Collectors update

[Brian Goetz]

Are there any other comments besides the concern about using arrays for 
partition?

On 1/29/2013 5:34 PM, Brian Goetz wrote:
> I've done some refactoring in Collectors to address some issues,
> including approachability issues that were raised by Kevin.  See if you
> like them.
>
> 1.  Rename to more verby names.  We now have
>    groupingBy
>    groupingReduce
>    joiningWith
>    partitioningBy
>
> instead of groupBy/mappedTo/partition.  This is designed to make it more
> clear what is going on when you read code like:
>
>    stream.collect(groupingBy(Foo::getBar))
>
> by making it clear that groupingBy is not an action but a way of
> describing the desired collecting.
>
> 2.  Break groupBy into two groups, groupingBy and groupingReduce.  While
> the distinction is somewhat arbitrary since groupBy *is* a reduce, it is
> now more consistent with the method naming on Stream.
>
> 3.  Rename mappedTo(T->U) to joiningWith.
>
> 4.  Rejigger Partition to return an array again, with an explicit lambda
> (which will likely be an array ctor ref) to make the array.  Eliminated
> the silly Partition class.
>
> 5.  Add more tests -- we now have full test coverage on groupingXxx but
> not yet the others.