On 2008 Jul 11, at 19:46, Mitar wrote:
It is somehow award that passing function as an argument slow down the program so much. Is not Haskell a functional language and this such (functional) code reuse is one of its main points?
That is in fact the case; GHC's version of various Prelude functions refactors them to avoid passing functional arguments. IIRC the problem is that, while Haskell is indeed functional, passing a polymorphic function as an argument causes the runtime to have to look up which type is needed for every call, whereas if it's factored out it can be computed only once and (implicitly) let-bound. -- brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery@kf8nh.com system administrator [openafs,heimdal,too many hats] allbery@ece.cmu.edu electrical and computer engineering, carnegie mellon university KF8NH