Clean Code

Functions should be small, less than 20 lines

Do ONE thing, can be explained in a single sentence. Only need to change for ONE reason.

• implementation of function is ONE level of abstraction below the name
• can it call another function? If so, it is not doing ONE thing.

Code should read from top to bottom

• Method 1
  • Method 1.1
  • Method 1.2
• Method 2
  • Method 2.1
  • Method 2.2

Number of arguments

• pref 0, 1, 2, 3 (avoid), > 3 (require special justification)

Law of Demeter

• object should only touch neighboring objects
• train wreck

Many small classes (Single Responsibility Principle)