An Objective-C object encapsulating a concurrent dispatch queue with methods that implement the concurrent reader writer access pattern using dispatch_barrier_async.
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Objective-C categories on NSDictionary and NSArray that give you methods like `-(NSString *)stringForKey:` in addition to `-(id)objectForKey:`. These methods do all the necessary type checks inside and return nil if the object's class does not match. They will also create meaningful errors to help you debug your code. This can save you some typing when working with NSJSONSerialization or Plist deserialization, where you have dictionaries of unknown content.
An Objective-C class to validate the output of NSJSONSerialization against a JSON Schema (http://json-schema.org).
An experiment to use Cocoa Autolayout to create a CollectionView on OS X that works more closely to a view based NSTableView.
a class to parse & create MIME formatted messages, including multipart