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Is it better to check if a file exists before trying to load it, or to try to load it, and catch the error and move on? (lemmy.ml)

submitted 2 months ago by Binette@lemmy.ml to c/learn_programming@programming.dev

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For context, I am trying to do a save system for a game.

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[–] Binette@lemmy.ml 3 points 2 months ago (1 children)

I'm using Rust and Bevy, with bevy_moonshine for saving

[–] BatmanAoD@programming.dev 3 points 2 months ago

Do you mean moonshine_save? Does it even provide an API for loading that doesn't return a Result with a possible LoadError?

Rust doesn't generally "throw" errors, it returns them; and generally, function APIs will guide you in the right direction. You generally should not use unwrap() or expect() in your finished code (though the unwrap_or... variants are fine), which means that you must handle all errors the API can return programmatically (possibly just by propagating with ?, if you will instead be handling the error in the caller).