3_LSP_code_refactor.md

Based on the problem with Ostriches trying to fly, we should consider removing Fly from our base Bird class

class Bird { }

class FlyingBird {
  void Fly() { return "fly"; }
}

class Dove : FlyingBird {
  void Fly() { return "flap"; }
}
class Eagle : FlyingBird {
  void Fly() { return "soar"; }
}
class Ostrich : Bird { }

Now we can make all flying birds, fly:

this.flyingBirds = new List<FlyingBird>();
this.flyingBirds.Add(new Dove());
this.flyingBirds.Add(new Eagle());

foreach(var flyingBird in this.flyingBirds) {
  flyingBird.Fly(); //success!
}

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