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JavaScript's functional programming helper library.

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// Generate an integer Array containing an arithmetic progression. A port of
// the native Python `range()` function. See
// [the Python documentation](https://docs.python.org/library/functions.html#range).
export default function range(start, stop, step) {
  if (stop == null) {
    stop = start || 0;
    start = 0;
  }
  if (!step) {
    step = stop < start ? -1 : 1;
  }

  var length = Math.max(Math.ceil((stop - start) / step), 0);
  var range = Array(length);

  for (var idx = 0; idx < length; idx++, start += step) {
    range[idx] = start;
  }

  return range;
}