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vinniefranco/gist:1956353

Created March 2, 2012 06:59
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gistfile1.rb
# Tiny ass Luhn CC Check
def valid_luhn_cc? cc
a = i = 0
cc.each_char { |c| ((i%2)==0)? a+=c.to_i : (c.to_i*2).divmod(10).each { |j| a+=j }; i+=1 }
a % 10 == 0
end
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