shit.rb

require 'pry'
def getIssuer(number)

    number_size = number.to_s.size
    number = number.to_s

    binding.pry

    if number_size == 15 && ([*34..37].include? number[0..1].to_i)
      "AMEX"
    elsif number_size == 16 && number[0..3] == '6011'
      "Discover"
    elsif number_size == 16 && ([*51..55].include? number[0..1].to_i)
      'Mastercard'
    elsif (number_size == 13 || number_size == 16) && number[0] == '4'
      'VISA'
    else
      'Unknown'
    end
end


getIssuer(4111111111111111)