Interlude 2. Inverses

When we refactor, we're trying to respond to the forces affecting code. Sometimes what was a good change today no longer looks so good tomorrow, and we find ourselves reversing a refactoring.

Interlude I2.1

Table I-3 presents a list of refactorings. Next to each refactoring, write the name of the refactoring that undoes its effects. (The refactoring and its inverse will both be on the list.)

See Appendix C for solution.

Table I.3. Refactorings and Their Inverses

REFACTORING	INVERSE
Add Parameter
Change Bidirectional Association to Unidirectional
Change Reference to Value
Change Unidirectional Association to Bidirectional
Change Value to Reference
Collapse Hierarchy
Extract Class
Extract Method
Extract Subclass
Hide Delegate
Inline Class
Inline Method
Inline Temp
Introduce Explaining Variable
Move Field
Move Method
Parameterize Method
Pull Up Field
Pull Up Method
Push Down Field
Push Down Method
Remove Middle Man
Remove Parameter
Rename Method
Replace Delegation with Inheritance
Replace Inheritance with Delegation
Replace Parameter with Explicit Methods
Substitute Algorithm