JS Assignment Operator
JavaScript
In this tutorial we will learn about JavaScript assignment operators.
We use the assignment operator to assign value to a variable.
In JavaScript (and in other programming languages) the equal to sign = is the assignment operator and it assign the value on the right side to the variable on the left side.
In the following example we are assigning the value 10 to the variable x using the assignment operator.
var x = 10;
Shorthand notation
We can combine the assignment operator and arithmetic operator together to get a shorthand notation if we are operating on a given variable.
In the following example we are adding 10 to variable x and then assigning the result to the variable x.
var x = 10;
//adding 10
x = x + 10;
console.log(x); //this will print 20
We can get the same result by combining the operators together.
var x = 10;
//adding 10
x += 10;
console.log(x); //this will print 20
Following is the list of shorthand assignment operators used with arithmetic operators.
| Operator | Symbol | Example |
|---|---|---|
| Addition and assignment | += | x += 10 |
| Subtraction and assignment | -= | x -= 10 |
| Multiplication and assignment | *= | x *= 10 |
| Division and assignment | /= | x /= 10 |
| Modulus (to get remainder) and assignment | %= | x %= 10 |
Addition and assignment
In the following example we are assigning the result of addition to a variable.
var x = 10;
var y = 20;
//long
x = x + y
console.log(x); //this will print 30
Shorthand
var x = 10;
var y = 20;
//shorthand
x += y
console.log(x); //this will print 30
Subtraction and assignment
In the following example we are assigning the result of subtraction to a variable.
var x = 10;
var y = 20;
//long
x = x - y
console.log(x); //this will print -10
Shorthand
var x = 10;
var y = 20;
//shorthand
x -= y
console.log(x); //this will print -10
Division and assignment
In the following example we are assigning the result of division to a variable.
var x = 4;
var y = 2;
//long
x = x / y
console.log(x); //this will print 2
Shorthand
var x = 4;
var y = 2;
//shorthand
x /= y
console.log(x); //this will print 2
Multiplication and assignment
In the following example we are assigning the result of multiplication to a variable.
var x = 4;
var y = 2;
//long
x = x * y
console.log(x); //this will print 8
Shorthand
var x = 4;
var y = 2;
//shorthand
x *= y
console.log(x); //this will print 8
Modulus and assignment
In the following example we are assigning the result of modulus to a variable.
var x = 5;
var y = 2;
//long
x = x % y
console.log(x); //this will print 1
Shorthand
var x = 5;
var y = 2;
//shorthand
x %= y
console.log(x); //this will print 1
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