using System;

public class Program

{

    public static void Main()

    {

        // https://www.youtube.com/watch?v=KSs5UR4jC1Q&ab_channel=ThePrimeTime&t=12m12s

        // "Maybe we should start making it normal to do only read only" / ThePrimeagen

        // Let us test that...

        string message = "Hello World";

        Method(message); // passed as immutable aka "const"/"let"

        Console.WriteLine(message);

        RefMethod(ref message); // passed as mutable aka by reference

        Console.WriteLine(message);

        // Conclusion: C# rocks! :)

    }

    // No worries, normal C# methods does not modify. It is the default to not affect what is provided.

    public static void Method(string s)

    {

        s = "Won't be modified";

    }

    // You have to specifically specify that the passed is by reference, and is allowed to change.

    public static void RefMethod(ref string s)

    {

        s = "Has been modified";

    }   

}