sectom/functions/ordinalSuffix.js

Sectom is a useful npm package that has multiple easy to use functions.

/**
 * Returns the ordinal suffix of a given string or number
 * @param {string | number} o
 * @example
 * ordinal_suffix("1") // 1st
 * ordinal_suffix(2)   // 2nd
 * ordinal_suffix("3") // 3rd
 * ordinal_suffix(4)   // 4th
 * @returns {string}
 */

function ordinal_suffix(o) {
  const i = parseInt(o);
  var j = i % 10,
    k = i % 100;
  if (j == 1 && k != 11) {
    return i + "st";
  }
  if (j == 2 && k != 12) {
    return i + "nd";
  }
  if (j == 3 && k != 13) {
    return i + "rd";
  }
  return i + "th";
}

module.exports = ordinal_suffix;