Data-Types

JavaScript is a loosely typed scripting language and over a time Javascript variables can receive different data types. A data type in a language defines the type of data variable that can hold. Data type basically typed data that can be used and manipulated in a program.

The latest ES6 standard defines the following data type: out of which 6 data types are primitive

Numbers

It represents both integers and floating-point numbers. EX- 4,6,7,4.6,94.9

let num = 2;
let count = 93.2;

String

A string is a sequence of characters. In Js, string can be enclosed within the single and double quotes. EX-

let name = Anurag;
let teacher = Hitesh;

Boolean

It represents the logical entity and can have two values true or false.

let login = true;
let Count = false;

Null

this type has one value: Null We discuss null in the next article

Undefined

A variable that has not been assigned a value is undefined.

Symbol

Introduced in ES6. Unlike other primitive data type, it does not have any literal form. It is a built-in object whose constructor returns a symbol that is unique.

To check the data types-

let x = 3;
console.log(typeof x);

EX-

Let firstName = 'vikas';
let lastName = 'singh';
const email = 'vikas828@gmail.com';
let mobNum = 980989898;
let pass = ''328dhdhw8"
let login = true;

console.log(typeof firstName);
console.log(typeof lastName);
console.log(typeof email);
console.log(typeof login);

EX-

let x = 10;

Here, let = keyword and x = variable and 5 is a value here 5 is assign to x it it is hold 5 with help of = operator

Note You can store multiple data types in an array.

let arr1 = ['vik', 'sik', 'liv', 'singh'];