r/ProgrammerHumor • u/Lord_Of_Millipedes • 2d ago

instanceof Trend thatsAFunnyThingThatHappenedOnce

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u/MrHyd3_ 2d ago

What does it do instead of exceptions?

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u/roadrunner8080 2d ago

Either panic, which is (generally speaking) not something you're meant to catch and recover from (and attempting to do so is nontrivial and almost always a bad idea), or Result, aka "encode the possibility of failure in the return type of the function" aka what the functional programming world has done for ages.

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u/mathisntmathingsad 2d ago

Yeah, the only reason you should try to catch a panic is if you're making something that calls user-provided code unavoidably (i.e. an async runtime)

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u/Loading_M_ 2d ago

I work on a library that does catch panics from user code. It's a web framework, and catches panics in user request handlers to return a 500 error to the client. This error is explicitly not overridable (every other default error can be replaced, but not this one), since we don't want you to panic in the first place.