About

JFomit.Functional - is a simple C# library designed to provide common functional types and operations on them.

So far this library has:

  1. An Option<T> type, which wraps an object that might not exist;
  2. A Result<T, E> type, which wraps an object that might not exist due to some error;
  3. A family of OneOf types, which are basically discriminated unions over 2 to 4 types.

The library also provides a set of common operations on these types:

using JFomit.Functional.Extensions;
using JFomit.Functional.Monads;
using static JFomit.Functional.Prelude;

Console.WriteLine("Enter a number:");

Option<int> parsedValue = Parse<int>(Console.ReadLine());
parsedValue.Select(n => n * n).Switch(
    some: (int value) => Console.WriteLine($"Your number squared is {value}!"),
    none: () => Console.WriteLine("Failed to parse a number :_(")
);

static Option<int> Parse<T>(string? s)
    where T : IParsable<T> => T.TryParse(s, null, out var value) ? Some(value) : None;

For more examples, check Examples.

Quick Start Notes:

Add a JFomit.Functional Nuget package to your project:

dotnet add package JFomit.Functional

Enjoy!

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