Julia Sprawdź, czy element jest w tablicy
> a = [1, 2, 3, 4, 5];
> 6 ∉ a # true
> 6 ∈ a # false
#= The ∉ symbol can be typed in the REPL by typing \notin and then
hitting TAB. Of course, the ∈ symbol is also available as an alternative
to in by typing \in and hitting TAB. =#
Pouyan