A Guide to Scala Collections: Exploring Monads in Scala Collections | by Robert DeCaire | RedElastic
GitHub - scala/scala-parallel-collections: Parallel collections standard library module for Scala 2.13+
GitHub - scala/scala-collection-compat: makes some Scala 2.13 APIs (primarily collections, also some others) available on 2.11 and 2.12, to aid cross-building
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