Real-time data processing with Node.js

Instruction: Explain how to implement real-time data processing in Node.js, including event sourcing and stream processing.

Context: This question assesses the candidate's ability to handle real-time data in Node.js applications, discussing concepts like event sourcing, streams for data processing, and integrating with messaging systems.

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First, let's clarify event sourcing. Event sourcing is an architectural pattern where state changes within an application are stored as a sequence of events. These events are immutable and can be replayed to reach the current state of an application. This model is incredibly beneficial for real-time data processing as it allows systems to react to each event as it occurs. In Node.js, this can be implemented using libraries like EventEmitter or through frameworks that support event-driven architectures. For real-time data processing, Node.js's stream API plays a pivotal role...

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