Answer
setImmediate runs after the poll phase. setTimeout runs after a delay. Their order may depend on event loop timing.
Quick Answer
Both schedule a callback, but at different event loop phases. setImmediate fires in the check phase — after I/O callbacks in the current iteration. setTimeout(fn, 0) fires in the timers phase of the next iteration. Inside an I/O callback, setImmediate always fires first. Outside I/O, the order is non-deterministic and depends on process performance.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ