Entry tags:

scala wtf

scala> val m = Map("a"->1, "b"->2, "c"->2)
m: scala.collection.immutable.Map[String,Int] = Map(a -> 1, b -> 2, c -> 2)

scala> val m1=m map {case (x,y) => (y,x)}
m1: scala.collection.immutable.Map[Int,String] = Map(1 -> a, 2 -> c)

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