You are not the fastest

[uncaught]

I'm beating you by almost double ;)

function arrayAndCombiner(a, b) {
  if (!a.length) {
    return a;
  }
  if (!b.length) {
    return b;
  }
  const bSet = new Set(b);
  return a.filter((i) => bSet.has(i));
}

[lovasoa]

🎉 congrats

[lovasoa]

:p