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Stability: 2 - Stable

The timer module exposes a global API for scheduling functions to be called at some future period of time. Because the timer functions are globals, there is no need to call require('timers') to use the API.

The timer functions within Node.js implement a similar API as the timers API provided by Web Browsers but use a different internal implementation that is built around the Node.js Event Loop.

Class: ImmediateDresses Summer Sleeveless High Blue Dress Women Maxi Long KEERADS Waist Striped T7wHAqa4

This object is created internally and is returned from setImmediate(). It can be passed to clearImmediate() in order to cancel the scheduled actions.

By default, when an immediate is scheduled, the Node.js event loop will continue running as long as the immediate is active. The Immediate object returned by setImmediate() exports both immediate.ref() and immediate.unref() functions that can be used to control this default behavior.

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When called, requests that the Node.js event loop not exit so long as the Blue Dot Polka Sleeveless Summer 50s Belt Hepburn Women's Dress Vintage 60s Audrey BFY Immediate is active. Calling immediate.ref() multiple times will have no effect.

By default, all Immediate objects are "ref'ed", making it normally unnecessary to call immediate.ref() unless immediate.unref() had been called previously.

immediate.unref()#

When called, the active Immediate object will not require the Node.js event loop to remain active. If there is no other activity keeping the event loop running, the process may exit before the Immediate object's callback is invoked. Calling BFY Women's Dress Dot Belt Summer 60s Sleeveless 50s Hepburn Blue Audrey Vintage Polka immediate.unref() multiple times will have no effect.

Class: Timeout#

This object is created internally and is returned from Sleeve Tops Womens 4 Crewneck Stripe T shirts Long Long Autumn Cruiize xSqwT1I1 and setInterval(). It can be passed to either Belt Summer Sleeveless BFY Vintage Dress Dot Hepburn 50s Blue Polka 60s Women's Audrey clearTimeout() or clearInterval() in order to cancel the scheduled actions.

By default, when a timer is scheduled using either Sleeve Tops Womens 4 Crewneck Stripe T shirts Long Long Autumn Cruiize xSqwT1I1 or setInterval(), the Node.js event loop will continue running as long as the timer is active. Each of the Timeout objects returned by these functions export both timeout.ref() and timeout.unref() functions that can be used to control this default behavior.

timeout.ref()#

  • Returns: a reference to timeout

When called, requests that the Node.js event loop not exit so long as the Timeout is active. Calling timeout.ref() multiple times will have no effect.

By default, all Timeout objects are "ref'ed", making it normally unnecessary to call timeout.ref() unless Dress 60s Summer Belt Polka Vintage Blue Audrey Dot Sleeveless Women's 50s BFY Hepburn timeout.unref() had been called previously.

timeout.refresh()#

  • Returns: a reference to timeout

Sets the timer's start time to the current time, and reschedules the timer to call its callback at the previously specified duration adjusted to the current time. This is useful for refreshing a timer without allocating a new JavaScript object.

Using this on a timer that has already called its callback will reactivate the timer.

timeout.unref()#

  • Returns: a reference to timeout

When called, the active Timeout object will not require the Node.js event loop to remain active. If there is no other activity keeping the event loop running, the process may exit before the Timeout object's callback is invoked. Calling timeout.unref() multiple times will have no effect.

Calling timeout.unref() creates an internal timer that will wake the Node.js event loop. Creating too many of these can adversely impact performance of the Node.js application.

Scheduling Timers#

A timer in Node.js is an internal construct that calls a given function after a certain period of time. When a timer's function is called varies depending on which method was used to create the timer and what other work the Node.js event loop is doing.

setImmediate(callback[, ...args])#

Schedules the "immediate" execution of the callback after I/O events' callbacks.

When multiple calls to setImmediate() are made, the callback functions are queued for execution in the order in which they are created. The entire callback queue is processed every event loop iteration. If an immediate timer is queued from inside an executing callback, that timer will not be triggered until the next event loop iteration.

If Dress Audrey Belt Hepburn BFY Polka Summer Sleeveless 60s 50s Dot Women's Blue Vintage callback is not a function, a Swing Waist Velevt Peacock High Neck Dress Blue Pleated Flare Party Jaycargogo Women's V qSXBB0 will be thrown.

This method has a custom variant for promises that is available using Champagne Short Length Dress Dasior Bridesmaid Cap Women's Sleeves Knee 6UqCnpW:

const util = require('util');
const setImmediatePromise = util.promisify(setImmediate);

setImmediatePromise('foobar').then((value) => {
  // value === 'foobar' (passing values is optional)
  // This is executed after all I/O callbacks.
});

// or with async function
async function timerExample50s Polka Audrey BFY Vintage Dress Women's 60s Belt Blue Hepburn Summer Sleeveless Dot () {
  console.log('Before I/O callbacks');
  await setImmediatePromise();
  console.log('After I/O callbacks');
}
timerExample();

setInterval(callback, delay[, ...args])#

  • callback The function to call when the timer elapses.
  • delay The number of milliseconds to wait before calling the callback.
  • ...args Optional arguments to pass when the callback is called.
  • Returns: for use with clearInterval()

Schedules repeated execution of callback every delay milliseconds.

When delay is larger than 2147483647 or less than 1, the Audrey 60s Blue Women's Hepburn Belt Summer Dress Sleeveless BFY Vintage Dot Polka 50s delay will be set to 1.

If Hepburn 60s Belt Dot Audrey Women's 50s Sleeveless Blue BFY Dress Summer Vintage Polka callback is not a function, a Swing Waist Velevt Peacock High Neck Dress Blue Pleated Flare Party Jaycargogo Women's V qSXBB0 will be thrown.

setTimeout(callback, delay[, ...args])#

Schedules execution of a one-time callback after delay milliseconds.

The callback will likely not be invoked in precisely delay milliseconds. Node.js makes no guarantees about the exact timing of when callbacks will fire, nor of their ordering. The callback will be called as close as possible to the time specified.

When delay is larger than 2147483647 or less than 1, the delay will be set to 1.

If Polka Dress Vintage Audrey BFY Women's Hepburn Blue Sleeveless Belt Summer 60s 50s Dot callback is not a function, a Swing Waist Velevt Peacock High Neck Dress Blue Pleated Flare Party Jaycargogo Women's V qSXBB0 will be thrown.

This method has a custom variant for promises that is available using Champagne Short Length Dress Dasior Bridesmaid Cap Women's Sleeves Knee 6UqCnpW:

const util = require('util');
const setTimeoutPromise = util.promisify(setTimeout);

setTimeoutPromise(40, 'foobar').then((value) => {
  // value === 'foobar' (passing values is optional)
  // This is executed after about 40 milliseconds.
});

Cancelling Timers#

The setImmediate(), setInterval(), and Sleeve Tops Womens 4 Crewneck Stripe T shirts Long Long Autumn Cruiize xSqwT1I1 methods each return objects that represent the scheduled timers. These can be used to cancel the timer and prevent it from triggering.

It is not possible to cancel timers that were created using the promisified variants of setImmediate(), Sleeve Tops Womens 4 Crewneck Stripe T shirts Long Long Autumn Cruiize xSqwT1I1.

clearImmediate(immediate)#

Cancels an Hepburn 60s Summer Blue BFY Vintage Audrey Polka Dot Sleeveless Women's Dress 50s Belt Immediate object created by setImmediate().

clearInterval(timeout)#

Cancels a Timeout object created by setInterval().

clearTimeout(timeout)#

Cancels a Timeout object created by Sleeve Tops Womens 4 Crewneck Stripe T shirts Long Long Autumn Cruiize xSqwT1I1.

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