Difference between revisions of "La ce folosim operatorul !! (dublu semn de exclamare) ?"
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+ | [[Category:Ro]] |
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+ | Este folosit pentru a extrage al n-lea element dintr-o lista, n fiind numar intreg. |
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+ | |||
+ | '''Iata un exemplu de dialog cu interpretorul:''' |
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+ | |||
+ | Prelude> :t (!!) |
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+ | |||
+ | (!!) :: [a] -> Int -> a |
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+ | |||
+ | Prelude> (!!) [1,2,3,5] 0 |
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+ | |||
+ | 1 |
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+ | |||
+ | Prelude> (!!) [1,2,3,5] 1 |
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+ | |||
+ | 2 |
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+ | |||
+ | Prelude> (!!) [1,2,3,5] 2 |
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+ | |||
+ | 3 |
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+ | |||
+ | Prelude> (!!) [1,2,3,5] 3 |
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+ | |||
+ | 5 |
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+ | |||
+ | Prelude> (!!) [1,2,3,5] 4 |
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+ | |||
+ | Program error: Prelude.!!: index too large |
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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. ] |
Revision as of 15:18, 6 February 2021
Este folosit pentru a extrage al n-lea element dintr-o lista, n fiind numar intreg.
Iata un exemplu de dialog cu interpretorul:
Prelude> :t (!!)
(!!) :: [a] -> Int -> a
Prelude> (!!) [1,2,3,5] 0
1
Prelude> (!!) [1,2,3,5] 1
2
Prelude> (!!) [1,2,3,5] 2
3
Prelude> (!!) [1,2,3,5] 3
5
Prelude> (!!) [1,2,3,5] 4
Program error: Prelude.!!: index too large
Pagina indexata la indexul Categories:Ro
<= Inapoi la pagina principala Ro/Haskell.
<- Inapoi la Intrebarile incepatorului Ro/Haskell.