azdle ( azdle@news.idlestate.org ) to Rust@programming.devEnglish · 1 year agothings rust shipped without (2015)graydon2.dreamwidth.orgexternal-linkmessage-square17linkfedilinkarrow-up125
arrow-up125external-linkthings rust shipped without (2015)graydon2.dreamwidth.orgazdle ( azdle@news.idlestate.org ) to Rust@programming.devEnglish · 1 year agomessage-square17linkfedilink
minus-squareTehPers ( TehPers@beehaw.org ) linkfedilinkEnglisharrow-up1·1 year agoTheir suggested replacement is closer to C#'s is keyword: if foo is Some(foo) { // ... } The issue here is that we still have let-else, which can’t be translated as easily: let Some(foo) = foo else { todo!(); };
minus-squaresoc ( soc@programming.dev ) linkfedilinkEnglisharrow-up1·edit-21 year agoI don’t think the alternative to let-else is too bad.
minus-squareTehPers ( TehPers@beehaw.org ) linkfedilinkEnglisharrow-up1·1 year agoThat’s not an alternative, it’s removing let-else entirely. It’s equivalent to this: let i = if let Some(i) = opt_number { i } else { return 0; }; let-else is specifically a feature that allows you to use a refutable pattern to deconstruct a value by providing a diverging else branch.
minus-squaresoc ( soc@programming.dev ) linkfedilinkEnglisharrow-up1·edit-21 year agoRemoving let-else is the whole point of the linked article series: Being able to do to everything Rust does, but without Rust’s zoo of if-then-else, match, if-let, let-else etc.
Their suggested replacement is closer to C#'s
iskeyword:The issue here is that we still have let-else, which can’t be translated as easily:
I don’t think the alternative to let-else is too bad.
That’s not an alternative, it’s removing
let-elseentirely. It’s equivalent to this:let-elseis specifically a feature that allows you to use a refutable pattern to deconstruct a value by providing a divergingelsebranch.Removing
let-elseis the whole point of the linked article series:Being able to do to everything Rust does, but without Rust’s zoo of
if-then-else,match,if-let,let-elseetc.