The Foundation Framework

Class

Abstract

NSObject

NSObject is the root class of most Objective-C class hierarchies.

NSArray

NSArray and its subclass NSMutableArray manage ordered collections of objects called arrays.

NSMutableArray

The NSMutableArray class declares the programmatic interface to objects that manage a modifiable array of objects.

NSAssertionHandler

NSAssertionHandler objects are automatically created to handle false assertions.

NSAttributedString