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muraiki/gist:492539f842085f980349

Created March 16, 2015 22:57
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groupBy
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gistfile1.scala
def groupBy[A](xs: List[A]): Map[A, Int] =
xs.foldLeft(Map[A, Int]()) { (m: Map[A, Int], x: A) => m + (x -> (m.get(x).getOrElse(0) + 1)) }
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