How to Use the Assignment Operator in JavaScript

In this article, you will learn how to use the assignment operator in JavaScript.

What is the assignment operator?

The “=” (equal) symbol used when assigning a value to a variable is called an assignment operator.

For example, use it as follows.

var variable = value;

There are several types of assignment operators other than “=”.

Operator	Usage	Same As	Description
=	x = y	x = y	Assign a value to a variable
+=	x += y	x = x + y	Add a value to a variable
-=	x -= y	x = x – y	Subtract a value from a variable
*=	x *= y	x = x * y	Multiplie a variable
/=	x /= y	x = x / y	Divide a variable
%=	x %= y	x = x % y	Assign a remainder to a variable

Examples

The assignment operator can be used in various ways, but this time I will introduce four examples.

1.Initialization when defining variables

let count = 0;
let array = [];

2.Store another value in a predefined variable

count = 1;

3.Use the additive assignment operator as an abbreviation for numerical calculations

let count = 0;
if(）{
 count += 2;
}

4.Assign values ​​to HTML parts

document.getElementById("id").value = "Hello World";