split string in two on given index and return both parts

Question

I have a string that I need to split on a given index and then return both parts, seperated by a comma. For example:

string: 8211 = 8,211
        98700 = 98,         


        

Answer 1

Something like this?...

 function stringConverter(varString, varCommaPosition)
 {
   var stringArray = varString.split("");
   var outputString = '';
   for(var i=0;i<stringArray.length;i++)
   {
     if(i == varCommaPosition)
      {
        outputString = outputString + ',';
      }

     outputString = outputString + stringArray[i];
   }  

   return outputString;
 }

Answer 2

function splitText(value, index) {
  if (value.length < index) {return value;} 
  return [value.substring(0, index)].concat(splitText(value.substring(index), index));
}
console.log(splitText('this is a testing peace of text',10));
// ["this is a ", "testing pe", "ace of tex", "t"] 

For those who want to split a text into array using the index.