Community

Chat Logs

Tuesday, July 7, 2026

00:51:52acidjnknvm, extract that one method, and it's fine
00:52:08* Fiji_ joined #java
00:54:53* Nnnavd joined #java
01:08:33* ChaiTRex joined #java
01:15:37jreicheracidjnk: I'm not sure syntax is your problem there. Why are you flatmapping onto a lambda that produces a stream?
02:02:31* m joined #java
02:17:51* jamezp joined #java
02:23:46* Odyss3us joined #java
03:01:35* ForeverDreaming joined #java
03:39:54* michele joined #java
03:54:17* stfstfm joined #java
05:15:09* ferdna joined #java
05:24:17* stfstfm joined #java
06:13:01* domicron6 joined #java
06:48:51* Gaz7051122720067 joined #java
06:58:06* rvalue joined #java
07:09:40* kusanagi joined #java
07:32:20* taylan joined #java
07:49:05* Afroboy joined #java
07:56:05* leppard joined #java
08:11:09* mindCrime joined #java
08:19:00* Maxxed joined #java
08:30:25* stfstfm joined #java
08:38:00* yeahitsme joined #java
09:01:44* jwisbell35 joined #java
09:18:45* acidjnk joined #java
09:26:30* leppard joined #java
09:28:23* Skynx joined #java
09:49:33* MikeBux joined #java
10:33:52* leppard joined #java
10:38:14* airaqi joined #java
10:42:57* airaqi joined #java
11:05:58* erbium joined #java
11:16:37acidjnkthe logic is correct jreicher, but it shows that readability is not good enough yet, although I also did not provide all the context. I ended up making this utility method, surprised that it did not exist in the core API yet. It's like zip, but cartesian instead of pair-wise: https://pastebin.com/UxGdLa8t
11:39:11* stfstfm joined #java
11:48:31* Betal joined #java
11:52:58dreamrealacidjnk: what id this trying to do?
11:54:36* stfstfm joined #java
11:56:00acidjnkWhat I'm using it for is a JUnit DynamicTest and @TestFactory. I have a list of first arguments, a list of second arguments, and need to call a parameterized test with all possible combinations. Some JUnit library has a @Cartesian annotation or something like that with similar effect.
11:56:18ParaCartesian product as a stream assumes extrapolating a two-dimensional result from a sequence. That's not very generalizable -> no method in API.
11:57:14ParaAs a group of operations that's zip + reduce, though. I don't think n-stream zipper exists in core API either.
11:58:09Para(per dimension)
11:58:27dreamrealpara's right, I actually use a set of nested values in a methodsource to do it: for(var v1 :setOfV1s) { for(var v2: setofV2) { ... compose set here } }
11:58:34Parathis guy's done a pretty good zipping gatherer https://www.morling.dev/blog/zipping-gatherer/
11:58:34javabotPara's title: "A Zipping Gatherer - Gunnar Morling"
11:59:22ParaHm, I think I've seen this SO post before :) https://stackoverflow.com/questions/17640754/zipping-streams-using-jdk8-with-lambda-java-util-stream-streams-zip
11:59:23javabotPara's title: "functional programming - Zipping streams using JDK8 with lambda (java.util.stream.Streams.zip) - Stack Overflow"
11:59:35acidjnkjOOλ has something similar, but as two calls. It has a crossjoin to create the tuples, and then it's just mapping to a BiFunction. I was considering to just use that as a library.
11:59:54* dreamreal shrugs. Do what works for you.
12:02:01acidjnkwhen you can use methodsource, @CartesianTest would also work: https://junit-pioneer.org/docs/cartesian-product/ Mine can't use method source, because it is abstract, and I need the elements defined by the corresponding implementations.
12:02:01nevetCartesian Product of Parameters
12:03:27dreamrealoooo I need to look at that, I've been doing it manually
12:03:44dreamrealI keep thinking junit's just not all that flexible, people keep adding it.
12:04:02dreamrealoh, of course, that's not junit proper, that's why
12:04:23acidjnkyes. I looked at all sorts of alternatives before I resorted to @TestFactory
12:22:43* GreenResponse joined #java
12:22:54* leppard joined #java
12:36:17jreicheracidjnk: I never said the logic was wrong. I'm asking why you've chosen to implement it using this combination of operations.
12:40:54* sonOfRa_ joined #java
12:46:39* jamezp joined #java
12:55:25* ForeverDreaming joined #java
12:55:53acidjnkReasonable question, but from the question itself I concluded: Ok, it's not obvious that I want to call a method with all possible combinations of the elements from the two sources.
12:58:06* Afroboy joined #java
13:59:30* mindCrime joined #java
14:33:32* metalmaniac joined #java
14:37:44* Anaphaxeton joined #java
14:38:34* leppard|2 joined #java
14:51:29* Fiji_ joined #java
15:01:52* ChaiTRex joined #java
15:28:39* WizJin joined #java
16:46:59* ferdna joined #java
16:54:07* stfstfm joined #java
16:55:25* acidsys joined #java
17:25:45* acidsys joined #java
17:55:46* hwpplayer1 joined #java
18:30:34* Anaphaxaway joined #java
18:33:50* Ragnor joined #java
19:01:12* domicron joined #java
19:03:15* stfstfm_ joined #java
19:25:03* hwpplayer1 joined #java
20:23:21* jbosmans joined #java
20:32:24* sonOfRa joined #java
20:43:51* domicron1 joined #java
21:09:04* monkeyPlus joined #java
21:20:35* ernimril joined #java
21:40:10* metalmaniac joined #java
21:56:22* acidjnk_new joined #java
22:02:38* jreicher joined #java
22:54:10* jamezp joined #java
23:20:04* Fiji_ joined #java
23:25:34* Odyss3us joined #java