Nodejs Utililty Methods Number to Ordinal Format

Number.prototype.toOrdinal = function() {
  var n = this % 100;
  var suffix = ["th", "st", "nd", "rd", "th"];
  var ord = n < 21 ? (n < 4 ? suffix[n] : suffix[0]) : (n % 10 > 4 ? suffix[0] : suffix[n % 10]);
  return this + ord;
};

Number.prototype.toOrdinal = function() {
  var s = ['th','st','nd','rd'];
  var v = this%100;
  return this + (s[(v-20)%10]||s[v]||s[0]);
};

Number.prototype.toOrdinal = function() {
    var n = this % 100,
        suffix = ['th', 'st', 'nd', 'rd', 'th'],
        ord = n < 21 ? (n < 4 ? suffix[n] : suffix[0]) : (n % 10 > 4 ? suffix[0] : suffix[n % 10]);
    return this + ord;
};

Number.prototype.toOrdinal = function() {
    var n,
        s = ["th","st","nd","rd"],
        v = n % 100;
    return n + (s[(v - 20) % 10] || s[v] || s[0]);
};