Queue: take for more than one record

FS2 Queue’s had methods that would allow you to take a chunk of records, which were really convenient. The behavior would be that we would run the tryTake method until N was hit, or None was returned. I would like to see the same in the Cats Effect queue. Something like this:

def tryTakeChunk(
        maxN: Int
      )(implicit A: Async[F]
      ): F[List[A]] = {
      A.tailRecM[(List[A], Int), List[A]](
        (List.empty, 0)
      ) { case (list, i) =>
        if (list.size === maxN) list.reverse.asRight.pure[F]
        else {
          queue.tryTake.map {
            case None => Right(list.reverse)
            case Some(x) => Left((list.prepend(x), i + 1))
          }
        }
      }
    }

[vasilmkd]

Thanks @SystemFw and sorry. To everyone offended by my previous comment, I apologize. I don’t think std is bad as an idea or that it shouldn’t exist. I feel that not enough care was put in (starting from me, I have written a lot of code for it) to make the implementation more flexible in terms of evolution. I see it as a personal failure and every feature request that I read reminds me of it.

[SystemFw]

cats-effect-std was put together haphazardly and without much thought.

I disagree with this and I think you’re being far too harsh (including to yourself).

It has a lot of growing up to do

Potentially, yes. The discussions in this wave of feature requests are good.

Also think about how Resource is going to evolve

If Resource is going to evolve. The importance of having stable std is far greater than relaxing constraints here and there.

I dislike std, it was an afterthought.

It certainly wasn’t an afterthought, we debated both the general strategy of a std module and the specific components for quite a long time in CE2. I think the current situation with a richer std is miles better for end users than the scattered approach we used to take. It’s always hard to figure out what to include in a std module, but not providing one is very defeatist (lots of precedent in all directions from stdlib in any language)