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When are you done writing a piece of code? Is it when you have implemented the necessary functionality? When you have tested it? I believe there is more to professional-quality code than just getting it to function properly. What else is there? Making sure the code is maintainable - well designed and understandable. I use the term polishing code to refer to this kind of work that is done on a code base after it is functioning properly. I like the analogy with woodworking: once a piece is assembled and finished, the final step is to polish the surface to make it shine.