C Sharp

The example is simplified, but I dislike returning null in my own code. The function will always execute, left or right doesn't matter it's mapped across in the ResultObject class.

The function must return an IResult, the ResultObject analyzes the IResult checking for IFail or IOk. If it's IOk the value of type T is retrieved from the Value property of the IOk object and returned, the Some property defaults to true. If the IResult is an IFail, Some is set to false, it copies the message from the IFail object into the ResultObject, and returns the value the was supplied to its constructor.

I'm just sharing something I find useful, and I hope I can make it useful for others as well. Thanks for the questions.

Check the edit on the post, I thought I had linked to the GitHub page but I guess the image overrides that.

Link: https://github.com/Andy3432344/SafeResults

Nulls are famously called the billion dollar mistake, and for good reason.

Option types are the answer to that problem, because they make the optionality explicit and require one to handle it or propagate it.

That being said: as someone that does functional programming professionally, this looks kinda janky, to me. But the good news is that C# is actually adding support for discriminated unions finally (seriously, it's been waaaay too damn long): https://github.com/dotnet/csharplang/blob/18a527bcc1f0bdaf542d8b9a189c50068615b439/proposals%2FTypeUnions.md

With discriminated unions, you can finally comfortably work with Option/Result types natively.