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Check if a number is even

Written byPhuoc Nguyen

Category

Validator

Created

06 May, 2020

Last updated

13 Oct, 2021

Contributors

JavaScript version

isEven.js

const isEven = (n) => n % 2 === 0;

// Or
const isEven = (n) => (n & 1) === 0;

// Or
const isEven = (n) => !(n & 1);

// Or
const isEven = (n) => Number.isInteger(n / 2);

TypeScript version

isEven.ts

const isEven = (n: number): boolean => n % 2 === 0;

// Or
const isEven = (n: number): boolean => (n & 1) === 0;

// Or
const isEven = (n: number): boolean => !(n & 1);

// Or
const isEven = (n: number): boolean => Number.isInteger(n / 2);

Examples

examples.js

isEven(1); // false
isEven(2); // true

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Phước Nguyễn

Check if a number is even

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