[JS] Quick solution to needing an ordinal suffix on a number. ( st nd rd th )

Ordinal Suffix solution

// adds st nd rd th to number
// returns suffix-appended string or FALSE
function ordinal_suffix (num) {
  var val=parseInt(num);
  if ( isNaN(val) ) return false;
  var mod_ten = Math.abs(val) % 10;
  var mod_hun = Math.abs(val) % 100;
  
  if ( (mod_ten == 1) && (mod_hun != 11) ) return val + "st";
  else if ( (mod_ten == 2) && (mod_hun != 12) ) return val + "nd";
  else if ( (mod_ten == 3) && (mod_hun != 13) ) return val + "rd";
  else return val + "th";
}