Weak Self -- Closure Rules of Thumb
In Swift, you can weak-ify references to self in escaping closures, and then you need to deal with the case that the reference is gone when the block is called. Last month, Benoit Pasquier and Chris Downie presented different takes on the problem. That discussion was excellent. It prompted me to take some more time to revisit this problem systematically, and I took away a couple of notes for future-me.