Refactoring: Refactorings/Remove Unused Default Parameter

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A parameter has a default value, but all method calls provide a value for the parameter; so we need to remove the default value.

Mechanics

  1. Remove the default parameter in the method signature
  2. Test
  3. Remove any code within the method that checks for the default value
  4. Test


Example

Before

def product_count_items(search_criteria=nil)
  criteria = search criteria | @search_criteria
  ProductCountItem.find_all_by_criteria(criteria)
end

After

def product_count_items(search_criteria)
  ProductCountItem.find_all_by_criteria(search_criteria)
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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