JS Arithmetic Operators

JavaScript

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In this tutorial we will learn about JavaScript arithmetic operators.

In JavaScript like other programming language we use different arithmetic operators to do maths.

Following is the list of arithmetic operators.

Operator Symbol Example
Addition + 1 + 2
Answer: 3
Subtraction - 1 - 2
Answer: -1
Multiplication * 4 * 5
Answer: 20
Division / 10 / 2
Answer: 5
Modulus (to get remainder) % 5 % 2
Answer: 1 (remainder)

Addition

In the following example we are adding the value of two variables.

var x = 10;
var y = 20;

var sum = x + y;

console.log(sum);	//this will print 30

Subtraction

In the following example we are subtraction the value of two variables.

var x = 10;
var y = 20;

var diff = x - y;

console.log(diff);	//this will print -10

Division

In the following example we are dividing the value of two variables.

var x = 4;
var y = 2;

var di = x / y;

console.log(di);	//this will print 2

Multiplication

In the following example we are multiplying the value of two variables.

var x = 4;
var y = 2;

var mul = x * y;

console.log(mul);	//this will print 8

Modulus

In the following example we are finding the reaminder by using mudulus operator.

var x = 4;
var y = 2;

var mod = x % y;

console.log(mod);	//this will print 0 as there is no remainder

In JavaScript and in other programming languages incrementing and decrementing value of a variable by 1 is very common.

Increment by 1

In the following example we are incrementing the value of variable x by 1.

var x = 10;
x = x + 1;

console.log(x);	//this will print 11

Decrement by 1

In the following example we are decrementing the value of variable x by 1.

var x = 10;
x = x - 1;

console.log(x);	//this will print 9

Another way to accomplish this task is by using the increment and decrement operator.

Increment operator ++

In the following example we are incrementing the value of variable x by 1.

var x = 10;
x++;

console.log(x);	//this will print 11

Decrement operator --

In the following example we are decrementing the value of variable x by 1.

var x = 10;
x--;

console.log(x);	//this will print 9