It's totally legit to cull a function, get back a value, do nothing with it other than compare it to another value.

挑选一个函数是完全合法的，返回一个值，用它来做些事情而不是用它与其它的值比较。

哈佛公开课 - 计算机科学课程节选

Though this might look silly and it is, in fact, Play-doh it is a professor at Stanford University so it's legit.

虽然这看起来很2，实际上它是play-doh彩泥，它是一个斯坦福大学的教授,所以这是合法的。

哈佛公开课 - 计算机科学课程节选