On: Arrays considered somewhat harmful

[iman]

I'd also like to add that arrays are the foundational building block of an extension of Haskell focused on parallelism, called "Data Parallel Haskell"

http://www.haskell.org/haskellwiki/GHC/Data_Parallel_Haskell

[thesz → iman]

And there they are immutable, as well as their values.