Hi,
On Dec 2, 9:06 pm, ataggart <[email protected]> wrote:
> > I'd like to understand the (probably well-grounded) reason for that.
> > As far as I can see PersistentList extends Counted, so the check for
> > the index-range should at least be possible. However, I think people
> > would expect an equality check in the background, which OTOH would be O
> > (N), probably.
>
> > Kind regards,
> > Stefan
>
> That's because contains? checks for keys not values. Since a list
> isn't associative (unlike vectors and maps), it doesn't have keys,
but at least the position within the list could be interpreted as the
key, although I personally would prefer if the
items themselves would count as keys.
> thus contains? doesn't apply.
But the implementation takes special care even of strings and arrays.
>From the website I got the impression that lists would be a collection-
type ("Lists are collections."), and the arglist of contains? says it
expects a coll.
> I too was first thrown off by assuming
> contains? worked on the values of a collection;
So, that makes two already ;-)
Please don't get me wrong. No criticism here about doc-code-
differences or about the decision to not support lists in contains?.
I'm just asking for the reason.
Kind regards,
Stefan
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