One line(囧rz) to test isbn13 in ruby
a="9780007103072"
(10-(a.split '').map{|i| i.to_i}[0,12].map.with_index{|n,i| n*(i%2*2+1)}.reduce(:+)%10)%10 == a[12].to_iWritten by Tiao Lims
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