Module 1: Project 1: Credit Check

credit_check.rb

account_number = []
 while account_number.length < 15
  puts "Enter an account number to validate."
  account_number = gets.chomp
    end

single_digits = []
  account_number.each_char {|number| single_digits << number.to_i} 
    #iterates through account_number and converts digits to integers and adds them to single_digits

doubled_digits = []                                
  if account_number.length.even? then doubled_digits = single_digits.each_with_index.map { |number, index| if index.even? then number * 2 else number end}
    else doubled_digits = single_digits.each_with_index.map { |number, index| if index.odd? then number * 2 else number end}
      end  
        # multiplies alternating digits by 2

split_numbers = []
  split_numbers = doubled_digits.map {|number| if number >= 10 then number.to_s.split('') else number end}
    #converts numbers greater than 9 to strings and splits digits

combined_numbers = []
a = nil
b = nil
combined_numbers = split_numbers.each_with_index.map {|number, index| if split_numbers[index].class == Array then 
      a = number.first.to_i ; b = number.last.to_i ; split_numbers[index] = (a+b) else  number end}
      #digging into nested arrays and combining values
total = 0
combined_numbers.each {|number| total += number}
    #calculating total of array elements

if total % 10 == 0
  puts "The number is valid"
else
  puts "The number is invalid"
    #final calculation and output
  end