Function Keys

This book describes the four essential keys to unlock the secret of software design. The four keys are:

• A function name should tell a story
  
• A function should be easy to read and understand
  
• A function should be easy to maintain
  
• A function should be easy to test
  

This book is for you if you want to:

• properly evaluate your app to find classes and functions to improve.
  
• understand why your current code needs to be refactored.
  
• refactor your code into small pieces of unit-testable classes and functions
  
• find an architecture agnostic approach to writing good code.
  
• go outside Clean Swift’s VIP cycle and design your own workers and custom views.
  
• come up with good test cases to fully cover all code paths.
  
• write non-fragile and maintainable unit tests.
  
• make sure you’re doing the right thing before you start refactoring.
  
• avoid having to refactor after refactor, again and again.