Zig: Add a method to return length of ArrayList

[mjoud]

Previously there was ArrayList.count() (removed in c3d8b1f) and then ArrayList.len (removed in dd570db). ArrayList.items.len is now the way to determine the number of items . I'd prefer a count() method; it could simply return items.len just like the previously removed count().

[ifreund]

I think that would violate the "only one obvious way to do things" point of the zig zen. I personally don't see what's wrong with using items.len, having a dedicated method to access this value seems like a pointless abstraction.

[mjoud]

I'm perfectly fine with that but this must eventually be properly documented. Knowing that ArrayList has an internal slice called items is not obvious unless you read the source.

Edit: To further clarify, it could be viewed as a leaking implementation detail and requires a stable implementation.

[andrewrk]

items is part of the API. It is not an internal implementation detail.