[uticus]

What language typically returns the `Either<Error,Success>` you refer to here? I get (and love) the idea but have never seen it in official documentation (sure I could go off the beaten path and implement in my language of choice).

Also, did you come up with this on your own, or were you exposed to it?

[oasisaimlessly]

* Rust: https://doc.rust-lang.org/std/result/

* Haskell: https://hackage.haskell.org/package/base-4.19.1.0/docs/Data-...

* C++: https://en.cppreference.com/w/cpp/utility/expected/value

[bedobi]

not as many languages as you'd hope unfortunately, but plenty do (see eg other reply you got, there are more still including F# etc etc)

+ other languages get close, eg Kotlin has nullable types (which is a poor substitute) and Result (which is also poor because it's not a true Either)

that said lots of languages these days have libraries that do it (Arrow, Vavr and countless others)

IMO the killer simple language that Go tries and fails to be would be something like a Kotlin+Arrow with heavily reduced syntax and features, eg

no exceptions (use Either or a correct Result type)

no loops (use map, fold etc)

no nulls (use a correct Option/Maybe type)

etc etc

= in such a language, we learn that methods return things, those things will be what they say they are (guaranteed by the compiler), they will tell you what you can do with them, and if a program compiles, you can be pretty damn sure it works as intended

insert "all the languages are broken, I should create a new language" meme here...

[neonsunset]

C# gets pretty close with NRTs, pattern matching, terse record declaration and task-based async syntax, lambdas and Result libraries if you like those. Also nicely builds to self-contained binaries, both JIT and AOT.