ordinal-number-suffix/index.js

add suffixes to numbers (1st, 33rd, etc.)

/**
 * Get the ordinal number with suffix from `n`
 *
 * @api public
 * @param {Number} n
 * @return {String}
 */
exports = module.exports = function (n) {
  return n + exports.suffix(+n);
};

/**
 * Get the suffix for the given `n`
 *
 * @api private
 * @param {Number} n
 * @return {String}
 */
exports.suffix = function (n) {
  n %= 100
  return Math.floor(n / 10) === 1
      ? 'th'
      : (n % 10 === 1
        ? 'st'
        : (n % 10 === 2
          ? 'nd'
          : (n % 10 === 3
            ? 'rd'
            : 'th')));
};