Fun 🐱

Overview

Fun is simple functional programming library written in C#, inspired by Scala.

Getting started

Fun is available as a stand-alone library via nuget. Here’s an example nuget packages.config file that pulls in Fun:

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="Fun" version="1.0.0" targetFramework="net45" />
</packages>

Example usage:

Fluent function application:

"945bd525-d80e-4055-a762-7256b4b38403".Apply (Guid.Parse);

Immutable Unit data type, the empty tuple ():

Func<String, Unit> print = (z) => {
    Console.WriteLine (z);
    return Unit.Value;
};

Fluent if - else statements:

Int32 x = 42;

If.Else (	
    x % 2 == 0, () => "x is even",
    /* else */  () => "x is odd")
  .Apply (print);

If.Else (
    x % 3 == 0, () => "x is a multiple of three",
    x % 2 == 0, () => "x is even",
    /* else */  () => "x is odd")
  .Apply (print);

Immutable Option data type:

var oh = Option.Apply ("hello");
var ow = Option.Apply ("world");

oh.FlatMap ((h) => ow.Map ((w) => h + " " + w))
  .ValueOrElse ("foobar")
  .Apply (print);

Option.Apply (Console.ReadLine ())
      .Match (
         (z) => z,
	 () => "Read line returned null!")
      .Apply (print);

Immutable Either data type:

Either.Left <String, Int32>("foobar")
      .MapLeft (z => z.ToUpper ())
      .Left
      .ValueOrElse ("!")
      .Apply (print);

Either.Right <String, Int32> (42)
      .Match (
         (left) => left.Length,
         (right) => right * 2)
      .ToString ()
      .Apply (print);

Immutable Try data type:

Try.Apply (() => Environment.GetEnvironmentVariable ("HOME"))
   .Match (
      (success) => success,
      (failure) => "foobar")
   .Apply (print);


Try.Apply (() => Environment.GetEnvironmentVariable ("HOME"))
   .Flatten ((failure) => "foobar")
   .Apply (print);
	

License

Fun is licensed under the MIT License; you may not use this software except in compliance with the License.