Primitive data types in Javascript

There are five types of primitive data types.

1. String
2. Number
3. Boolean
4. Undefined
5. Null

String

The string data type in JavaScript can be any group of characters enclosed by a single or double-quotes or by backticks.
let name = "Awais Butt"; // Using double quotes
let info = 'data'; // Using single quotes

Numbers

JavaScript has only one type of numbers. Numbers can be written with, or without decimals.
let number = 250; // integer value

Boolean

The boolean data type has only two values, true and false. It is mostly used to check a logical condition. Thus Booleans are logical data types which can be used for comparison of two variables or to check a condition.
let num1 = 5;
let num2 = 5;
(num1 == num2) // Returns true

Undefined

In JavaScript, a variable without a value, has the value undefined. The type is also undefined.

let name; //name is undefined and its type also undefined

Null

The null in JavaScript is a data type that is represented by only one value, the ‘null’ itself. A null value means no value.

let n = null;
console.log(n); // This returns null
If we check the data type of a using the typeof operator, we get:
typeof(n); // This returns object
This means the type of a null value is an object, not null.