process.nextTick()
schedules a callback to be invoked in the same phase of the event loop, before any I/O operations.setImmediate()
schedules a callback to be executed in the next iteration of the event loop, after the current phase completes.setTimeout(callback, 0)
schedules a callback for execution after a minimum timeout, which can lead to delays based on the timer’s accuracy.Example:
console.log('Start');
process.nextTick(() => console.log('Next Tick')); // Executes first
setImmediate(() => console.log('Immediate')); // Executes second
setTimeout(() => console.log('Timeout'), 0); // Executes last
console.log('End');