Check if a number is even

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