99 Bottles of OOP

My work through 99 Bottles of OOP by
Sandi Metz and Katrina Owen.

In Brief

Write the Shameless Green solution described in the book for 99 Bottles of Beer
using TDD. Then, refactor the code to meet the requirement of outputting
‘1 six-pack’ instead of ‘6 bottles’ in verses seven and six of the song.

To Remember

Flocking Rules

1. Select the things that are most alike.
2. Find the smallest difference between them.
3. Make the simplest change to remove that difference:

• parse the new code
• parse and execute it
• parse, execute and use its result
• delete unused code

As you’re following the rules:

• In general, change only one line at a time.
• Run the tests after every change.
• If you go red, undo and make a better change.

Canons

• Strive for simplicity.
• Don’t abstract too soon.
• Focus on smells.
• Concentrate on difference.
• Take small steps.
• Follow the Flocking Rules.
• Refactor under green.
• Fix the easy problems first.
• Work horizontally.
• Seek stable landing points.
• Be disciplined.
• Don’t chase the shiny thing.
• Deal with new requirements by first refactoring existing code to be open to them,
  and then writing new code to meet them.