Comment by reedlaw

I had a similar reaction to Jeffries' Gilded Rose solution in Ruby [1]. After 13 blog posts he ended up with something [2] a lot less elegant than Victor Shepelev who also used TDD but came up with a one-shot solution [3]. Just like Norvig with his Sudoku solver, Shepelev codifies the rules as a set of relationships. He writes:

  When rereading the requirements, we might notice that all conditions can be described as a simple dependency (name, sell_in) => change of quality.

  The most natural representation of this in the modern Ruby would be pattern matching.

1. https://ronjeffries.com/articles/020-01ff/gilded-rose-1/

2. https://github.com/RonJeffries/gold-1/blob/master/wrappers.r...

3. https://zverok.substack.com/i/149071314/the-implementation