Event-Driven Programming is a term that is simply used when referring to the flow of events in either a click, load and so forth. EDP is very imperative when it comes to today’s most common programming languages like the java and the c#.
In Node.js, an event driven process is used. What is surprising is that the Node.js application runs through one thread but with callback system, its becomes very possible to achieve a concurrency.
HOW DOES THE NODE APPLICATION WORK?
A callback is an event that is invoked immediately after a certain task has been completed. Most Node.js API’s are single threaded; thus they require an asynchronous function calls to enable the maintenance of a concurrency.
An observer pattern enables a Node.js thread to maintain an event loop. Therefore, immediately a given task is completed, a corresponding task is initialized that sends a signal to the event-listener to start its execution.
An overview of the Event Driven Programming.
In this concept, an event emitter emits several events and the main loop immediately listens to them which causes it to trigger a callback function after the detection of the event in the loop. The function of the event emitter is thus to simplify the interaction in the event loop.
The callback works like an event but it’s only called in the event when the asynchronous returns its result.
Node.js heavily relies on the use of events making it a pretty fast application in comparison to other related technologies. When the Node the server starts, it in turn initiates it variables, declares and awaits functioning of the event.
The multiple inbuilt modules within the Node.js together with the Event Emitter binding the events forms generalized and a customized listener.
Its therefore clear that Node.js event modules are responsible for the creation of events, event handlers and emitters. An event loop consists of an entry region where an event is triggered invoking the event handler to produce more than one event that will execute them one after the other thus the generation of an Event Driven Programming.
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