented, interpreted, lightweight and powerful programming language, made up of first-class functions. The JavaScript can update the content dynamically for web pages.

Q2) What are the differences between JavaScript and Java?

Ans. Java is an object-oriented and structured programming language, which help to run web pages on different platforms. The java code should be compiled on the compiler. JavaScript is an object-oriented scripting language. In which, the scripts are optimized for both server and client side. Javascript is introduced to perform HTML pages.

Q3) Name the different types of JavaScript data?

Ans. JavaScript data are of the following types -

String

Function

Boolean

Object

Number
Null

Q4) What is the definition of global variables? In what way, these variables are declared?

Ans. A global variable is a special kind of variable in JavaScript. This variable is easy to use and also available across the entire length of the JavaScript code. Mainly, the var keyword is used whether to declare a global or local variable.

Q5) What is the definition of the prompt box?

Ans. The Input provided by any user in the JavaScript is entered with the help of a prompt box. While putting forward the data or the input, the prompt box allows the user to do this with the help of a text box. To include the number, label box is also used.

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