Unwrap means it forces to evaluate the result as an ”ok value”. If it’s an ”error value”, it will crash. It’s a bad practice to rely on it, as it’s one of the most common ways a Rust programs can crash.

Rust offers many options to handle errors that don’t risk crashing. For example, unwrap_or_default, which means ”if it’s an error value, use the default value for this type, such as 0 for integers”

[–] Korne127@lemmy.world 16 points 2 weeks ago (5 children)

I mean using unwrap is not bad practice if the value is guaranteed to not be none, which can happen frequently in some applications.

[–] mobotsar@sh.itjust.works 4 points 2 weeks ago* (last edited 2 weeks ago) (3 children)

If it's guaranteed to not be None, why is it an Option?

[–] emilgardis@lemmy.ml 3 points 2 weeks ago

Here's a bad example but hopefully captures the why. https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=43d055381e7bb52569c339d4526818f4

We have a condition we know must be satisfied (the option will always be Some), but cant prove in code.

load more comments (2 replies)

load more comments (3 replies)

load more comments (6 replies)