Node.js Timer

Node.js Timer Functions

In Node.js, timer functions are global ÔÇö no import required. They schedule code to run after a delay, at intervals, or right after the current event loop phase. Mastering them is essential for asynchronous Node.js work.

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Set Timer Functions

• setTimeout(callback, ms) ÔÇö run once after a delay.
• setInterval(callback, ms) ÔÇö run repeatedly at intervals.
• setImmediate(callback) ÔÇö run after the current I/O phase.

Clear Timer Functions

• clearTimeout(id) ÔÇö cancel a setTimeout.
• clearInterval(id) ÔÇö stop a setInterval.
• clearImmediate(id) ÔÇö cancel a setImmediate.

setInterval Example

// Print every 1 second
setInterval(() => {
  console.log("Hey! 1 second completed!");
}, 1000);

setTimeout Example

setTimeout(() => {
  console.log("Runs once after 1 second");
}, 1000);

Recursive setTimeout (Cleaner than setInterval)

function recursive() {
  console.log("Tick!");
  setTimeout(recursive, 1000);
}
recursive();

Cancelling Timers

function welcome() {
  console.log("Welcome to UpdateGadh!");
}

const id1 = setTimeout(welcome, 1000);
const id2 = setInterval(welcome, 1000);

clearTimeout(id1);  // cancel the timeout
clearInterval(id2); // stop the interval

setTimeout vs setImmediate

setImmediate runs after the current poll phase, while setTimeout(fn, 0) waits for at least one tick ÔÇö useful for splitting heavy work.

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Conclusion

Timers in Node.js are global and easy to use. setTimeout, setInterval, and setImmediate cover almost every scheduling need. For more tutorials, stay tuned to .

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