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smerrill/gist:571149

Created September 9, 2010 00:47
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gistfile1.scala
def verify(a:String) = {(10 - a.reverse.tail.zip(Stream.continually(List(2, 1)).flatten).foldLeft(0)((sum, vals) => sum + (vals._1.toString.toInt * vals._2).toString.toList.foldLeft(0)(_+_.toString.toInt)) % 10).toString.last.toString.toInt == a.last.toString.toInt}
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