Does setTimeout(fn, 0) execute immediately?
No. It schedules the callback for the Timers Phase after at least the specified delay.
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More FAQs in Difference Between setTimeout() and setImmediate() in Node.js
setTimeout() executes in the Timers Phase, while setImmediate() executes in the Check Phase of the Event Loop.
The order is not always guaranteed. It depends on the Event Loop state and execution context.
Use setImmediate() when you want to defer execution until the Check Phase, especially after I/O operations.
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