create arithmetic sequence

Array.range.js

Array.range = function () {
  let realMin, realMax, step, arr = [];
  if (arguments.length >= 3) {
    realMin = arguments[0]; realMax = arguments[1]; step = arguments[2];
  } else if (arguments.length === 2) {
    realMin = arguments[0]; realMax = arguments[1]; step = 1;
  } else if (arguments.length === 1) {
    realMin = 0; realMax = arguments[0]; step = 1;
  } else return arr;
  const total = Math.floor((realMax - realMin) / step);
  for (let i = 0; i < total; i++) {
    arr[i] = realMin + i * step;
  }
  return arr;
}