Refactoring: Refactorings/Inline Method

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Method's content is just as clear (and as short) as its name. Useful before Replace Method with Method Object

Mechanics

  1. Check that method is not polymorphic (overridden in subclass)
    Note: Don't inline if subclasses override the method; they cannot override a method that isn't there.
  2. Find all calls to the method
  3. Replace each call with the method body.
  4. Test
  5. Remove method definition

Example

Before

def get_rating
  more_than_five_late_deliveries ? 2 : 1
end

def more_than_five_late_deliveries
  @number_of_late_deliveries > 5
end

After

def get_rating
  @number_of_late_deliveries > 5 ? 2 : 1
end
Refactorings
Composing Methods

Extract Method • Inline Method • Inline Temp • Replace Temp with Query • Replace Temp with Chain • Introduce Explaining Variable • Split Temporary Variable • Remove Assignments to Parameters • Replace Method with Method Object • Substitute Algorithm • Replace Loop with Collection Closure Method • Extract Surrounding Method • Introduce Class Annotation • Introduce Named Parameter • Remove Named Parameter • Remove Unused Default Parameter • Dynamic Method Definition • Replace Dynamic Receptor with Dynamic Method Definition • Isolate Dynamic Receptor • Move Eval from Runtime to Parse Time

Moving Features Between Objects

Move Method • Move Field • Extract Class • Inline Class • Hide Delegate • Remove Middle Man

Organizing Data

Self Encapsulate Field • Replace Data Value with Object • Change Value to Reference • Change Reference to Value • Replace Array with Object • Replace Hash with Object • Change Unidirectional Association to Bidirectional • Change Bidirectional Association to Unidirectional • Replace Magic Number with Symbolic Content • Encapsulate Collection • Replace Record with Data Class • Replace Type Code with Polymorphism • Replace Type Code with Module Extension • Replace Type Code with State-Strategy • Replace Subclass with Fields • Lazily Initialized Atribute • Eagerly Initialized Attribute

Simplifying Conditional Expressions

Decompose Conditional • Recompose Conditional • Consolidate Conditional Expression • Consolidate Duplicate Conditional Fragments • Remove Control Flag • Replace Nested Conditional with Guard Clauses • Replace Conditional with Polymorphism • Introduce Null Object • Introduce Assertion

Making Method Calls Simpler

Rename Method • Add Parameter • Remove Parameter • Separate Query from Modifier • Parameterize Method • Replace Parameter with Explicit Methods • Preserve Whole Object • Replace Parameter with Method • Introduce Parameter Object • Remove Setting Method • Hide Method • Replace Constructor with Factory Method • Replace Error Code with Exception • Replace Exception with Test • Introduce Gateway • Introduce Expression Builder

Dealing with Generalization

Pull Up Method • Push Down Method • Extract Module • Inline Module • Extract Subclass • Introduce Inheritance • Collapse Hierarchy • Form Template Method • Replace Inheritance with Delegation • Replace Delegation with Hierarchy • Replace Abstract Superclass with Module

Big Refactorings

Tease Apart Inheritance • Convert Procedural Design to Objects • Separate Domain from Presentation • Extract Hierarchy

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