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Avoiding if-else Hell: The Functional Style
(lackofimagination.org)
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this post was submitted on 24 Sep 2024
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Programming
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I try to prefer
.findAny()over.findFirst()because it will perform better in some cases (it will have to resolve whether there are other matches and which one is actually first before it can terminate - more relevant for parallel streams I think. findAny short circuits that) but otherwise I like the first. I'd probably go with some sort of composed predicate for the second, to be able to easily add new criteria. But I could be over engineering.I mostly just posted because I think not enough people are aware of the reasons to use findAny as a default unless findFirst is needed.
For me I have the habit of doing findFirst because determinism is important where I work. But I agree with you if determinism is not of importance.
I would only note that for the vast majority of my experience these streams can only return up to a single match. Determinism isn't really preserved by findFirst, either, unless the sort order is set up that way.
Finding the first Jim Jones in a table is no more reliable that finding any Jim Jones. But finding PersonId 13579 is deterministic whether you findFirst or findAny.
Perhaps you work in a different domain where your experience is different.