barcode.rb

# Const
CODE_NUMS = 100
CODE_LENGTH = 8
AVAILABLE_CHARS = ('A'..'Z').to_a.delete_if{|c| c == 'O'}
AVAILABLE_CHARS_NUM = AVAILABLE_CHARS.length

# Throw random nums to suck
code_suck = []
(CODE_NUMS*2).times do
	buff = []
	(CODE_LENGTH-1).times {buff << rand(AVAILABLE_CHARS_NUM)}
	code_suck << buff
end

# Jangle, jangle
code_suck = code_suck
	.map {|c| c << (c.inject(&:^) % AVAILABLE_CHARS_NUM) }
	.map {|c| c.map{|n| AVAILABLE_CHARS[n] }.join }
	.uniq
	.shuffle
	.take(CODE_NUMS)

puts code_suck