Ruby Science by thoughtbot -- Read -- Imperial Library of Trantor

Index

Ruby Science Ruby Science Introduction

Code Reviews Follow Your Nose Removing Resistance Bugs and Churn Metrics How To Read This Book

Long Method

Symptoms Example Solutions

Large Class

Symptoms Example Solutions Prevention God Class

Feature Envy

Symptoms Example Solutions

Case Statement

Symptoms Type Codes

Example Solutions

Shotgun Surgery

Symptoms Example Solutions

Divergent Change

Symptoms Example Solutions Prevention

Long Parameter List

Symptoms Example Solutions

Duplicated Code

Symptoms Example Solutions

Uncommunicative Name

Symptoms Example Solutions

Single Table Inheritance (STI)

Symptoms Example Solutions Prevention

Comments

Symptoms Example Solutions

Mixin

Symptoms Example Solutions Prevention

Callback

Symptoms Example Solutions

Replace Conditional with Polymorphism

Uses Example Replace Type Code With Subclasses Single Table Inheritance (STI)

Extracting Type-Specific Code

Polymorphic Partials

Multiple Polymorphic Views Drawbacks Next Steps

Replace conditional with Null Object

Uses Example Drawbacks Next Steps truthiness, try, and other tricks

Extract method

Uses Example Replace temp with query

Other Examples Next Steps

Rename Method

Uses Example Next Steps

Extract Class

Uses Example Drawbacks Next Steps

Extract Value Object

Uses Example Next Steps

Extract Decorator

Uses Example Drawbacks Next Steps

Extract Partial

Uses Steps Example Next Steps

Extract Validator

Uses Example Next Steps

Introduce Explaining Variable

Uses Example Next Steps

Introduce Form Object

Uses Example Next Steps

Introduce Parameter Object

Uses Example Next Steps

Introduce Facade Use class as Factory

Uses Example Next Steps

Move method

Uses Dangerous: move and extract at the same time Next Steps

Inline class

Uses Example Drawbacks Next Steps

Inject dependencies

Uses Example Drawbacks Next Steps

Replace Subclasses with Strategies

Uses Example Drawbacks Next Steps

Replace mixin with composition

Uses Example Next Steps

Replace Callback with Method

Uses Steps Example Next Steps

Use convention over configuration

Uses Example Scoping constantize

Drawbacks

DRY

Duplicated Knowledge vs Duplicated Text

Application

Single responsibility principle

Reasons to change Stability Cohesion Responsibility Magnets Tension with Tell, Don't Ask

Drawbacks Application

Tell, Don't Ask

Encapsulation of Logic Encapsulation of State Minimal Public Interface Tension with MVC

Application

Law of Demeter

Multiple Dots Multiple Assignments The Spirit of the Law Objects vs Types Duplication

Application

Composition over inheritance

Inheritance Composition Dynamic vs Static Dynamic Inheritance The trouble With Hierarchies Mixins Single Table Inheritance

Drawbacks Application

Open/closed principle

Strategies

Inheritance Decorators Dependency Injection

Everything is Open Monkey Patching

Drawbacks Application

Dependency inversion principle

Inversion of Control Where To Decide Dependencies

Drawbacks Application

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