functional-workshop

functional programming principles applied in C#

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Actions

Actions are sugar syntax to create delegates that the .NET framework gives us. These never return a value therefore are always void, and can take up to sixteen generic parameters as input.

• The void return type in FP is called unit
• unit is expressed as () in arrow notation

using System;
using System.Diagnostics;

internal static class TestActions
{
    internal static void Run()
    {
        // string -> ()
        Action<string> consoleLoggerHandler = ConsoleLogger;
        Action<string> debugLoggerHandler = DebugLogger;
        Action<string> allConsoleHandlers = consoleLoggerHandler + debugLoggerHandler;

        consoleLoggerHandler("This goes to the console");
        debugLoggerHandler("This goes to the debug");
        allConsoleHandlers("this goes to all");
    }

    private static void ConsoleLogger(string message) => Console.WriteLine(message);

    private static void DebugLogger(string message) => Debug.WriteLine(message);
}