fulib

Yet another functional library for C#.

Inspired by article series and this beautiful library.

It revolves around class Result<T> and its extensions for chaining methods together.

Result<T> can be instantiated with either its value or exception/error message:

var successfulResult = Result<int>.Success(1);
var failedResult = Result<int>.Failure("something went wrong");
var failedResultWithException = Result<int>.Failure(new InvalidOperationException("Index cannot be negative"));

Methods on Result<T>:

Match
MatchTee
MatchAsync
MatchTeeAsync

Supported extensions so far:

Map
Apply
Tee
Bind

Result<T> has extensions for async version of it - Task<Result<T>>

Both Result<T> and Task<Result<T>> support traverse - applicative and monadic versions of it. For async tasks, it's possible to use applicative version, but not parallelize execution.

This package also includes LINQ extensions, so you can write your code like this:

var result = await
    from head in _headRepository.Get(headId)
    from body in _bodyRepository.Get(bodyId)
    from tail in _tailRepository.Get(tailId)
    select MakeCreature(head, body, tail);

As a bonus, there is implementation for Reader<E,T> and Middleware<T>. Examples can be found in this repository.

embarrassedmilk/fulib

fulib