[adriaanm]

As the Scala team lead at Lightbend, I'm truly saddened to see posts like this. It couldn't be farther from our intentions and interests! We absolutely want outstanding Scala documentation, and would never stand in the way of improving them in any way.

My whole team has worked extremely hard this year to bring you the best 2.12 compiler we can. We also spend as much time as possible helping out with polishing documentation, but we feel a coordinated push for better documentation belongs under the umbrella of the Scala Center (whose mission is to "Independently guide and support the Scala community" and to "Provide deep, and quality, educational materials for Scala"). We'll be thrilled to collaborate, but we (as veteran Scala users) are not the best placed to write getting started guides.

EDIT: It was brought to my attention that my comment about the Scala Center could be misinterpreted. I meant to say I would support a proposal to the Scala Center advisory board about improving Scala's documentation, with a focus on the getting started experience.

[thisone]

Let me give you a 'fer instance' (this may be the only one that exists, but it's one that had me WTFing until I found the correct documentation to read via stack overflow)

Calling grouped on a Seq.

I've been playing around with some API requests, and needed to batch a long Seq to make reasonable sized GET requests.

So I called grouped on a Seq, then to sanity check I called .length on the grouping.

Then suddenly I had an empty iterator.

Maybe I should have known better, yeah, but the documentation I was reading http://www.scala-lang.org/docu/files/collections-api/collect... doesn't mention this fact about iterators. Again, maybe I'm the only person in the world who didn't realise the problem with calling .length on what I thought of as a regular old batched set.

It wasn't until I hit on the right google combination that I found http://www.scala-lang.org/api/current/#scala.collection.Iter... from a stack overflow reference, and the lightbulb finally went on.

[adriaanm]

Thanks for the example. We agree that this is a tricky part in the collections. For Scala 2.13, our headline feature will be simplifying/refining the collections API. One of the areas we'd like to improve is to make the transitions from eager to lazy more clear. Also, we'd like to keep immutable (more) separate from mutable collections. Once we switch gears from 2.12.0 to 2.13 milestones, we'll be sure to provide a convenient way to share gotchas like this, so we can see how to prevent them.