Create 3_LSP_code_refactor.md

Author: bradvin

3_LSP_code_refactor.md

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+> 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!
+    }
+
+[&laquo; back to readme.md](README.md)