Streams design strawman

Rémi Forax forax at
Sun Apr 22 03:45:06 PDT 2012

Hi Brian, hi all,
Trying to catch up ...
I've some troubles to understand why groupBy() returns a stream (or a 


On 04/19/2012 04:49 AM, Brian Goetz wrote:
> I've posted a strawman writeup of the key concepts we're thinking about
> for the libraries at:
> The design is still rough, and we've started checking in an even rougher
> implementation into the lambda repository.  There are lots of omissions,
> errors, and open questions.  But it is at a point where we've got a
> consistent enough strawman for people to start playing with it, and
> share their experience.
> As the document suggests, there are a large number of open issues, and
> we've temporarily ignored these for the purposes of pulling together
> something that captures the basic functionality.  We've deliberately
> deferred addressing many sticky issues including attachment to
> collections, primitive specialization, checked exceptions, infinite
> streams, IO-backed streams, nulls, and of course, naming.
> These are all sticky issues, and we'll get to them, but for now, I'd
> like to leave them be for a little while longer, so that we can shake
> out the key functionality first.
> What I am asking of the community is: TRY OUT THE CODE.  *The single
> most valuable thing that the community can do to help move this effort
> forward, and improve the quality of the result, is to try out the code
> early and often.*  (A single practical experience report is worth many
> armchair observations and suggestions!)
> What's in the lambda repo right now is still a little rough, but within
> the next few days it should be cleaned up enough for people to be able
> to try it out on their code.  We would love it if people could try to
> lambdify some small bit of their code base, and report back on how it
> worked -- whether it worked great, or not.  Also valuable is where you
> got stuck, such as "I had trouble converting this pattern to use the new
> libraries."

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