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Announcing Rust 1.76.0 (blog.rust-lang.org)

submitted 7 months ago by snaggen@programming.dev to c/rust@programming.dev

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[–] anlumo@feddit.de 16 points 7 months ago (1 children)

Oh, inspect has finally arrived! That will help a ton with debug logging.

[–] lambda@programming.dev 6 points 7 months ago* (last edited 7 months ago) (3 children)

Do you mind explaining? Maybe with the context of another languages equivalent?

[–] anlumo@feddit.de 12 points 7 months ago (2 children)

let bar: Result<T, E> = ...;
let foo = bar.inspect(|value| log::debug("{}", value));

is equivalent to

let bar: Result<T, E> = ...;
let foo = bar.map(|value| {
    log::debug("{}", value);
    value
});

[–] xav@programming.dev 1 points 7 months ago

Warning: in the first case "value" is actually a shared reference, not a value.

[–] lambda@programming.dev 1 points 7 months ago

Elegant. Thanks!

[–] GissaMittJobb@lemmy.ml 2 points 7 months ago

Looks vaguely like Stream::peek from Java, I think? There's an equivalent method in Iterator::inspect.

[–] owsei@programming.dev 1 points 7 months ago* (last edited 7 months ago)

it's just a way to use map with a reference instead of the value, by what I understood.

could be usefull for logging values in a Result so you can see it. However I think you can already do that by just mapping and returning the variable.