Refactoring In The Loop

Reference

Every refactoring, smell, and pattern in the catalog, grouped by its source book. 66 refactorings · 24 smells · 27 Kerievsky refactorings · 23 GoF design patterns.

Refactorings

Martin Fowler, Refactoring (2nd ed., 2018) — organized by chapter.

Basic Refactorings

Rename Variable

Remove Dead Code

Replace Magic Literal

Encapsulation

Encapsulate Variable

Remove Middle Man

Encapsulate Collection

Encapsulate Record

Remove Setting Method

Moving Features

Organizing Data

Replace Primitive with Object

Change Reference to Value

Change Value to Reference

Simplifying Conditional Logic

Decompose Conditional

Consolidate Conditional Expression

Replace Nested Conditional with Guard Clauses

Replace Conditional with Polymorphism

Introduce Special Case

Replace Control Flag with Break

Refactoring APIs

Change Function Declaration

Introduce Parameter Object

Introduce Assertion

Separate Query from Modifier

Parameterize Function

Remove Flag Argument

Preserve Whole Object

Replace Parameter with Query

Replace Query with Parameter

Replace Constructor with Factory Function

Replace Error Code with Exception

Replace Exception with Precheck

Dealing with Inheritance

Push Down Method

Replace Type Code with Subclasses

Extract Superclass

Collapse Hierarchy

Replace Subclass with Delegate

Pull Up Constructor Body

Push Down Field

Remove Subclass

Replace Superclass with Delegate

Code smells

Martin Fowler, Refactoring (2nd ed., 2018) — the 24 named smells that trigger a refactoring.

Refactoring to Patterns

Joshua Kerievsky, Refactoring to Patterns (2004) — composite refactorings that lead to a design-pattern destination.

Design Patterns

Gamma, Helm, Johnson, Vlissides, Design Patterns (1994) — the 23 Gang of Four patterns, grouped by intent.

Creational

Abstract Factory

Structural

Facade Flyweight Proxy

Behavioral

Chain of Responsibility

Iterator Mediator Memento

Template Method