Hi, I feel embarrased when I post newbie questions after one year of decent Haskell programming. But it feels much better to ask than to suffer in ignorance.
My newbie question is: Could anyone explain why the second version of the following function is better. Is there a tutorial kind of paper(or related) that gives programmer-view of closures? In particular when they are created, what do they contain and where and how they should be avoided to make program faster. Thank you very much, Saswat > You can see what is going on if you give the flag -ddump-simpl > to GHC, and then look for the function Main.eval. You'll see > that eval has a shape like > > eval (Var x) = let ... in \env -> ... > eval (Add u v) = let ... in \env -> ... > > This is bad, because eval is building a function closure for > the \env, instead of taking its two arguments together as does > simplEval. We'd prefer > > eval (Var x) env = let ... in ... > eval (Add u v) env = let .. in ... _______________________________________________ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
