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So do the implementations of functional programming languages.

• ZenoArrow 12y ago
  All the state-altering functions of Haskell are kept separate from the non-state-altering ones. That's what makes Haskell "pure functional" as opposed to "functional". The state-changing functions were designed after the non-state-changing ones, which is what we've been trying to tell you!
  • theoh 12y ago
    Good grief. I said the _implementation_, not the language. They all use mutable state. Go read a paper. http://research.microsoft.com/apps/pubs/default.aspx?id=67083 http://research.microsoft.com/apps/pubs/default.aspx?id=6708...