Refactoring Like a Pro

What is refactoring?

• A change made to the internal structure of software to make it:
  • Easier to understand.
  • Cheaper to make future changes.
• This does not change the observable behavior of the software.
• Tests help ensure that we didn't change behavior.

Why do we refactor?

• Software left alone will decay.
• Makes it cheaper to make changes.
• Make it easier to understand.
• Improves the design of the code.

Common refactoring techniques:

1. Change names to communicate intent
2. No magic numbers / variables
3. One responsibility per function / class
4. Do not be obsessed with primitives