Not able to update collections

[kvvt]

I am working on the below piece of code.

var lst = scala.collection.mutable.MutableList[VertexId]()
graph.edges.groupBy[VertexId](f).foreach {
  edgesBySrc => {
      lst ++= func(edgesBySrc)
  }
}

println(lst.length)

Here, the final println() always says that the length of the list is 0. The
list is non-empty (correctly prints the length of the returned list inside
func()).

I am not sure if I am doing the append correctly. Can someone point out what
I am doing wrong?





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