Difference between revisions of "Cum poate fi definit sequence ?"
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| + | '''sequence_''' transforma o '''lista''' de actiuni de IO () (sau alte actiuni monadice) intr-o '''singura''' actiune compusa. Ati putea face in C asa ceva ? Adica ati putea face in C o functie care transforma o lista de instructiuni intr-un bloc ? |
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<haskell> |
<haskell> |
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sequence_ = foldr (>>) (return () ) |
sequence_ = foldr (>>) (return () ) |
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</haskell> |
</haskell> |
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| + | ---- |
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| + | Pagina indexata la indexul [[Category:Ro]] [http://www.haskell.org/haskellwiki/Category:Ro Categories:Ro] |
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| + | ---- |
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| + | [http://www.haskell.org/haskellwiki/Ro/Haskell <= Inapoi la pagina principala Ro/Haskell. ]<br> <br> |
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| + | [http://www.haskell.org/haskellwiki/Intrebarile_incepatorului <'''-''' Inapoi la Intrebarile incepatorului Ro/Haskell. ] |
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Latest revision as of 21:45, 25 January 2008
sequence_ transforma o lista de actiuni de IO () (sau alte actiuni monadice) intr-o singura actiune compusa. Ati putea face in C asa ceva ? Adica ati putea face in C o functie care transforma o lista de instructiuni intr-un bloc ?
1) In do-notatie, in mod recursiv, sequence_ ar putea fi definit ca:
sequence_ :: [ IO() ] -> IO ()
sequence_ [] = return ()
sequence_ (a:as) = do a
sequence_ as
2) Vazut ca un foldr ar putea fi definit ca:
sequence_ = foldr (>>) (return () )
Pagina indexata la indexul Categories:Ro
<= Inapoi la pagina principala Ro/Haskell.
<- Inapoi la Intrebarile incepatorului Ro/Haskell.