![]() ![]() It returns the emitter which can be used in calls chaining. RemoveListener function removes the listener from the listener’s array of an event. It returns the emitter which helps in the chaining of calls. The important thing to remember about this function is that the listener added to the event by this function only executes for one time that is after adding it. This function also adds one listener to the event. listener more than once results in multiple listeners added. It returns the emitter which can be used in the chaining process.Īdds a listener to the event at the end of the listener’s array regardless of any checks like multiple entries of the same listener for the event. This method adds a listener to the event at the end of the listener’s array regardless of any checks like multiple entries of the same listener for the event. Let’s go through the description of these functions and what functionality they provide. We have gathered some important and most useful methods of the EventEmitter class. on property bind a function with the event.removeListner event fires when an event listner removes.ĮventEmitter class in Node JS provides various properties.newListner event fires when a new event listner adds or registered.Error event fires when any event throws and error. ![]() Var eventEmitter = new events.EventEmitter() To access the event emitter, see the code below. We have an Event module in Node JS that contains the eventEmitter class. In continuation of those tutorials, we will see how the event emitter in Node JS class works behind Node JS. In the previous articles, we are learning about callbacks and events. Similarly, fs.readStream emits an event upon file opening.Īll the event emitting objects are instances of events.EventEmitter. For instance, whenever a peer user connects with net.Server, it emits an event. Nodes in Node JS emit many events regularly with the help of event emitter.
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