Data Type:- A data type is a classification of data , programming languages support various types of data like integer , character,string and boolean. When we define data type of attributes then compiler or interpreter came to know how the programmer wants to use the data.
JavaScript Data Type:- JavaScript is a dynamic type language we need not to specify type of the variable because it is dynamically used by JavaScript engine. We just need to use var keyword to specify the data type of variable and it can hold any type of values.
var a = 100; // integer value var b = "hello World"; // string value
In JavaScript data types classify into two types.
1. Primitive Data Type
2. Non-Primitive Data Type
1. Primitive Data Type:- There are five types of primitive data types in JavaScript. They are as follows:
| Data Type | Description |
| Number | Represent numeric value 1, 50 , 10000 etc |
| String | Represent sequence of characters “hello” , “morning” |
| Boolean | Represent either true or false |
| Null | Represent null value |
| Undefined | Represent undefined value(unknown) |
2. Non-Primitive Data Type:- There are three type of non-primitive data type. they are as following:
| Data Type | Description |
| Array | Represent group of similar value |
| Object | This is instance of class through which we can call member functions and variables |
| RegExp | Represent regular expression |