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.

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