Calling setInterval function inside a setTimeout method in java-script getting setInterval(...) is not a function error

Question

I have a simple setTimeout function that runs at a specific time and works fine:

var now = new Date();
var milliTillExec = new Date(now.getFullYear(), now.getMonth(), now.getDate(), now.getHours(), now.getMinutes(), 0, 0) - now;
if (milliTillExec < 59500) {
    milliTillExec += 59500; 
}
window.setTimeout(function(){
    console.log('at 59:500');
},milliTillExec);

trying to add a function that runs every 300 milliseconds after the previous function fired, so I did like this :

 function runEvery300Milli(){
    var t = new Date();
    window.setInterval(function(){
        if((t.getMinutes===59 && t.getMilliseconds>499)||(t.getMinutes===0 && t.getMilliseconds<500)){
            console.log(t.getMinutes()+ ":"+t.getSeconds() + ":"+ t.getMilliseconds());
        }
    }, 300)(); 
}
var now = new Date();
var milliTillExec = new Date(now.getFullYear(), now.getMonth(), now.getDate(), now.getHours(), now.getMinutes(), 0, 0) - now;
if (milliTillExec < 59500) {
    milliTillExec += 59500; 
}
window.setTimeout(function(){
    console.log('at 59:500');
    runEvery300Milli();
},milliTillExec);

but I get the following error:

Uncaught TypeError: setInterval(...) is not a function
    at runEvery300Milli

your setinterval looks like setInterval(fn, 300)() ... since setInterval returns undefined, this is what is not a function - setInterval is, but what it returns is not - simply remove the () after , 300) — Bravo
– Bravo, Commented Oct 5, 2019 at 3:26
@Nick, I made a window.setInterval , that didn't work either — Dindar
– Dindar, Commented Oct 5, 2019 at 3:33
@Bravo you should post as answer mate not comment, as comment can vanish later on, :+1: — Code Maniac
– Code Maniac, Commented Oct 5, 2019 at 3:33
@Mostafa what Bravo explained in comment is exact reason for error, here's a Demo, — Code Maniac
– Code Maniac, Commented Oct 5, 2019 at 3:34

Bravo · Accepted Answer · 2019-10-05 03:36:46Z

4

your setinterval looks like

setInterval(fn, 300)()

... since setInterval returns undefined, this is what is not a function, and the cause of the error

i.e. setInterval is a function, but what it returns is not - simply remove the () after , 300)

function runEvery300Milli(){
    var t = new Date();
    window.setInterval(function(){
        if((t.getMinutes===59 && t.getMilliseconds>499)||(t.getMinutes===0 && t.getMilliseconds<500)){
            console.log(t.getMinutes()+ ":"+t.getSeconds() + ":"+ t.getMilliseconds());
        }
    }, 300);  // <=== removed trailing ()
}

answered Oct 5, 2019 at 3:36

Bravo

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2 Comments

Code Maniac Over a year ago

You can create a running snippet on SO, running snippet on SO, anyways +1

Bravo Over a year ago

@CodeManiac - yes, but why in this case would a running snippet of part of the OP's code help at all? I see no benefit in producing a snippet of code for such a simple error/solution - for example, yesterday I did so, stackoverflow.com/questions/58230832/… and stackoverflow.com/questions/58229257/… to show the output was a required - so I'm well aware of the tools available on SO

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