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Re:Ask HN: What is the first thing you implement at a new co... by SketchySeaBeast on Wednesday June 20, 2018 @10:20AM (#17355610)
> some testcases of required behavior, and then refactor only code that is supported by tests

The difficulty is making sure that you have all the requirements and aren't missing any, and once a system gets big enough, that gets really difficult.

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