FoundationExtension
FoundationExtension is common Foundation/UIKit/Cocoa shortcuts and snippets collection.
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FoundationExtension is Foundation extension implementation for both OS X / iOS

Prefix 'NS' means they are implemented as pure Foundation extension, in expected way for original framework. For example, there were property access extension for lagecy getter/setter available interface. This is now compiler supported feature.

Prefix 'NSA' means they are implemented as Additional functions working for Foundation, but in its own way. Apple never supports these features in this way. But they are useful.

See also
CocoaExtension
UIKitExtension
FoundationExtension.h