perl - Perl 的标量逗号运算符什么时候有用？

Question

是否有任何理由在 for 循环之外的任何地方使用标量逗号运算符？

Answer 1

由于 Perl 标量逗号是 C 逗号运算符的“端口”，these comments可能是合适的:

Once in a while, you find yourself in a situation in which C expects a single expression, but you have two things you want to say. The most common (and in fact the only common) example is in a for loop, specifically the first and third controlling expressions. What if (for example) you want to have a loop in which i counts up from 0 to 10 at the same time that j is counting down from 10 to 0?

因此，我认为您的直觉认为它主要在 for 循环中有用，这是一个很好的直觉。