Node is similar in design to and influenced by systems like Ruby's Event 
Machine <http://rubyeventmachine.com/> or Python's 
Twisted<http://twistedmatrix.com/>. 
*



Node takes the event model a bit further—it presents the event loop as a 
language construct instead of as a library. In other systems there is 
always a blocking call to start the event-loop. Typically one defines 
behavior through callbacks at the beginning of a script and at the end 
starts a server through a blocking call like EventMachine::run(). In Node 
there is no such start-the-event-loop call. Node simply enters the event 
loop after executing the input script. Node exits the event loop when there 
are no more callbacks to perform. This behavior is like browser 
javascript—the event loop is hidden from the user.*

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