Galaxus.Functional is a package that aims to bring FP-style features to C#. Note though, that this is not true functional programming; this package contains some useful abstractions often found in functional languages.

The style is greatly inspired by the way Rust does this. If you have worked with Rust's std::option or std::result, you will probably feel right at home.

There currently are the following abstractions found inside Galaxus.Functional:

A type used to explicitly mark the presence or absence of a value. This is an alternative to checking for null and is similar to e.g. Haskell's Maybe or Java's Optional.

A type for something that does not exist, similar to void - except that it can be returned and stored as a value.

A type that can be one of several variants, sort of like a discriminated union or an enum with a stored value for each enum member.

A type that explicitly propagates success or error to the caller, similar to used explicitly annotated exceptions. It can be seen as a specialization of an Either with the second variant being an error.

No matter how small, we value every contribution! If you wish to contribute,

1. Please create an issue first - this way, we can discuss the feature and flesh out the nitty-gritty details
2. Fork the repository, implement the feature and submit a pull request
3. Once the maintainers have released a new version, your feature will be part of the NuGet package

And always remember the golden rule for every contribution: Be excellent to each other!