Streams.concat for primitives

[Boaz Nahum]

It explains. Many thanks.

On Sun, Feb 17, 2013 at 9:57 PM, Brian Goetz <brian.goetz at oracle.com> wrote:

> Any plans to implement Streams.concat in case of IntStream ?
>>
>
> Not currently.
>
>
>  Another question, why concat is not  member of stream ?
>>
>
> It was, until we changed it.
>
> If you look at all the other methods of Stream, all the arguments to their
> methods are stateless.  Stream would have been an exception (so was
> into(collection)) and would have caused problems for defining stream
> pipelines as functions separate from their source (what we sometimes called
> "detached pipelines", were you would define the computational process
> X.filter(...).map(...).reduce(**...) separate form its source, so it
> would be a function from Stream to the reduction result, and therefore
> could amortize the pipeline setup over multiple uses (enabling further
> optimizations that are impractical for one-shot pipelines.))
>
> Further, the value of defining concat() as a stream method (and therefore
> make it eligible for chaining) is low, since you still have to set up the
> other pipeline and that often doesn't chain so well anyway.
>
>