CHAPTER - 6



All programming languages in the world have data types. So, JavaScript is not an exception. Javascript also has pre-defined or built-in data types as well as user-defined data types.

But JavaScript is a loosely typed language. That means one does not need to mention data types specifically. In the case of Java, C++ and C, one has to define data type specifically and only that kind of data can be stored in that variable.

Statically Typed language

Must define the data type of the variable before using it.


C, C++ Java, Typescript

Int a=10;

a=’Rajesh’ // Error

String name = 10;

Dynamic Typed Language

In Javascript

var a =10 // fine

a =”Rajesh” // fine

There are the following types of data types in Javascript

Boolean: true/false

Null: null

Undefined: undefined

Number: 10,20 etc

String: “Hello”

Object: obj={}Symbol: Symbol

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