Zip Collections

[dtiw...@gmail.com]

Is there any utility which could allow us to zip two collections in Guava?

[Olivier Grégoire]

It's often asked and there's an issue opened for it: https://github.com/google/guava/issues/677

Regards,

Olivier

Le lun. 3 avr. 2017 à 16:27, <dtiw...@gmail.com> a écrit :

Is there any utility which could allow us to zip two collections in Guava?

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[Pete Gillin]

Guava 21 introduced Streams.zip, which takes a Stream<A> and a Stream<B> and a BiFunction<? super A,? super B,R> which gives you a Stream<R>. If you have Collections, you could stream both of them, and if you need a Collection back rather than a Stream you could collect it, say using toImmutableList. (The problem with doing this directly in Collections is that there's no good return type since Guava has no Tuple types. It's better for your code, via the BiFunction, to state how the elements ought to be combined.)

Pete.

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[Tim Peierls]

StreamEx has good support for this sort of thing:

https://amaembo.github.io/streamex/javadoc/one/util/streamex/StreamEx.html#zipWith-java.util.stream.Stream-

and other zip methods.

StreamEx and Guava play pretty well together.

--tim

On Tue, Apr 4, 2017 at 1:58 PM, 'Pete Gillin' via guava-discuss <guava-...@googlegroups.com> wrote:

Guava 21 introduced Streams.zip, which takes a Stream<A> and a Stream<B> and a BiFunction<? super A,? super B,R> which gives you a Stream<R>. If you have Collections, you could stream both of them, and if you need a Collection back rather than a Stream you could collect it, say using toImmutableList. (The problem with doing this directly in Collections is that there's no good return type since Guava has no Tuple types. It's better for your code, via the BiFunction, to state how the elements ought to be combined.)

Pete.

On Mon, 3 Apr 2017 at 15:34 Olivier Grégoire <ogre...@gmail.com> wrote:

It's often asked and there's an issue opened for it: https://github.com/google/guava/issues/677

Regards,

Olivier

Le lun. 3 avr. 2017 à 16:27, <dtiw...@gmail.com> a écrit :

Is there any utility which could allow us to zip two collections in Guava?

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