Why is event emitter used?

js allows us to create and handle custom events easily by using events module. Event module includes EventEmitter class which can be used to raise and handle custom events. The following example demonstrates EventEmitter class for raising and handling a custom event.

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What is event and event emitter?

It adds the listener at the end of the listener’s array for the specified event . Multiple calls to the same event and listener will add the listener multiple times and correspondingly fire multiple times. Both functions return emitter, so calls can be chained. Emitting events: Every event is named event in nodejs.

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