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NSEnumerator in gnustep-base allow for iteration over collection.

Using NSEnumerator

The following example demonstrates the use of NSEnumerator with an NSArray object:

 NSArray *aArray = [NSArray arrayWithObjects: @"John", @"Bob", @"Jane", nil];
 NSEnumerator *enumerator = [aArray objectEnumerator];
 id obj;
 while(obj = [enumerator nextObject])
   doSomethingWithObject( obj );

Getting an NSEnumerator from a Collection

The NSArray, NSSet, and NSDictionary collection objects all include the -objectEnumerator method. NSDictionary also includes -keyEnumerator, which enumerates over the dictionary keys instead of the objects.