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September 24, 2015 18:18
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Credit card number validation
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| def ccn_valid?(number) | |
| (number.to_s.split(//).inject([]){ |r,d| r << (r.count.even? ? (d.to_i * 2).to_s : d); r }.map{|d| d.split(//)}.flatten.inject(0){|sum,d| sum += d.to_i} % 10) == 0 | |
| end | |
| puts ccn_valid?("4417123456789113") |
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