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Reference Manual (Async / Callbacks)

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• wait()
  tells expecco, that although the execute() function will return, the action is still active, and that there will be a callback at some later time, which will report the outcome via success() / error() / fail().
  Needed especially for NodeJS, which makes heavy use of asynchronous callbacks (futures).
  Should be the last statement/expression before the execute function returns.

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