If you can’t get an object with objectAtIndex: from an NSSet then how do you retrieve objects?
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If you can’t get an object with objectAtIndex: from an NSSet then how do you retrieve objects?
There are several use cases for a set. You could enumerate through (e.g. with
enumerateObjectsUsingBlockor NSFastEnumeration), callcontainsObjectto test for membership, useanyObjectto get a member (not random), or convert it to an array (in no particular order) withallObjects.A set is appropriate when you don’t want duplicates, don’t care about order, and want fast membership testing.