Why no immutable arrays in scala standard library?

Question

Scala has all sorts sorts of immutable sequences like List, Vector,etc. I have been surprised to find no implementation of immutable indexed sequence backed by a simple arra

Answer 1

Mostly because there are no arrays whatsoever in Scala. What you're seeing is java's arrays pimped with a few methods that help them fit into the collection API.

Anything else wouldn't be an array, with it's unique property of not suffering type erasure, or the broken variance. It would just be another type with indexes and values. Scala does have that, it's called IndexedSeq, and if you need to pass it as an array to some 3rd party API then you can just use .toArray