process.nextTick()
adds a callback to the next tick of the event loop, executed before any I/O operations.setImmediate()
schedules a callback after the current event loop cycle completes.setTimeout()
schedules a callback after a specified delay, allowing other I/O operations to complete first.Example:
console.log('Start');
process.nextTick(() => console.log('Next Tick')); // Runs first
setImmediate(() => console.log('Immediate')); // Runs second
setTimeout(() => console.log('Timeout'), 0); // Runs last
console.log('End');