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    What's the LazyMap.decorate and InstantiateFactory and stuff for? Commented Aug 26, 2011 at 7:30
  • +1 All the other answers seem to assume that one of the "keys" is an integer. What if the associate array was based upon two non-integer keys (a tuple we would say in python)? I believe you would need to use this approach as indexing becomes impossible. Commented Aug 30, 2012 at 13:30