Return value from coroutine

Questions & Answers
1

I have this non-monobehaviour script where I have a function that needed to have a delay before it does what it needs to do. But since this cannot be done, I created a Monobehaviour script to do the waitforseconds thing for my original script. And it went like this:

void Example(string message){
	StartCoroutine(sendMessage(message));
}

IEnumerator sendMessage(string message){
	yield return new WaitForSeconds(1);
	//.........
	//Send message algorithm
	//Need to return bool(if sending was successful)		
}

I needed to have the bool value in my non-monobehaviour script and I need it only after the sending is done.

So my question is, can a coroutine return a value?
If not, is there any alternate way I can do this? Thanks a lot!

3

No, you can’t. But you can use a callback

IEnumerator sendMessage(string message, Func<bool> onSuccess){
    yield return new WaitForSeconds(1);
    //.........
    //Send message algorithm
    onSuccess(result);
}
2

Here’s a good 1 that talks through extending coroutines. Does it better then I can explain.