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Event Driven Programming
Node.js uses events heavily and it is also one of the reasons why Node.js is pretty fast compared to other similar technologies. As soon as Node starts its server, it simply initiates its variables, delcares functions and then simply waits for event to occur.
In an event-driven application, there is generally a main loop that listens for events, and then triggers a callback function when one of those events is detected.
While Events seems similar to what callbacks are. The difference lies in the fact that callback functions are called when an asynchronous function returns its result where as event handling works on the observer pattern. The functions which listens to events acts as Observers. Whenever an event gets fired, its listener function starts executing. Node.js has multiple in-built events available through events module and EventEmitter class which is used to bind events and event listeners
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