Difference between revisions of "La ce folosim operatorul !! (dublu semn de exclamare) ?"
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Prelude> (!!) [1,2,3,5] 1 |
Prelude> (!!) [1,2,3,5] 1 |
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Prelude> (!!) [1,2,3,5] 2 |
Prelude> (!!) [1,2,3,5] 2 |
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Program error: Prelude.!!: index too large |
Program error: Prelude.!!: index too large |
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| + | [http://www.haskell.org/haskellwiki/Ro/Haskell <= Inapoi la pagina principala Ro/Haskell ] |
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Revision as of 19:39, 5 November 2007
Este folosit pentru a extrage al n-lea element dintr-o lista, n fiind numar intreg.
Aruncati o privire aici:
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 <= Inapoi la pagina principala Ro/Haskell