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tyano/gist:1429218

Created December 4, 2011 04:54
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List(1, 2, 3, 1) を Map(1 -> 2, 2 -> 1, 3 -> 1) No.2
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gistfile1.scala
List(1,2,3,1).foldLeft(Map[Int,Int]()) { (x, y) => x.get(y) match { case Some(v) => x + Pair(y, (v + 1)) case None => x + Pair(y, 1) }}
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