/**
 * Creates an array of numbers (positive and/or negative) progressing from
 * `start` up to, but not including, `end`. A step of `-1` is used if a negative
 * `start` is specified without an `end` or `step`. If `end` is not specified,
 * it's set to `start` with `start` then set to `0`.
 */
export const range = (a: number, b?: number, step?: number) => {
  if (typeof b !== 'number') {
      b = a;
      a = 0;
  }

  if (typeof step !== 'number') {
      step = a < b ? 1 : -1;
  }

  const length = Math.max(Math.ceil((b - a) / (step || 1)), 0);
  const result = new Array(length);
  let x = a;

  for (let i = 0; i < length; i++) {
      result[i] = x;
      x += step;
  }

  return result;
}