What is the difference between process.nextTick, setImmediate and setTimeout?
Model answer
process.nextTick runs its callback right after the current operation, before other queued work, and promise microtasks follow. setImmediate runs in the "check" phase after I/O. setTimeout(fn, 0) runs in the timers phase after at least the delay. Order between setTimeout 0 and setImmediate from the main module is not guaranteed, but inside an I/O callback setImmediate comes first. Overusing nextTick can starve I/O.
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What Is Node.js? Install It and Run Your First Script in the course Node.js and Express: Build a Back End API from Scratch.
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