Refactoring

Slide 1: Refactoring Aman & Chirag ThoughtWorks Pune

Slide 2: If it ain’t broken, why fix it?

Slide 3: Good programmers write code that humans can understand

Slide 4: You write code once; it gets read many times

Slide 5: To regain control on a program that is getting out of hands

Slide 6: To make the next change easier

Slide 7: This brings us to Refactoring

Slide 8: Refactoring in Action

Slide 9: Code Smells

Slide 10: Duplicated Code

Slide 11: Long Method

Slide 12: Comments

Slide 13: Divergent Change

Slide 14: Shotgun Surgery

Slide 15: Feature Envy

Slide 16: Lazy Class

Slide 17: Switch Statements

Slide 18: Primitive Obsession

Slide 19: Method Chains

Slide 20: Refactoring Catalog

Slide 21: Refactoring Catalog Composing methods

Slide 22: Source: refactoring.com

Slide 28: Refactoring Catalog Simplifying Conditional Expressions

Slide 36: Refactoring Catalog Making Method Calls Simpler

Slide 41: Accompanying XP Practices TDD : “Red - Green - Refactor” mantra • Continuous Integration • • Collective Code Ownership • Pair Programming

Slide 42: Next steps for you • Go read the book!!! • Practice small refactorings – Explore the “Refactor” menu of your IDE • Keep a look out for code smells in your project

Slide 43: To sum it up… • Refactoring is a good technique to clean up code • Refactoring leads to better design (especially with Test-Code-Refactor cycles) • Most important of all: it leaves a nice feeling at the end of it all!

Slide 44: Thank You • Aman King – king@thoughtworks.com • Chirag Doshi – chirag@thoughtworks.com

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