Difference between revisions of "La ce folosim operatorul !! (dublu semn de exclamare) ?"

From HaskellWiki
Jump to navigation Jump to search
(Deleting page that hasn't been edited for over 10 years)
m (Minor formatting changes)
 
(One intermediate revision by one other user not shown)
Line 1: Line 1:
  +
[[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. ]

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.

Retrieved from "https://wiki.haskell.org/index.php?title=La_ce_folosim_operatorul_!!_(dublu_semn_de_exclamare)_%3F&oldid=64112"