gistfile1.js

/**
 * Create a range string which can be evaluated to a native array.
 *
 * @param  {int} start
 * @param  {int} end
 * @return {string}
 * @api public
 */

function range(start, end) {
  s = parseInt(start), e = parseInt(end), b = '[' + s
  if (e > s) while (++s <= e) b += ',' + s
  else       while (--s >= e) b += ',' + s
  return b + ']'
}