Refactoring Fundamentals

By Steve Smith
Refactoring is a critical developer skill that helps keep code from collapsing under its own weight. This course covers when and how to refactor code, as well as a wide variety of "code smells" that may indicate some refactoring is warranted. The course concludes with a refactoring kata that students can perform on their own to practice their refactoring skills.
Course info
Level
Intermediate
Updated
Dec 13, 2013
Duration
8h 1m
Table of contents
Introducing Refactoring
Introduction 2m What is Refactoring? 4m Why Should You Refactor? 2m Technical Debt 2m When Should You Refactor 5m Refactoring Principles 2m The Refactoring Process 2m Demo: Characterization Tests 3m Refactoring Tips 1m Refactoring Tools 2m Premature Optimization 1m Refactoring and Tests 1m Demo: A Simple Refactoring 3m Summary 1m
Bloating Code Smells
Introduction 1m Code Smells 2m Principle of Least Surprise 1m Organizing Code Smells 1m The Bloaters 1m Long Method 4m Long Method Examples 19m Primitive Obsession 6m Long Parameter List 7m Data Clumps 2m Combinatorial Explosion 2m Oddball Solution 1m Class Doesn't Do Much 0m Required Setup/Teardown Code 1m Summary 1m
Obfuscating Code Smells
Introduction 1m The Obfuscators 1m Regions 5m Comments 8m Poor Names 9m Vertical Separation 1m Inconsistency 1m Obscured Intent 1m Summary 1m
Object Orientation Abuser Code Smells
Introduction 1m Switch Statements 5m Temporary Field 4m Alternative Classes with Different Interfaces 2m Class Depends on Subclass 4m Inappropriate Static 1m Summary 2m
Code Smells: Change Preventer
Introduction 1m Change Preventers 1m Divergent Change 1m Shotgun Surgery 1m Parallel Inheritance Hierarchies 2m Inconsistent Abstraction Levels 2m Conditional Complexity 6m Poorly Written Tests 1m Summary 1m
Code Smells: Dispensables
Introduction 1m The Dispensables 0m Lazy Class 1m Data Class 3m Duplicate Code 2m Dead Code 2m Speculative Generality 2m Summary 1m
Code Smells: The Couplers
Introduction 1m The Couplers 1m Feature Envy 4m Inappropriate Intimacy 2m Law of Demeter 4m Indecent Exposure 1m Message Chains 1m Middle Man 1m Tramp Data 1m Artificial Coupling 1m Hidden Temporal Coupling 3m Hidden Dependencies 5m Summary 2m
Environment and Testing Code Smells
Introduction 1m Environment Smells 8m Test Smells 2m Not Enough Tests 2m DRY vs. DAMP 2m Fragility 16m The Liar 1m Excessive Setup 1m The Giant 1m The Mockery 1m The Inspector 1m Generous Leftovers 2m The Local Hero 1m The Nitpicker 1m The Secret Catcher 1m The Loudmouth 1m The Greedy Catcher 1m The Sequencer 0m The Hidden Dependency 1m The Enumerator 1m The Stranger 1m The OS Evangelist 1m Success Against All Odds 1m The Free Ride 1m The One 1m The Peeping Tom 1m The Slow Poke 1m The Contradiction 1m Roll the Dice 6m Hidden Tests 2m Second Class Citizens 1m Wait and See 2m Inappropriate Test Group 1m The Optimist 1m The Sleeper 1m The Void 0m Summary 1m
Method Refactorings
Introduction 1m Extract Method 2m Rename Method 3m Demo: Extract and Rename Method 5m Inline Method 2m Introduce Explaining Variable 2m Inline Temp 1m Replace Temp with Query 1m Demo: Replace Temp with Query 3m Split Temporary Variable 2m Parameterize Method 1m Replace Parameter with Explicit Methods 2m Add Parameter 1m Remove Parameter 3m Separate Query from Modifier 4m Summary 1m
More Method Refactorings
Introduction 1m Preserve Whole Object 3m Replace Parameter with Method 2m Introduce Parameter Object 2m Remove Setting Method 2m Hide Method 1m Replace Constructor with Factory Method 3m Replace Error Code with Exception 3m Remove Assignments to Parameters 1m Replace Exception with Test 2m Replace Method with Method Object 5m Compose Method 3m Substitute Algorithm 3m Summary 1m
Class and Object Refactorings
Introduction 1m Encapsulate Field 2m Encapsulate Collection 3m Move Field 2m Move Method 5m Extract Class 3m Inline Class 2m Extract Interface 2m Extract Subclass 3m Extract Superclass 4m Hide Delegate 2m Remove Middle Man 2m Summary 1m
Class Hierarchy Refactorings
Introduction 1m Pull Up Field 2m Push Down Field 2m Pull Up Method 3m Push Down Method 2m Collapse Hierarchy 3m Replace Inheritance with Delegation 4m Replace Delegation with Inheritance 3m Replace Type Code with Class 5m Replace Type Code with Subclasses 3m Replace Conditional with Polymorphism 4m Summary 1m
Pattern-Based Refactorings
Introduction 1m Encapsulate Classes with Factory 4m Form Template Method 5m Introduce Null Object 5m Move Accumulation to Visitor 8m Move Embellishment to Decorator 7m Replace Conditional Dispatcher with Command 6m Replace Conditional Logic with Strategy 6m Replace State-Altering Conditionals with State 8m Replace Type Code with State (or Strategy) 4m Unify Interfaces with Adapter 8m Summary 1m
Gilded Rose Kata
Introduction 4m Gilded Rose Kata Setup 2m Beginning the Kata 3m Adding First Tests 8m Testing Aged Brie 3m Testing Sulfuras 1m Testing Backstage Passes 3m Refactoring with StoreItem 7m Testing Individual Strategies 6m Adding Conjured Item Support 8m Summary 2m
Description
Course info
Level
Intermediate
Updated
Dec 13, 2013
Duration
8h 1m
Description

Refactoring is a critical developer skill that helps keep code from collapsing under its own weight. Learn how to recognize "code smells" that may indicate the need for refactoring, the refactoring process, and when and how to apply specific refactorings to your code.

About the author
Steve Smith
About the author

Steve Smith (@ardalis) is an entrepreneur and software developer with a passion for building quality software as effectively as possible.

More from the author
Refactoring for C# Developers
Intermediate
2h 18m
Aug 22, 2019
SOLID Principles for C# Developers
Beginner
2h 9m
Apr 2, 2019
Microsoft Azure Developer: Refactoring Code
Beginner
1h 51m
Sep 18, 2018
More courses by Steve Smith

You're the smartest person in the room

PROVE IT

Your team won't just close the skills gap

THEY'LL HURDLE IT