Last Updated : 23 Jul, 2025
The remainder operator in JavaScript is used to get the remaining value when an operand is divided by another operand. In some languages, % is considered modulo. Modulo and Remainder work differently when the sign of both operands is different.
In JavaScript remainder takes the sign of the dividend and to get modulo ((a % n) + n) % n should be used instead of a % n.
Syntax
remainder = var1 % var2
Example 1: This example returns the positive remainder in this case both modulo and remainder will be the same as both operands are positive.
JavaScript
<script>
// Initializing variables
var a =4
var n = 2
// Calculating remainder
var rem = a%n
// Calculating modulo
var mod = ((a%n)+n)%n
// Printing result
console.log("Remainder is "+rem)
console.log("Modulo is "+mod)
</script>
Output:
"Remainder is 0" "Modulo is 0"
Example 2: This example returns a negative remainder as the dividend is negative.
JavaScript
<script>
// Initializing variables
var a =-4
var n = 2
// Calculating remainder
var rem = a%n
// Calculating modulo
var mod = ((a%n)+n)%n
// Printing result
console.log(rem)
console.log(mod)
</script>
Output:
-0 0
Example 3: Remainder with Infinity and NaN
JavaScript
<script>
// Both operands are NaN
console.log(NaN%NaN)
// Dividend is NaN
console.log(NaN%2)
// Dividend is Nan and Divisor is Infinity
console.log(NaN%Infinity)
// Dividend is Infinity and Divisor is NaN
console.log(Infinity%NaN)
// Both operands are Infinity
console.log(Infinity%Infinity)
// Dividend is infinity
console.log(Infinity%5)
</script>
Output:
NaN NaN NaN NaN NaN NaN
We have a complete list of Javascript Operators, to check those please go through the Javascript Operators Complete Reference article.
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