JavaScript modulo

modulo.js

/* 
 * As method on Number prototype 
 * (slower, see: https://jsperf.app/negative-modulo/2) 
 *
 * Code:
  Number.prototype.mod = function (n) {
    "use strict";
    return ((this % n) + n) % n;
  };
 *
 * Example:
 * 2 % 3 => 2.mod(3) = 2
*/

// Better use: mod(2, 3) = 2
const mod = (n, m) => {
  return ((n % m) + m) % m;
};