function groupByRange(numbers: number[], rangeSize: number): Record<string, number[]> {
  var kr = {}
  numbers.map(e=>{
    let init_range = parseInt(e/rangeSize)
    let key = `${init_range*rangeSize}-${(init_range+1)*rangeSize}`
    if(!(key in kr))
      kr[key] = []
    kr[key].push(e)
    kr[key] = kr[key]
  })
  return kr
}

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