So there's a return branch on every possible path through the code. And that's valuable, it's something you want to think about as your right your own.

所以代码中每条可能的路径,都会有一个返回值分支，这是非常有价值的,当你自己写程序的时候也应该考虑这件事。

麻省理工公开课 - 计算机科学及编程导论课程节选

So the way to think about this in terms of flow is, it starts with that if and it says, check both of those things.

因此用控制流的方式,来考虑这件事就是，程序由if开始，然后要对两件事情，都进行检查。

麻省理工公开课 - 计算机科学及编程导论课程节选