Explain the order of Event Listeners execution in Node.js

In Node.js, the execution order of event listeners is determined primarily by the sequence in which they are added to the EventEmitter instance. This behavior is consistent across various methods of adding listeners, ensuring a predictable flow of execution that adheres to the order of registration.

Synchronous Execution

Node.js executes all listeners synchronously in the order they were registered to the event. This means that when an event is emitted, the EventEmitter calls the listeners one by one, following the sequence they were added[2][4]. This synchronous invocation is crucial as it maintains the sequence of operations and helps prevent race conditions and logical errors that might occur in an asynchronous environment.

Adding Listeners

When you add a listener using the on or addListener methods, it is appended to the end of the listeners array for that particular event[2][4]. For example, if you add three listeners to the 'connection' event, they will be invoked in the order they were added when the 'connection' event is emitted.

Prepending Listeners

Node.js also provides a prependListener method, which allows you to add a listener to the beginning of the listeners array[2]. This method can be used when you need a particular listener to execute before others that have already been added.

One-time Listeners

The once method is used to add a one-time listener to an event. This listener will be invoked only the first time the event is emitted, after which it is automatically removed[2][4]. The order of execution for one-time listeners also follows the order in which they are added relative to other one-time and persistent listeners.

Asynchronous Switching

Although listeners are executed synchronously by default, Node.js provides options to switch to...