OrderedCollections understand a whole bunch of messages that allow them to perform a variety of data structuring functions.

• For insertions and deletions: It's easy to add: (or even addLast: for queues) to an OrderedCollection. There are a variety of remove operations, such as remove:ifAbsent: (which takes a block to execute if the item to remove isn't found) and removeFirst (which is also good for queues.
• For nested data structures: Any object can be inserted into an OrderedCollection including other OrderedCollections!