How to use indexOf to find function in array

Question

I have an array of functions.

var arrOfFunc = [];

I have script that pushes to the array, a function that redraws a google chart

There can be multiple functions depending on how many graphs i decide to put on the page

var chart = "done";

function drawChart(){ ... } //each draw chart function belongs to its own scope.

arrOfFunc.push(drawChart);

$(window).resize(function(){
   if(chart=="done"){
     chart = "waiting";
     setTimeout(function(){
       for(var i in arrOfFunc ){
         arrOfFunc[i]();
       }
       chart = "done"
     },1000);
});

The problem is i have a refresh button for the grid that reruns the whole function that:

makes the api call
rerenders the grid with drawChart()
than pushes the drawChart() function to arrOfFunc;

How can i check to see if the function already exists inside the array before deciding whether to push it to the arrOfFunc object?

Or does .indexOf() only work for strings.

Not sure you can do that. You could give a name to each function and store those in another array. — Marc Compte
– Marc Compte, Commented May 25, 2016 at 18:18
indexOf works for any data type. arrOfFunc.indexOf(drawChart) > -1 — Felix Kling
– Felix Kling, Commented May 25, 2016 at 18:18
Wouldn't it make more sense to have one drawGraph and give each graph an id that you use to render it? Like drawGraph(0); drawGraph(1); drawGraph(4324); — IMTheNachoMan
– IMTheNachoMan, Commented May 25, 2016 at 19:02

kvn · Accepted Answer · 2016-05-25 18:18:27Z

1

indexOf identifies the object in the array.

Since Javascript treats all the functions as objects, indexOf should work on functions too.

answered May 25, 2016 at 18:18

kvn

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Comments

Redu · Accepted Answer · 2016-05-25 19:32:30Z

0

It's against the fundamentals of JS to make multiple drawChart() functions. You just declare it once and invoke it from any object. The "this" that you should have referred within the function will represent the object that you are invoking it from. You best study the this and scoping in JS. I would suggest you to have a look at this

answered May 25, 2016 at 19:32

Redu

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