static void Main(string[] args)
{
// Somewhere in the client code.
var shapes = new List <Shape>();
var circle = new Circle(10, 10, "Red");
circle.Radius = 20;
shapes.Add(circle);
var anotherCircle = circle.Clone();
// The `anotherCircle` variable contains an exact copy
// of the `circle` object.
shapes.Add(anotherCircle);
var rectangle = new Rectangle(20, 20, "Blue");
shapes.Add(rectangle);
var shapesCopy = new List <Shape>();
// Prototype lets you produce a copy of
// an object without knowing anything about its type.
// For instance, we don't know the exact elements in the
// shapes array. All we know is that they are all
// shapes. But thanks to polymorphism, when we call the
// `Clone` method on a shape the program checks its real
// class and runs the appropriate clone method defined
// in that class. That's why we get proper clones
// instead of a set of simple Shape objects.
foreach (var shape in shapes)
{
shapesCopy.Add(shape.Clone());
}
// The `shapesCopy` array contains exact copies of the
// `shape` array's children, but they are entirely different objects.
var circleOne = shapes[0];
var circleTwo = shapes[1];
var rectangleOne = shapes[2];
var copyOfCircleOne = shapesCopy[0];
var copyOfCircleTwo = shapesCopy[1];
var copyOfRectangleOne = shapesCopy[2];
Console.WriteLine("- circleOne / copyOfCircleOne - ");
Console.WriteLine($"X values ({circleOne.X}) are equal: {circleOne.X == copyOfCircleOne.X}");
Console.WriteLine($"Y values ({circleOne.Y}) are equal: {circleOne.Y == copyOfCircleOne.Y}");
Console.WriteLine($"Color values ({circleOne.Color}) are equal: {circleOne.Color == copyOfCircleOne.Color}");
Console.WriteLine($"circleOne is same object with copyOfCircleOne: {circleOne == copyOfCircleOne}");
Console.WriteLine("- circleTwo / copyOfCircleTwo - ");
Console.WriteLine($"X values ({circleTwo.X}) are equal: {circleTwo.X == copyOfCircleTwo.X}");
Console.WriteLine($"Y values ({circleTwo.Y}) are equal: {circleTwo.Y == copyOfCircleTwo.Y}");
Console.WriteLine($"Color values ({circleTwo.Color}) are equal: {circleTwo.Color == copyOfCircleTwo.Color}");
Console.WriteLine($"circleTwo is same object with copyOfCircleTwo: {circleTwo == copyOfCircleTwo}");
Console.WriteLine("- rectangleOne / copyOfRectangleOne - ");
Console.WriteLine($"X values ({rectangleOne.X}) are equal: {rectangleOne.X == copyOfRectangleOne.X}");
Console.WriteLine($"Y values ({rectangleOne.Y}) are equal: {rectangleOne.Y == copyOfRectangleOne.Y}");
Console.WriteLine($"Color values ({rectangleOne.Color}) are equal: {rectangleOne.Color == copyOfRectangleOne.Color}");
Console.WriteLine($"rectangleOne is same object with copyOfRectangleOne: {rectangleOne == copyOfRectangleOne}");
Console.ReadLine();
}