The document discusses refactoring code examples to improve readability and maintainability. It provides examples of switch statements, conditional logic, and suggests replacing switches with polymorphism. The last code example is identified as having complex conditional logic that could be simplified.

1. Refactoring Workshop

2. Consider a Simple Switch public bool EvaluateTestRun (TestStatus status) { switch (status) { case TestStatus.Pass: return true; case TestStatus.Fail: return false; case TestStatus.Irrelevent: return true; } return false; } Are all swtich statements bad? What makes this bad? What makes this acceptable?

3. Consider a More Complex Switch public double CalculateStateSalesTax(decimal value, string state) { double returnValue = 0; switch (state) { case "Alabama": {returnValue = 4; break;} case "Alaska": {returnValue = 0; break;} case "Wyoming": {returnValue = 4; break;} } return returnValue; } What’s wrong here? How can this be improved?

4. Switch Replaced with Polymorphism public interface IState { double SalesTax { get;} } public interface IState { double SalesTax { get;} } public double RefactoredCalculateStateSalesTax(decimal value, string state) { IState stateObject = CreateState(state); return stateObject.SalesTax; }

5. Is This a Problem? if(UserAllowed == true) { User.Allowed = true; } else { User.Allowed = false; }

6. What about this? public void SendReminder() { StringBuilder message = new StringBuilder (); if (Data.ReminderDate == DateTime.Today) { if (Data.ShipDate > Data.OrderDate.AddDays(5)) { message.Append("Sorry last order was late."); message.Append("Next order will be ontime"); WriteMessage (message.ToString ()); } else { message.Append("Time to renew your subscription"; WriteMessage(message.ToString()); } } }

7. Do You See the Difference? public void SendReminder() { StringBuilder message = new StringBuilder (); if (Data.ReminderDate == DateTime.Today) { if (Data.ShipDate > Data.OrderDate.AddDays(5)) { message.Append("Sorry last order was late."); message.Append("Next order will be ontime"); } else { message.Append("Time to renew your subscription"; WriteMessage(message.ToString()); } } }

8. Complex Conditional