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Node.js – Timers Module – Cancelling Timers
A timer can only be cancelled after it is being scheduled. The Immediate class has an object for setImmediate() method and passes the same object to clearImmediate(), in case it wants to cancel the scheduled timer function.
Scheduling Timers
This type of timers schedules the task to take place after a certain instant of time.
setImmediate()
setInterval()
setTimeout()
Cancelling Timers
This type of timers cancels the scheduled tasks which is set to take place.
ClearImmediate()
clearInterval()
clearTimeout()
1. clearImmediate() method
This method clears the Immediate timer object that is created by the setImmediate() method.
Syntax
clearImmediate( timer )
Example
filename - clearImmediate.js
// clearImmediate() Example
var timer = setImmediate(function A() {
console.log("Timer set");
});
clearImmediate(timer);
console.log("Timer cancelled");Output
Timer cancelled
2. clearInterval() method
This method clears the Immediate timer object that is created by the setInterval() method.
Syntax
clearInterval( timer )
Example
filename - clearInterval.js
// clearInterval() Example
var si = setInterval(function A() {
return console.log("Setting Intervals for 500 ms !");
}, 500);
// Cleared the interval from 1000 ms
setTimeout(function() {
clearInterval(si);
}, 1000);Output
Setting Intervals for 500 ms !
3. clearTimeout() method
This method clears the Immediate timer object that is created by the setTimeout() method.
Syntax
clearTimeout( timerObject )
Example
filename - clearTimeout.js
// clearTimeout() Example
var timer = setTimeout(function A() {
return console.log("Hello TutorialsPoint!");
}, 500);
// timer2 will be executed
var timer2 = setTimeout(function B() {
return console.log("Welcome to TutorialsPoint!");
}, 500);
clearTimeout(timer);Output
Welcome to TutorialsPoint!
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