Refactoring (Part 1)

• Replace Temp with Query
  Extract the expression into a method. Replace all reference to the temp with the new method. The new method can then be used in other methods.
• Introduce Explaining Variable
  Put the result of the expression, or parts of the expression, in a temporary variable with a name that explains the purpose.
• Split Temporary Variable
  Do not reuse the same temp variable, make a separate temporary variable for each assignment.
• Remove Assignments to Parameters
  Function arguments should not be re-assigned inside the function.
• Replace Method with Method Object
  Turn the method into its own object so that all the local variables become fields on that object. You can then decompose the method into other methods on the same object.
• Substitute Algorithm
  Replace the body of the method with some new algorithm.