Check if a number is odd

JavaScript

const isOdd = (n) => n % 2 !== 0

// Or
const isOdd = (n) => !!(n & 1)

// Or
const isOdd = (n) => !Number.isInteger(n / 2)

TypeScript

const isOdd = (n: number): boolean => n % 2 !== 0

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

// Or
const isOdd = (n: number): boolean => !Number.isInteger(n / 2)

Examples

isOdd(1) // true
isOdd(2) // false