Does kvo happen when a weak property is set to nil by ARC?
67839
Want to perform action when __weak ivar is niled
141451
How should I handle a failure in an init: method in Objective-C?
78469
Is a closure for dereferencing variables useful?
4434
"Least Astonishment" and the Mutable Default Argument
30417
How can I test an NSString for being nil?
46477
How to understand nil vs. empty vs. blank in Ruby
115125
Why is __strong required in fast enumeration loops with ARC
110531
Is there any reason to declare ivars if you're using properties exclusively in Objective-C?
87012
Objective-C declared @property attributes (nonatomic, copy, strong, weak)
91670
Should IBOutlets be strong or weak under ARC?
84171
What is the difference between a weak reference and an unowned reference?
36578
Can you explain “weak keys” for DES?
95453
Sending a message to nil in Objective-C
126009
Why is `a = a` `nil` in Ruby?
6630
Does var keyword in C# cause boxing?
2445
Objective-C ARC: strong vs retain and weak vs assign
27606
Detecting an undefined object property