The rule of 3 is awful because it focuses on the wrong thing. If two instances of the same logic represent the same concept, they should be shared. If 10 instances of the same logic represent unrelated concepts, they should be duplicated.
The goal is to have code that corresponds to a coherent conceptual model for whatever you are doing, and the resulting codebase should clearly reflect the design of the system. Once I started thinking about code in these terms, I realized that questions like "DRY vs YAGNI" were not meaningful.
The goal is to have code that corresponds to a coherent conceptual model for whatever you are doing, and the resulting codebase should clearly reflect the design of the system. Once I started thinking about code in these terms, I realized that questions like "DRY vs YAGNI" were not meaningful.