snaggen@programming.dev to Rust@programming.dev · 10 months agoAnnouncing Rust 1.76.0blog.rust-lang.orgexternal-linkmessage-square23fedilinkarrow-up1101arrow-down10
arrow-up1101arrow-down1external-linkAnnouncing Rust 1.76.0blog.rust-lang.orgsnaggen@programming.dev to Rust@programming.dev · 10 months agomessage-square23fedilink
minus-squareanlumo@feddit.delinkfedilinkEnglisharrow-up18arrow-down2·10 months agoOh, inspect has finally arrived! That will help a ton with debug logging.
minus-squareλλλ@programming.devlinkfedilinkarrow-up6·edit-210 months agoDo you mind explaining? Maybe with the context of another languages equivalent?
minus-squareanlumo@feddit.delinkfedilinkEnglisharrow-up14arrow-down2·10 months agolet 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 });
minus-squarexav@programming.devlinkfedilinkarrow-up1·10 months agoWarning: in the first case “value” is actually a shared reference, not a value.
minus-squareGissaMittJobb@lemmy.mllinkfedilinkarrow-up2·10 months agoLooks vaguely like Stream::peek from Java, I think? There’s an equivalent method in Iterator::inspect.
minus-squareowsei@programming.devlinkfedilinkarrow-up1·edit-210 months agoit’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.
Oh,
inspecthas finally arrived! That will help a ton with debug logging.Do you mind explaining? Maybe with the context of another languages equivalent?
is equivalent to
Elegant. Thanks!
Warning: in the first case “value” is actually a shared reference, not a value.
Looks vaguely like
Stream::peekfrom Java, I think? There’s an equivalent method inIterator::inspect.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.