Js implementation of currency digital formatting methods

function toThousands(num) {
  var result = [ ], counter = 0;
  num = (num || 0).toString().split(' ');
  console.log(num); / / [' 2 ', '3', '1', '2', '3', '2', '1', '3', '1']
  for (var i = num.length - 1; i >= 0; i--) {
      counter++;
      result.unshift(num[i]);
      if(! (counter %3) && i ! =0) { result.unshift(', '); }}return result.join(' ');
}
const res = toThousands(231232131)
console.log(res); / / 231232131
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