I read the other day about a special type of callback that progresses with you as you call it repeatedly. As in it does A the first time it's called and returns, then it does B the next time it's called. Eventually it signals in some way that the final action has been taken.
I can't remember what it was called and I can't find it in my history so I don't know what to search. I need help.
via Euroclydon37
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