function groupByLength(words: string[]): Record<number, string[]> {
  if (!words.length) return {}
  const map = new Map<string, string[]>();
  for(const word of words) {
    const wLength = word.length;
    const currVals = map.get(wLength.toString()) || []
    map.set(wLength.toString(), [...currVals, word])
  }
  // Escribe tu solución aquí
  return Object.fromEntries(map);
}

// No modificar: necesario para evaluar el resultado.
export { groupByLength };