The Foundation framework defines a base layer of OBJECTIVE-C CLASSES. In addition to providing a set of useful primitive object classes, it introduces several paradigms that define functionality not covered by the Objective-C language. The Foundation framework is designed with these goals in mind:
The FOUNDATION FRAMEWORK includes the root object class, classes representing basic data types such as strings and byte arrays, collection classes for storing other objects, classes representing system information such as dates, and classes representing communication ports.
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The Foundation framework introduces several paradigms to avoid confusion in common situations, and to introduce a level of consistency across class hierarchies. This consistency is done with some standard policies, such as that for object ownership (that is, who is responsible for disposing of objects), and with abstract classes like NSEnumerator. These new paradigms reduce the number of special and exceptional cases in an API and allow you to code more efficiently by reusing the same mechanisms with various kinds of objects.
It is a base framework for MAC OSX, IOS application development, this is written in Objective C languages. All the classes in this framework start with NS(NEXT STEP)
EX:- NSArray, NSString etc.
NSString
NSMutable String
NS Array
NSMutableArray
NSSet
NSMutable Set
NS Data
NS Mutable Dictionary
NS Dictionary
NS Mutable Dictionary
NS Date
NS Date Formatter
NS Timer
NS User Defaults
NS Thread
NS URL
NS URL Request
NS URL Connection
NS Notification Center
NS Notification
NS Object
NS Number
NS Decimal Number
NS Value
NS Null
NS Exception
NS File Manager
NS Range
NS XML Parser
NS Operation
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