Instruction: Explain the event emitter pattern and its use cases in Node.js applications.
Context: This question aims to test the candidate's understanding of the event-driven architecture of Node.js and its benefits in asynchronous programming.
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To delve deeper, in Node.js, the event emitter pattern is implemented through the EventEmitter class, part of the events module. This class is used to bind event listeners and emit events throughout the application. When an event is emitted, all the functions attached to that specific event are called synchronously. It's a powerful way to ensure that certain parts of your application react to specific actions or data flows without waiting for a sequential process to complete, thereby enhancing efficiency and performance.
A practical application of this pattern can be seen...