How to check if a list contains an element?

[p-e-w]

The best I could come up with without using imperative constructs is

contains (list, element) =
  count [for (e in list) if (e == element) e] > 0;

which is ugly and horribly inefficient. I guess the efficiency problem could be solved using a while loop, but the code would be even uglier.

Might it make sense to add a built-in contains operator?

[doug-moen]

Thanks for the suggestion. It is now implemented.

[p-e-w]

Thanks for the quick followup 👍