> unknown function call is expensive So, higher order function always slow. Thus, to improve performance, one should use for/fold, for/list, ... and never use map, foldl, build-string, ... with lambda. Is it correct?
Sun, 3 Aug 2014 13:15:57 -0400 от Matthias Felleisen <matth...@ccs.neu.edu>: > >Because build-string calls an unknown function 1000 x 100000 times, and an >unknown function call is expensive. > >Racket could possible collapse all modules and perform additional in-lining >optimizations eventually, which may help here. But it doesn't yet. > >-- Matthias > > > >On Aug 3, 2014, at 5:15 AM, Roman Klochkov wrote: >>Are higher order function always slow? >>... >>--- >> >>So I see, that build-string version is about two times slower, than >>set-in-the-loop. Why so much? I expected about 10-20% difference. >>-- >>Roman Klochkov ____________________ >> Racket Users list: >> http://lists.racket-lang.org/users > -- Roman Klochkov
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