Question

3

Run a function a specified number of times

rated 0 times [ 6] [ 3] / answers: 1 / hits: 35067 / 12 Years ago, sun, march 25, 2012, 12:00:00

function runAgain()

{

    window.setTimeout(foo, 100);

}



function foo()

{

    //Do somthing

    runAgain();

}

I can use the above code to run a function infinite number of times with an interval of one second.

What is the standard way of running a function defined number of times. Lets say, I want foo() to be run 5 times with an interval of 1 second.

EDIT It's said that global variables should be avoided in Javascript. Isn't there a better way?

With input from answers, I created a function like this: (Working Example: http://jsbin.com/upasem/edit#javascript,html )

var foo = function() {

    console.log(new Date().getTime());  

};





var handler = function(count) {

    var caller = arguments.callee;

    //Infinite

    if (count == -1) {

        window.setTimeout(function() {

            foo();

            caller(count);

        }, 1000);

    }

    if (count > 0) {

        if (count == 0) return;

        foo();

        window.setTimeout(function() {

            caller(count - 1);

        }, 100);    

    }

    if (count == null) {foo(); }

};



handler(-1); //Runs infinite number of times

handler(0); //Does nothing

handler(2); //Runs two times

handler(); //Runs foo() one time

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claudia

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3 Years ago

answered 12 Years ago jaelynncherokeeg · Accepted Answer

Assuming you have a function:

var foo = function() {

    ...

};

or if you prefer:

function foo() {

    ...

}

you could invoke it 5 times at intervals of 1 second like that:

(function(count) {

    if (count < 5) {

        // call the function.

        foo(); 



        // The currently executing function which is an anonymous function.

        var caller = arguments.callee; 

        window.setTimeout(function() {

            // the caller and the count variables are

            // captured in a closure as they are defined

            // in the outside scope.

            caller(count + 1);

        }, 1000);    

    }

})(0);

And here's a live demo.