Refactoring JavaScript. Turning Bad Code Into Good Code Evan Burchard

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Spis treści książki

• Foreword
• Preface
  • Why This Book Exists
  • Who This Book Is For
  • How To Use This Book
  • Some Words in This Book
    • App, Application, Program
    • Inclusivity Through Words and Diagrams
    • Users
    • Third-Party Libraries and Communities
    • API, Interface, Implementation, Client Code
    • Inputs (Nonlocal and Free Variables)
  • Conventions Used in This Book
  • Using Code Examples
  • OReilly Safari
  • How to Contact Us
  • Acknowledgments
• 1. What Is Refactoring?
  • How Can You Guarantee Behavior Doesnt Change?
    • Why Dont We Care About Details of Implementation?
    • Why Dont We Care About Unspecified and Untested Behavior?
    • Why Dont We Care About Performance?
  • What Is the Point of Refactoring if Behavior Doesnt Change?
    • Balancing Quality and Getting Things Done
    • What Is Quality and How Does It Relate to Refactoring?
    • Refactoring as Exploration
  • What Is and Isnt Refactoring
  • Wrapping Up
• 2. Which JavaScript Are You Using?
  • Versions and Specifications
  • Platforms and Implementations
  • Precompiled Languages
  • Frameworks
  • Libraries
  • What JavaScript Do You Need?
  • What JavaScript Are We Using?
  • Wrapping Up
• 3. Testing
  • The Many Whys of Testing
  • The Many Ways of Testing
    • Manual Testing
    • Documented Manual Testing
    • Approval Tests
    • End-to-End Tests
    • Unit Tests
    • Nonfunctional Testing
    • Other Test Types of Interest
  • Tools and Processes
    • Processes for Quality
      • Coding standards and style guides
      • Developer happiness meeting
      • Pair programming
      • Code review
      • Test-driven development
    • Tools for Quality
      • Version control
      • Test frameworks
      • Assertion/expectation syntax libraries
      • Domain-specific libraries
      • Factories and fixtures
      • Mocking/stubbing libraries
      • Build/task/packaging tools
      • Loaders and watchers
      • Test run parallelizers
      • Continuous integration (CI) services
      • Coverage reporters
      • Style checkers, aka linters
      • Debuggers/loggers
      • Staging/QA servers
  • Wrapping Up
• 4. Testing in Action
  • New Code from Scratch
  • New Code from Scratch with TDD
  • Untested Code and Characterization Tests
  • Debugging and Regression Tests
  • Wrapping Up
• 5. Basic Refactoring Goals
  • Function Bulk
  • Inputs
  • Outputs
  • Side Effects
  • Context Part 1: The Implicit Input
    • this in Strict Mode
  • Context Part 2: Privacy
    • Is There Privacy in JavaScript?
  • Wrapping Up
• 6. Refactoring Simple Structures
  • The Code
  • Our Strategy for Confidence
  • Renaming Things
  • Useless Code
    • Dead Code
    • Speculative Code and Comments
    • Whitespace
    • Do-Nothing Code
    • Debugging/Logging Statements
  • Variables
    • Magic Numbers
    • Long Lines: Part 1 (Variables)
    • Inlining Function Calls
    • Introducing a Variable
    • Variable Hoisting
  • Strings
    • Concatenating, Magic, and Template Strings
    • Regex Basics for Handling Strings
    • Long Lines: Part 2 (Strings)
      • Solution 1
      • Solution 2
      • Solution 3
      • Solution 4
  • Working with Arrays: Loops, forEach, map
    • Long Lines: Part 3 (Arrays)
    • Which Loop to Choose?
    • Better Than Loops
  • Wrapping Up
• 7. Refactoring Functions and Objects
  • The Code (Improved)
  • Array and Object Alternatives
    • Array Alternative: Sets
    • Array Alternative: Objects
    • Object Alternative: Maps
    • Array Alternative: Bit Fields
  • Testing What We Have
    • Our Setup Test
    • Characterization Tests for classify
    • Testing the welcomeMessage
    • Testing for labelProbabilities
  • Extracting Functions
    • Getting Away from Procedural Code
    • Extracting and Naming Anonymous Functions
    • Function Calls and Function Literals
  • Streamlining the API with One Global Object
    • Extracting the classifier Object  
    • Inlining the setup Function
    • Extracting the songList Object
    • Handling the Remaining Global Variables
    • Making Data Independent from the Program
    • Scoping Declarations: var, let, and const
    • Bringing classify into the classifier
    • Untangling Coupled Values
    • Objects with Duplicate Information
    • Bringing the Other Functions and Variables into classifier
    • Shorthand Syntax: Arrow, Object Function, and Object
    • Getting New Objects with Constructor Functions
    • Constructor Functions Versus Factory Functions
    • A class for Our Classifier
    • Choosing Our API
    • Time for a Little Privacy?
    • Adapting the Classifier to a New Problem Domain
  • Wrapping Up
• 8. Refactoring Within a Hierarchy
  • About CRUD Apps and Frameworks
  • Lets Build a Hierarchy
  • Lets Wreck Our Hierarchy
    • Constructor Functions
    • Object Literals
    • Factory Functions
    • Evaluating Your Options for Hierarchies
  • Inheritance and Architecture
    • Why Do Some People Hate Classes?
    • What About Multiple Inheritance?
    • Which Interfaces Do You Want?
  • Has-A Relationships
  • Inheritance Antipatterns
    • Hyperextension
    • Goat and Cabbage Raised by a Wolf
  • Wrapping Up
• 9. Refactoring to OOP Patterns
  • Template Method
    • A Functional Variant
  • Strategy
  • State
  • null Object
  • Wrapper (Decorator and Adapter)
  • Facade
  • Wrapping Up
• 10. Asynchronous Refactoring
  • Why Async?
  • Fixing the Pyramid of Doom
    • Extracting Functions into a Containing Object
    • Testing Our Asynchronous Program
    • Additional Testing Considerations
  • Callbacks and Testing
    • Basic CPS and IoC
    • Callback Style Testing
  • Promises
    • The Basic Promise Interface
    • Creating and Using Promises
    • Testing Promises
  • Wrapping Up
• 11. Functional Refactoring
  • The Restrictions and Benefits of Functional Programming
    • Restrictions
    • Benefits
    • The Future (Maybe) of Functional Programming
  • The Basics
    • Avoiding Destructive Actions, Mutation, and Reassignment
      • Avoiding reassignment in conditional tests
      • Avoiding reassignment in loops
      • Avoiding reassignment in conditional bodies
      • Avoiding destructive functions
      • Avoiding destruction in general
    • Dont return null
    • Referential Transparency and Avoiding State
    • Handling Randomness
    • Keeping the Impure at Bay
  • Advanced Basics
    • Currying and Partial Application (with Ramda)
    • Function Composition
    • Types: The Bare Minimum
      • The case for types
      • Less intuitive aspects of types
  • Burritos
    • Introducing Sanctuary
    • The null Object Pattern, Revisited!
    • Functional Refactoring with Maybe
    • Functional Refactoring with Either
  • Learning and Using Burritos
  • Moving from OOP to FP
    • Return of the Naive Bayes Classifier
    • Rewrites
  • Wrapping Up
• 12. Conclusion
• A. Further Reading and Resources
  • Origins of Refactoring
  • Baseline JavaScript(s)
  • Keeping Up with JavaScript
  • JavaScript Reference
  • Object-Oriented Programs/Patterns (Including Anticlass Stances)
  • Async
  • Functional
  • Tools
  • Non-JS-Specific but Relevant Sources
  • Me
• Index

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