Functional data structures for C#
Functional code helps you fall into the pit of success! When it's easier to do the right thing than the wrong thing, people tend to do it right.
A value that might be absent. Instead of returning a null, return a Maybe with no value.
// We have a value!
return new Maybe<MyType>(value);
// We don't have a value!
return new Maybe<MyType>();
// Use either one!
string x = result.Map(x => x.Foo).Extract("Nothing!");A value that might be one of a few types. Good for error handling!
// We had no errors!
return new OneOf<Result, Error>(value);
// We had an error!
return new OneOf<Result, Error>(new Error("uh oh"));
// Use either one!
string x = result.Extract(x => x.Prop, e => e.Message);