[JS] Counting Occurrences of Substrings

countingOccurrences()

function countingOccurrences(string, subString) 
{
  var foundAtPosition = 0;
  var count = 0;
   
  while (foundAtPosition != -1) {
    foundAtPosition = string.indexOf(subString, foundAtPosition);
    if (foundAtPosition != -1) {
      count++;
      foundAtPosition++;
    }
  }
  
  return count;
}