Determine Odd / Even Numbers using JavaScript

In this article, we are going to talk about numbers, odd and even numbers with some JavaScript.

Let's gets started,

• Choose a random number

let number = 24

• As we know this number is even, but let's check this with JavaScript

if(number % 2 === 0){
        console.log(`${number} is an even number`)
}else{
        console.log(`${number} is odd number`)
}

• This gives the following output,

// 24 is an even number

This is how you can determine odd / even numbers using JavaScript.

By the way, I have a tutorial on it so make sure to check that out

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Comments

[Jon Randy 🎖️]

If you care about performance, it's actually quicker to use a bitwise test:

const isOdd = i => i&1
const isEven = i => 1&i^1

[Sir.Nathan (Jonathan Stassen)]

I've never really understood bitwise operators.

[Sir.Nathan (Jonathan Stassen)]

Nifty! What other ways might you determine if a number is even or odd?
How might you use this to determine if a number is divisible by 5?

[Dhairya Shah]

To Determine number is divisible by 5, you can try

let number = 150

if(number % 5 === 0){
        console.log(`${number} is divisible by five`)
}else{
        console.log(`${number} is not divisible by 5`)
}
// Output: 150 is divisible by five

[Sir.Nathan (Jonathan Stassen)]

Nice! Makes sense!

[Andrew Baisden]

Works like a charm I use this code often when trying to separate odd from even.