Check if the creadit card is vaild with Ruby

checkValidCreditCard.rb

#!/usr/bin/env ruby
# frozen_string_literal: true

require 'creditcard'

# Usage: checkValidCreditCard.rb [card_number_0] [card_number_1] [card_number_???] 

puts "Usage: checkValidCreditCard.rb [card_number_0] [card_number_1] [card_number_???]" if ARGV.empty?
index = 0
while (card_number = ARGV.shift)
    if card_number.creditcard?
        puts "---------------------------"
        puts "Card #{index}: #{card_number}"
        puts '=> Valid: True'
        puts "=> Type: #{card_number.creditcard_type}"
        puts "---------------------------"
    else
        puts "---------------------------"
        puts "Card #{index}: ${card_number}"
        puts '=> Valid: True'
        puts '=> Valid: False'
        puts "---------------------------"
    end
    index += 1
end