Difference between revisions of "La ce folosim operatorul !! (dublu semn de exclamare) ?"
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+ | [[Category:Ro]] | ||
+ | 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 [[Category:Ro]] [http://www.haskell.org/haskellwiki/Category:Ro Categories:Ro] | ||
+ | ---- | ||
+ | [http://www.haskell.org/haskellwiki/Ro/Haskell <= Inapoi la pagina principala Ro/Haskell. ]<br> <br> | ||
+ | [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.