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Functional Java and lack of tail call optimization

 
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Hello Ben, what are your thoughts on Java's lack of tail call optimization? How much of a limitation is it? Also, do you discuss this in your book and suggest ways to get around it?
 
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Hi Junilu!

Personally, I see recursion only as an appropriate tool for a few use-cases, as often it's not easy to wrap your head around more complex examples.
And the lack of tail-call optimization introduces another factor against it for bigger data structures.

In the recursion chapter, I mention the lack of TCO and the problem of StackOverflowErrors that might follow.
I didn't find a "nice" way around it and link to the book's code repository, where I talk about using a Stream with a custom type that works like a recursive call but with a constant stack depth.
However, it's more of a proof of concept than an actual suggestion you should use in your code.

https://github.com/benweidig/a-functional-approach-to-java/blob/main/part-2/12-recursion/other/stream-recursion.md

Project Loom will introduce stack unwinding, which hopefully improves the situation for recursion and TCO in Java.
 
Don't get me started about those stupid light bulbs.
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