Instruction: Describe the differences and use cases of process.nextTick() and setImmediate() in Node.js.
Context: This question is designed to test the candidate's understanding of the Node.js event loop and the nuances of task scheduling with process.nextTick() and setImmediate().
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To start, process.nextTick() allows us to queue a function to be executed at the very next phase of the event loop, before any I/O events. This means that no matter where in the event loop a process.nextTick() is called, it will be executed before the event loop continues, even before any pending I/O tasks. It's a way to effectively prioritize certain operations, ensuring that they run as soon as possible within the next tick of the event loop.
On the other hand, setImmediate() is designed to execute a script once the current poll phase completes. It schedules callbacks to be executed after the I/O events' callbacks. Unlike process.nextTick(), which is executed before the next event loop phase, setImmediate() is intended for scenarios where you want to...