25 Jun
2009
25 Jun
'09
1:54 p.m.
On Thu, Jun 25, 2009 at 3:49 PM, John Meacham
However, if the algorithm takes a signifigant amount of time or resources, you may want to keep it in IO just so users can have control over exactly when and how often it is run.
If you had a pure function written in Haskell that used a lot of time and memory, would you put it in IO just so users can have control over exactly when and how often it is run? bigFatFunction :: Foo -> IO Bar bigFatFunction x = return . bigFatFunction $ x If the function really does use a lot of time and memory and your compiler is duplicating calls to it, then you have a pessimizing compiler and should file a bug. --Max