If I create an NSMutableArray that might have up to 2^16 elements, but will mostly be empty, will I be wasting space or is NSMutableArray implemented as a sparse array?
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If I create an NSMutableArray that might have up to 2^16 elements, but will mostly be empty, will I be wasting space or is NSMutableArray implemented as a sparse array?
Elements in an
NSArraycan’t be empty and there’s no “default” value. To representnil, you’d usually use the singleton[NSNull null], which is still a reference to an object so it consumes memory (the pointer). I’d consider usingNSDictionary(orNSMutableDictionary) with numeric (NSNumber) keys instead.