D equivalent to Rust or Scala's Optional and Result and best practice ?

[Soulsbane]

On Monday, 18 October 2021 at 16:03:53 UTC, dangbinghoo wrote:
> hi,
>
> It seems that now we have `Optional` and `Result` packages in 
> Dub, are these enough or fully equal to Rust or Scala's 
> error-handling and pattern-matching?
>
> if these are enough for real-code, any best practice advice?
>
> thanks!

There is https://code.dlang.org/packages/optional plus a couple 
more available in packages.