a quick, simple but not very efficient answer to: https://twitter.com/peterbe/status/446139741902086145

gistfile1.txt

function pySplit(str, sep, num) {
  var pieces = str.split(sep)
  if (arguments.length < 3) {
    return pieces;
  }
  if (pieces.length < num) {
    return pieces;
  }
  return pieces.slice(0, num).concat(pieces.slice(num).join(sep));
}