convert to Myanmar Number string

mmNumber.ts

const _mmNumbers = {
  '0': '၀',
  '1': '၁',
  '2': '၂',
  '3': '၃',
  '4': '၄',
  '5': '၅',
  '6': '၆',
  '7': '၇',
  '8': '၈',
  '9': '၉'
};

const mmNumber = (n: number | string) => {
  const nstr = typeof n === "number" ? n.toString() : n;
  let out = '';
  for (var i = 0; i < nstr.length; i++) {
    var c = nstr.charAt(i);
    out += _mmNumbers[c];
  }

  return out;
}