La ce folosim operatorul !! (dublu semn de exclamare) ?
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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
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