Initial Commit (w/ Ch1Duck first implementation)

Ch1Duck/Ch1Duck.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net9.0</TargetFramework>
+        <LangVersion>latestmajor</LangVersion>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+</Project>

Ch1Duck/Duck.cs

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+namespace Ch1Duck;
+
+public abstract class Duck(IFlyBehaviour flyBehaviour, IQuackBehaviour quackBehaviour) {
+    public abstract void Display();
+
+    public void PerformFly() {
+        flyBehaviour.Fly();
+    }
+    
+    public void PerformQuack() {
+        quackBehaviour.Quack();
+    }
+}
+
+public class MallardDuck() : Duck(new FlyWithWings(), new NormalQuack()) {
+    public override void Display() {
+        Console.WriteLine("I'm a real Mallard duck");
+    }
+}

Ch1Duck/Fly.cs

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+namespace Ch1Duck;
+
+public interface IFlyBehaviour {
+    void Fly();
+}
+
+public class FlyWithWings: IFlyBehaviour {
+    public void Fly() {
+        Console.WriteLine("I'm flying!");
+    }
+}
+
+public class FlyNoWay: IFlyBehaviour {
+    public void Fly() {
+        Console.WriteLine("I can't fly");
+    }
+}

Ch1Duck/Program.cs

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+// See https://aka.ms/new-console-template for more information
+
+using Ch1Duck;
+
+Duck mallard = new MallardDuck();
+mallard.PerformQuack();
+mallard.PerformFly();

Ch1Duck/Quack.cs

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+namespace Ch1Duck;
+
+public interface IQuackBehaviour {
+    void Quack();
+}
+
+public class NormalQuack: IQuackBehaviour {
+    public void Quack() {
+        Console.WriteLine("Quack");
+    }
+}
+
+public class MuteQuack : IQuackBehaviour {
+    public void Quack() {
+        Console.WriteLine("<< Silence >>");
+    }
+}
+
+public class Squeak: IQuackBehaviour {
+    public void Quack() {
+        Console.WriteLine("Squeak");
+    }
+}