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objective-ccocoacocoa-touchobjectnsset

Getting an object from an NSSet

If you can't get an object with objectAtIndex: from an NSSet then how do you retrieve objects?

Solution

  • There are several use cases for a set. You could enumerate through (e.g. with enumerateObjectsUsingBlock or NSFastEnumeration), call containsObject to test for membership, use anyObject to get a member (not random), or convert it to an array (in no particular order) with allObjects.

    A set is appropriate when you don't want duplicates, don't care about order, and want fast membership testing.