Ask HN: The most fun and beautiful code you know of?

  function addparams(query) {
      return query.replace(/(&?)([^&=]+)=([^&]*)/g, function(m, amper, key, id) {
          var val = document.getElementById(id).value;
          return val.length > 0 ? amper + key + "=" + escape(val) : '';
      });
  }

  <input type="text" id="first" value="defaultfirst"/>
  <input type="text" id="last" value="defaultlast"/>

  $.ajax({
    url: "/path/to/page",
    data: addparams("fn=first&ln=last")
  });

  /path/to/page?fn=defaultfirst&ln=defaultlast