Imported From: https://issues.scala-lang.org/browse/SI-1607?orig=1
Reporter: pascalg

Mohsen Lesani [X] (lesani) said:

scala>  Array(1,2,3).hashCode == Array(1,2,3).hashCode
res0: Boolean = false

scala> List(1,2,3).hashCode == List(1,2,3).hashCode
res1: Boolean = true

The same in Trunk.

@odersky said:
Arrays are not lists. In particular, arrays are mutable, which means completely different design criteria for hashcode and equals.

Simon Sotak (the21st) said (edited on Mar 31, 2016 2:51:29 PM UTC):
But the same thing works as expected for mutable scala collections, so shouldn't it work for (mutable) Arrays?

scala> mutable.Seq(1, 2).hashCode == mutable.Seq(1, 2).hashCode
res0: Boolean = true

@SethTisue said:
since Scala 2.8, Scala arrays are just Java arrays, so we aren't free to make the hashCode method return a different answer than Java does.

scala.collection.mutable.WrappedArray, on the other hand, behaves as you would like.