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elliot/Luhn.coffee

Created August 23, 2011 07:24
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Luhn Algorithm in CoffeeScript
Raw
Luhn.coffee
validateLuhn = (number) ->
odd = true
sum = _(number.split '').reduceRight (total, digit) ->
digit = parseInt(digit)
digit *= 2 if (odd = !odd)
digit -= 9 if digit > 9
total + digit
, 0
sum % 10 == 0
@dumorango
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Tks!

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