ruby list

Table of Contents

Introduction

Code Smells

Long Method
Large Class
Feature Envy
Case Statement
High Fan-out
Shotgun Surgery
Divergent Change
Long Parameter List
Duplicated Code
Uncommunicative Name
Single Table Inheritance (STI)
Parallel Inheritance Hierarchies*
Comments
Mixin
Callback
Solutions

Replace Conditional with Polymorphism
Replace conditional with Null Object
Extract method
Rename Method
Extract Class
Extract Value Object
Extract Decorator
Extract Partial
Extract Validator
Introduce Explaining Variable
Introduce Observer
Introduce Form Object
Introduce Parameter Object
Use class as Factory
Move method
Inline class
Inject dependencies
Replace Subclasses with Strategies
Replace mixin with composition
Replace Callback with Method
Use convention over configuration
Introduce Visitor
Principles

DRY
Single responsibility principle
Tell, Don’t Ask
Law of Demeter
Composition over inheritance
Open/closed principle
Dependency inversion principle