let f = {};
f.zip = (...xs) => {
  let r = [];
  let length = Math.min.apply(null, xs.map(x => x.length));
    xs.forEach(
      x => nple.push(x[i])
    );
    r.push(nple);
  }
  return r;
};
f.zipWith = (op, ...xs) =>
  f.zip.apply(null, xs).map(
    (x) => x.reduce(op)