OK. Note, by the way, if I chase through each possible path, like there's some IFs in here, if there's some places to go, at least in this piece of code, every possible path through this code ends in a return. And that's a good programming discipline, to make sure that happens.

注意一下,如果我跟进每一条可能的路径，像是这里的，起码在这段代码中就有很多走向，这段代码中的每一条可能路径,在结尾都会返回一个值,这就是一条很好的编程定律，请确保这样做。

麻省理工公开课 - 计算机科学及编程导论课程节选

Because the IFs are saying, if it's true do this, otherwise skip on it.

因为IF是这样的，如果结果是真的，进行如下操作，如果不是那么跳过它吧。

麻省理工公开课 - 计算机科学及编程导论课程节选