对于返回void的函数，什么都不做运算符是什么？

Question

I want to return nothing inside a function returning void. How would I do that?

Answer 1

You can do one of two things:

1. Structure the flow of the code so that there is no need for a return statement.
2. Place return; statements where you want the function to return control to the caller.

EDIT: To clarify, return; is a statement that returns control to the caller without yielding a value.

That's basically it.

Answer 2

i think sending a message to nil is a no-op

[nil message]

Sending a message to nil?