A shorthand for Math.random() * scale: Instead of multiplying Math.random's result, you can pass your scale as the argument to Math.random Before: Math.random() * 4 Now: Math.random(4)

Math.random-with-scale.js

Math.random = (function (_random) {
  // _random is the reference to the original / native random
  return function (scale) {
    (scale && scale === +scale) || (scale = 1); // Make sure scale is set and a number !== 0
    return _random() * scale;
  }
})(Math.random);