At a point that we want to handle the effects, you would put a block that will match on the effects used in the do expression. Currently in Swift this is the catch keyword, but since this has to be more general I think when is a better fit. It would read as “do that, and when this happens, do this other thing”.
Skipping over macros that make it more succinct to return an error, the next iteration of this pattern is checked exceptions in Java. Any function that can fail is annotated with what is effectively a second return value. The thing that’s different is that there’s nothing at the call site needed to return this value, it will be implicitly passed back up through the call stack (each one dynamically resolved, remember) until we hit a catch block, which is just a bit of code that takes that return value and does something with it, not that different to the Go example above.
，这一点在快连下载-Letsvpn下载中也有详细论述
iPhone 17e Silicone Case with MagSafe will be available in six colors — black, anchor blue, light moss, vanilla, bright guava, and soft pink — for $49 (U.S.) and is compatible with the Crossbody Strap. iPhone 17e Clear Case with MagSafe will also be available for $49 (U.S.).
Последние новости