Ruby: Applikasi toko simple

toko.rb

bill = 0
products = {}
products[:a] = {:nama => 'sampo', :harga => 25000}
products[:b] = {:nama => 'sikat gigi', :harga => 10000}
products[:c] = {:nama => 'air mineral', :harga => 3000}
products[:d] = {:nama => 'gelas', :harga => 4000}
products[:e] = {:nama => 'piring', :harga => 7000}

loop do
  products.each do |key, product|
    puts "#{key}. #{product[:nama]} = #{product[:harga]}"
  end

  print 'Silakan pilih product yang akan dibeli : '
  selected = gets.strip

  case selected
    when 'a'
      product = products[:a]
    when 'b'
      product = products[:b]
    when 'c'
      product = products[:c]
    when 'd'
      product = products[:d]
    when 'e'
      product = products[:e]
    else
      puts 'Produk yang anda pilih tidak tersedia!'
  end

  if product
    bill += product[:harga]
  end

  print 'Ingin berbelanja lagi? y/n : '
  again = gets.strip
 
  break if again == 'n'
end

puts "Total tagihan belanja anda Rp. #{bill}"