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

  words.forEach(word => {
    const size = word.length

    if(!result[size]) {
      result[size] = []
    }

    result[size].push(word)
  })

  return result;
}

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