String array to int array.

Here is polyfill for map: Array.prototype.map() - JavaScript | MDN

You can use several things to convert a string to a number. For what you're doing, I use:

var myNum = parseInt('0')//will give an interger. This will strip any string elements like px after the number.

var myNum = parseFloat('0')//will give an floating number

var myNum = Number('0')//will not give just an integer if the original number is a floating point number. Will give NaN error if any string elements are included.

var myNum = Math.round('0')//will give an interger and round the number.

var myNum = Math.ceil('0')//will give an interger and always round up.

var myNum = Math.floor('0')//will give an interger and always round down.

This may help.

var variablesList = [];    
       var variableFile= new File("C://Users//FCT//Documents//testVar.txt"); //open order.txt file  
        variableFile.open('r');  
        while (!variableFile.eof) { //get all lines from order txt file  
        st = variableFile.readln();  
        variablesList.push(st);   
  } //end of all lines from order txt file   
        variableFile.close();  
   //  alert(startFrom);  
apronBlackCounter=variablesList[0].split(',');  
apronFuchsiaCounter=variablesList[1].split(',');  
apronRedCounter=variablesList[2].split(',');  
apronRoyalBlueCounter=variablesList[3].split(',');  
alert(typeof(apronBlackCounter[0]));
alert(typeof(Number(apronBlackCounter[0])));

what about this:

var myArray = myString.split(",");

This will convert string to array. Replace "," if you use other character as a separator.