Anytime you find yourself in this pattern, odds are, what you're doing is a candidate for being factored out, hierarchal decompositions is the buzzword you'd see in the textbooks if you're following along with any of them, but it's really just the idea of taking out common code and putting it into just one place.

任何时候你发现你处于这种模式中，可能，你所做的东西是可以提取改进的，体系分解是一个你在课本中看到的流行词,如果你遵循其中一个,这个实际上是一个把相同的代码,放到一个地方的思想。

哈佛公开课 - 计算机科学课程节选