CoreClasses plugin consists of data structures that are implemented to support current and future plugins internally. (Those structures can of course also be used directly in REALbasic). The array of classes are highly optimized for speed. They have a built-in swap function to speed up sort algorithms. They also have built in highly optimized sort algorithm, which supports a custom compare class to compare objects. CoreClasses also has collections, dictionaries, queues, stacks, trees and more.