Uploaded September 2012 | Updated September 2026, 2 weeks ago
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By pavel@techytube, for more from this author visit:
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The NSSet, and NSMutableSet classes declare the programmatic interface to an unordered collection of objects.
NSSet declares the programmatic interface for static sets of distinct objects. You establish a static set's entries when it's created, and thereafter the entries can't be modified. NSMutableSet, on the other hand, declares a programmatic interface for dynamic sets of distinct objects. A dynamic—or mutable—set allows the addition and deletion of entries at any time, automatically allocating memory as needed.
You can use sets as an alternative to arrays when the order of elements isn't important and performance in testing whether an object is contained in the set is a consideration—while arrays are ordered, testing for membership is slower than with sets.
Subscribe to our channel here for notifications on new video trainings. For more videos on technology, visit our website at http://www.techytube.com.
By pavel@techytube, for more from this author visit:
techytube.com/author/pavel
The NSSet, and NSMutableSet classes declare the programmatic interface to an unordered collection of objects.
NSSet declares the programmatic interface for static sets of distinct objects. You establish a static set's entries when it's created, and thereafter the entries can't be modified. NSMutableSet, on the other hand, declares a programmatic interface for dynamic sets of distinct objects. A dynamic—or mutable—set allows the addition and deletion of entries at any time, automatically allocating memory as needed.
You can use sets as an alternative to arrays when the order of elements isn't important and performance in testing whether an object is contained in the set is a consideration—while arrays are ordered, testing for membership is slower than with sets.
