Your question: What is EventEmitter and how is it used in Node JS?

How does EventEmitter work in node JS?

EventEmitter is a class that helps us create a publisher-subscriber pattern in NodeJS. With an event emitter, we can simply raise a new event from a different part of an application, and a listener will listen to the raised event and have some action performed for the event.

What is the use of EventEmitter?


Use in components with the @Output directive to emit custom events synchronously or asynchronously, and register handlers for those events by subscribing to an instance.

What is EventEmitter on property?

EventEmitter provides multiple properties like on and emit. on property is used to bind a function with the event and emit is used to fire an event.

Which special object is an instance of EventEmitter in node JS?

EventEmitter Class. The event module contains the EventEmitter class. The Util package provides a way to inherit from one class to another class. The “EventEmitter” class allows us to listen for events and assign actions to run when those events occur.

What is Libuv in Nodejs?

libuv is a multi-platform C library that provides support for asynchronous I/O based on event loops. It supports epoll(4) , kqueue(2) , Windows IOCP, and Solaris event ports. It is primarily designed for use in Node. js but it is also used by other software projects.

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What is setImmediate?

The setImmediate function is used to execute a function right after the current event loop finishes. In simple terms, the function functionToExecute is called after all the statements in the script are executed. It is the same as calling the setTimeout function with zero delays.