jQuery / Zepto highest() plugin

gistfile1.js

(function($){
  $.fn.highest = function() {
    var height, highest = 0;
    this.each(function() {
      height = $(this).height();
      if (height > highest) highest = height;
    });
    return highest;
  };
})(window.Zepto || window.jQuery);

console.log($('#classification ul').highest());