function groupByLength(words: string[]): Record<number, string[]> {
  const newObj: Record<number, string[]> = {}

  words.forEach((word) => {
    if (!newObj[word.length]) newObj[word.length] = []
    newObj[word.length].push(word)
  })

  return newObj;
}

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