Added item for page 244

vscode/Chapter05/PacktLibraryModern/Records.cs

@@ -0,0 +1,18 @@
+namespace Packt.Shared;
+
+public class ImmutablePerson
+{
+  public string? FirstName { get; init; }
+  public string? LastName { get; init; }
+}
+
+public record ImmutableVehicle
+{
+  public int Wheels { get; init; }
+  public string? Color { get; init; }
+  public string? Brand { get; init; }
+}
+
+// simpler way to define a record
+// auto-generates the properties, constructor, and deconstructor
+public record ImmutableAnimal(string Name, string Species);

vscode/Chapter05/PacktLibraryNetStandard2/Records.cs

@@ -1,7 +0,0 @@
-namespace Packt.Shared;
-
-public class ImmutablePerson
-{
-  //public string? FirstName { get; init; }
-  //public string? LastName { get; init; }
-}

vscode/Chapter05/PeopleApp/Program.cs

@@ -293,9 +293,28 @@ foreach (Passenger passenger in passengers)
   WriteLine($"Flight costs {flightCost:C} for {passenger}");
 }
 
-//ImmutablePerson jeff = new()
-//{
-//  FirstName = "Jeff",
-//  LastName = "Winger"
-//};
-//jeff.FirstName = "Geoff";
+ImmutablePerson jeff = new()
+{
+  FirstName = "Jeff",
+  LastName = "Winger"
+};
+// We cannot set the properties after initialization because they
+// are init-only.
+// jeff.FirstName = "Geoff";
+
+ImmutableVehicle car = new()
+{
+  Brand = "Mazda MX-5 RF",
+  Color = "Soul Red Crystal Metallic",
+  Wheels = 4
+};
+
+ImmutableVehicle repaintedCar = car
+  with { Color = "Polymetal Grey Metallic" };
+
+WriteLine($"Original car color was {car.Color}.");
+WriteLine($"New car color is {repaintedCar.Color}.");
+
+ImmutableAnimal oscar = new("Oscar", "Labrador");
+var (who, what) = oscar; // calls Deconstruct method 
+WriteLine($"{who} is a {what}.");