Cocoa/Objective-C - Verify if a key exist on a NSDictionary
90129
How to check if an NSDictionary or NSMutableDictionary contains a key?
40504
Compare version numbers in Objective-C
133744
NSTextField waits until the end of a loop to update
102641
ObjectiveC: if (obj) {...} AND if (obj != nil) {...}, which is better?
68676
Testing for nil in Objective-C -- if(x != nil) vs if(x)
109083
Python: Checking if a 'Dictionary' is empty doesn't seem to work
130176
Why NSMutableDictionary don't want write to file?
72442
Can't extract needed information from NSDictionary
129122
how to do true deep copy for NSArray and NSDictionary with have nested arrays/dictionary?
61752
What's the difference between isset() and array_key_exists()?
55000
Search NSArray for value matching value
116764
How to deterministically verify that a JSON object hasn't been modified?
28050
how to remove object from NSDictionary
126818
How can I tell whether an `NSManagedObject` has been deleted?
148561
Thread safety guarantees for Objective-C runtime functions?
133619
In Objective-C why should I check if self = [super init] is not nil?
141197
In JavaScript, is there an easier way to check if a property of a property exists?