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

From HaskellWiki
Jump to: navigation, search
(Deleting page that hasn't been edited for over 10 years)
m (Reverted edits by Tomjaguarpaw (talk) to last revision by Ha$kell)
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. ]

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.