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Asked: 2026-06-02T01:56:56+00:00

I am trying to get a mutable.HashMap[Int, ArrayBuffer[Int]] into a immutable.HashMap[Int, Vector] for part

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I am trying to get a mutable.HashMap[Int, ArrayBuffer[Int]] into a immutable.HashMap[Int, Vector] for part of my class constructor. The result immutable.HashMap should be assigned to a val as well. What I am doing is reading an edgelist file into a graph format, and once that is done I want to guarentee the graph to be immutable, hence the immutable.HashMap.

The constructor should take a filename: String, read in the edgelist to some mutable form, and then at the end have a member of the class val adjList be the resulting immutable adjacency list form.

Thanks!

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1 Answer

  1. Editorial Team
    xs.mapValues(v => Vector() ++ v).toMap

    will do the trick (where xs is your mutable HashMap, of course).

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