Difference between revisions of "La ce folosim operatorul !! (dublu semn de exclamare) ?"
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'''Iata un exemplu de dialog cu interpretorul:''' |
'''Iata un exemplu de dialog cu interpretorul:''' |
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| − | Prelude> :t (!!) |
+ | Prelude> :t (!!) |
| + | (!!) :: [a] -> Int -> a |
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| − | (!!) |
+ | Prelude> (!!) [1,2,3,5] 0 |
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| − | Prelude> (!!) [1,2,3,5] |
+ | Prelude> (!!) [1,2,3,5] 1 |
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| − | Prelude> (!!) [1,2,3,5] |
+ | Prelude> (!!) [1,2,3,5] 3 |
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| − | Prelude> (!!) [1,2,3,5] 3 |
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Latest revision as of 23:15, 5 April 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.