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haiy/scala map merge

Created January 7, 2015 10:17
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scala map merge
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scala map merge
def merge(m1: Map[String, Int], m2: Map[String, Int]): Map[String, Int] =
m1 ++ m2.map { case (k, v) => k -> (v + m1.getOrElse(k, 0)) }
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