Clean Code

Recommended Books

• Working Efficiently With Legacy Code
• User Stories Applied For Agile Software Development by Mike Cohn

SOLID principle

• Single responsibility principle
  • a class should have only a single responsibility (i.e. changes to only one part of the software’s specification should be able to affect the specification of the class)
• Open/closed principle
  • software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification
• Liskov substitution principle
  • objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program.
  • See also design by contract
• Interface segregation principle
• Dependency inversion principle

SOLID

Three laws of TDD:

1. Write failing test first
2. Write only enough test to fail
3. Write only enough code to pass

If the test gets more specific, the code gets more generic.

Transformation List

• Null
• Null to constant
• Constant to variable
• Add computation
• Split flow
• Variable to array
• Array to container
• If to while
• Recurse
• Iterate
• Assign
• Add case