this post was submitted on 13 Sep 2024
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Programming
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One problem with exceptions is composability.
You have to rely on good and up-to-date documentation or you have to dig into the source code to figure out what exceptions are possible. For a lot of third party dependencies (which constitute a huge part of modern software), both can be missing.
Error type is a mitigation, but you are free to e.g. panic in Rust if you think the error is unrecoverable.
A third option is to have effect types like Koka, so that all possible exceptions (or effects) can be checked at type level. A similar approach can be observed in practical (read: non-academic) languages like Zig. It remains to be seen whether this style can be adopted by the mainstream.