Refactoring
Course

SECTION 1: FOUNDATIONSECTION 1: FOUNDATION

• What is Refactoring?
• Why should we refactor?
• When should we refactor?
• When should we not refactor?
• Problems with Refactoring
• The Two Hats
• Parallel change
• Automated Refactorings

SECTION 2: PRINCIPLESSECTION 2: PRINCIPLES

• Separation of Concerns
• Maintainability & Readability over Brevity
• Incremental Change
• Safety-Driven

SECTION 3: CODE SMELLSSECTION 3: CODE SMELLS

• Mysterious Name
• Duplicated Code
• Long Function
• Long Parameter List
• Global Data
• Mutable Data
• Feature Envy
• Primitive Obsession
• Loops
• Message Chains

SECTION 4: REFACTORING TECHNIQUESSECTION 4: REFACTORING TECHNIQUES

• Extract Method, Extract Variable
• Introduce Parameter Object
• Preserve Whole Object
• Split Phase
• Replace Parameter with Query
• Replace Temp with Query
• Slide Statement
• Replace Nested Conditional with Guard Clauses
• Replace Conditionals with Polymorphism
• Introduce Assertion
• Separate Query from Modifier

SECTION 5: BUILDING TESTSSECTION 5: BUILDING TESTS

• Why Do We Write Tests?
• Testing Frameworks Capabilities
• Test Behavior, Not Implementation
• Common Test Smells

SECTION 6: PRACTICING [CODING KATAS]SECTION 6: PRACTICING [CODING KATAS]