Node.js Timer

Well when we say about the TImer functions in Node.js, These are global functions. And you don't need to use require() function in order to use timer functions. Below are the list of timer functions.

Set Timer Functions

setImmediate():-This function is used to execute setImmediate.

setInterval():-This function is used to define a time interval.

setTimeout():-This function is used to execute a one-time callback after delay milliseconds.

Clear Timer Functions

clearImmediate(immediateObject):-This is used to stop an immediateObject, as created by setImmediate.

clearInterval(intervalObject):-This function is used to stop an intervalObject, as created by setInterval.

clearTimeout(timeoutObject):-This function is used to prevents a timeoutObject, as created by setTimeout.

Node.js Timer setInterval Example

Below example will set a time interval of 1000 millisecond and specified comment will be displayed after every 1000 millisecond until you terminate.

File: timer1.js

setInterval(function() {
console.log("setInterval: Hey! 1 millisecond completed!..");
}, 1000);

Now you will open Node.js command prompt and run the below code:-

node timer1.js

File: timer5.js

var i =0;
console.log(i);
setInterval(function(){
i++;
console.log(i);
}, 1000);

Now open the node.js command prompt and then run the below code:

node timer5.js

Node.js Timer setTimeout() Example

File: timer1.js

setTimeout(function() {
console.log("setTimeout: Hey! 1000 millisecond completed!..");
}, 1000);

Now open Node.js command prompt and then run the below command:-

node timer1.js

This example will shows time out after every 1000 milisecond without setting a time interval. And this example uses the recursion property of a function.

File: timer2.js

var recursive = function () {
console.log("Hey! 1000 millisecond completed!..");
setTimeout(recursive,1000);
}
recursive();

Now open Node.js command prompt you need to run the following code:-

node timer2.js

Node.js setInterval(), setTimeout() and clearTimeout()

Now let see an example to use clearTimeout() function

File: timer3.js

function welcome () {
console.log("Welcome to CrackYourInterview!");
}
var id1 = setTimeout(welcome,1000);
var id2 = setInterval(welcome,1000);
clearTimeout(id1);
//clearInterval(id2);

Now open node.js command prompt and run the below command or code:-

node timer3.js

As you can see that the above example is recursive in nature. It will terminate after one step if you use ClearInterval.

Node.js setInterval(), setTimeout() and clearInterval()

Now let see an example to use clearInterval() function

File: timer3.js

function welcome () {
console.log("Welcome to CrackYourInterview!");
}
var id1 = setTimeout(welcome,1000);
var id2 = setInterval(welcome,1000);
//clearTimeout(id1);
clearInterval(id2);