function groupByRange(numbers: number[], rangeSize: number): Record<string, number[]> {

  const groupedNumbers = {}
  let max = rangeSize

  numbers.forEach((n)=>{
    while(max<=n) max+=rangeSize
    const prevNumbers = groupedNumbers[`${max-rangeSize}-${max}`] || []
    groupedNumbers[`${max-rangeSize}-${max}`] = [...prevNumbers, n]
    max = rangeSize;
  })

  return groupedNumbers;
}

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