Martin Fowler on refactoring

http://martinfowler.com/bliki/OpportunisticRefactoring.html

“There is a genuine danger of going down a rabbit hole here, as you fix one thing you spot another, and another, and before long you’re deep in yak hair. Skillful opportunistic refactoring requires good judgement, where you decide when to call it a day. You want to leave the code better than you found it, but it can also wait for another visit to make it the way you’d really like to see it. If you always make things a little better, then repeated applications will make a big impact that’s focused on the areas that are frequently visited – which are exactly the areas where clean code is most valuable. Like most aspects of programming this decision requires thoughtfulness.”

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