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pulsation/hash_accu.scala

Last active December 22, 2015 20:08
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Accumulate hash values using Scala
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hash_accu.scala
val myHashList = List("at work" -> 7, "at home" -> 5, "at david's" -> 3)
val myNewValue = "at home" -> 1
myHashList :+ myNewValue groupBy (_._1) map {case (k, v) => (k, v.map(_._2).sum)} toList
// List(at home -> 6, at work -> 7, at david's -> 3)
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