Refactoring and code smells

•

2 likes•709 views

Halima Koundi

Slides of the talk I gave at SwanseaCon 2016 (swanseacon.co.uk)

Software

Code Smells
“A code smell is a surface indication that usually
corresponds to a deeper problem in the system.”
M. Fowler

Code Smells
The Bloaters
Data Clumps
Primitive Obsession
Long Methods
Large Classes
Long Parameters List

Code Smells
Object Orientation
abusers
Temporary Fields
Switch Statement
Refused Bequest
Alternative Classes with
Different interfaces

Code Smells
Change Preventers
Parallel Inheritance
Hierarchies
Divergent Change
Shotgun Surgery

Code Smells
The Couplers
Feature Envy
Inappropriate Intimacy
Message Chains
Middle Man

Code Smells
The Dispensables
Comments
Dead Code
Duplicate Code
Data Class
Lazy Class
Speculative Generality

Refactoring
Demo
We are going to see how to
- Deal with long parameters list
- Split long methods
- Refactor a switch statement

Refactoring
Why should you
care?
When and when
not?
Two main reasons:
- Decrease the cost of change
- Make the code easier to
understand
When to refactor?
- TDD: Red, Green, Refactor
- To make room for change
- When you fix a bug
- As you do a code review

Resources:
➔ Code smells blog post by Ana Nogal
➔ Complex refactoring in simple steps Screencast by
Matthew Butt

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Refactoring and code smells

1. Refactoring & Code Smells A step by step journey towards cleaner code Halima Koundi Software Craftsman Apprentice @hkoundi | halima@codurance.com

2. Code Smells “A code smell is a surface indication that usually corresponds to a deeper problem in the system.” M. Fowler

3. Code Smells The Bloaters Data Clumps Primitive Obsession Long Methods Large Classes Long Parameters List

4. Code Smells Object Orientation abusers Temporary Fields Switch Statement Refused Bequest Alternative Classes with Different interfaces

5. Code Smells Change Preventers Parallel Inheritance Hierarchies Divergent Change Shotgun Surgery

6. Code Smells The Couplers Feature Envy Inappropriate Intimacy Message Chains Middle Man

7. Code Smells The Dispensables Comments Dead Code Duplicate Code Data Class Lazy Class Speculative Generality

8. Refactoring Demo We are going to see how to - Deal with long parameters list - Split long methods - Refactor a switch statement

9. Refactoring Why should you care? When and when not? Two main reasons: - Decrease the cost of change - Make the code easier to understand When to refactor? - TDD: Red, Green, Refactor - To make room for change - When you fix a bug - As you do a code review

10. Resources: ➔ Code smells blog post by Ana Nogal ➔ Complex refactoring in simple steps Screencast by Matthew Butt

11. Thank you @hkoundi

Refactoring and code smells

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