Turns out, with generics coming with Go 1.18 we can implement type-safe Either, Maybe, and many other useful containers.
This means we can even pretend that we don’t have if err != nil idiom and chain operations like functional programmers do.
Compare classic and functional example below:
To make it work we need a little library.
Honestly, it’s simply fun that it works. I don’t think it’s a good idea to actually use it in serious Go code. Serious Go code must be dead simple.