What is the difference between setTimeout(0) and setImmediate?
setImmediate runs in the check phase, right after the poll phase, while setTimeout(0) runs in the timers phase. In most cases on the next tick, setImmediate runs before setTimeout(0), but the exact order depends on context.
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More FAQs in What Does setTimeout(0) Actually Do in Node.js?
No. It defers the callback to the timers phase of the next event loop tick, after the current stack and all microtasks (promise callbacks) complete. It is deferred, not instant.
It schedules the callback to run in the timers phase of the next event loop tick. The current code finishes, microtasks run, then the timer callback runs. It is a way to defer work to the next tick.
To defer work to the next event loop tick, letting the current stack complete and the event loop process I/O first. It is a pattern for breaking up heavy work or running code after the current operation finishes.
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