q vs. getElementById vs. getElementsByClassName vs. jQuery (v148)

Revision 148 of this benchmark created by ZAlexz on

Preparation HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js">
</script>
<p id="bar" class="my-bar">
  Bar
</p>
<div id="coo" class="my-foo">
  <div id="car" class="my-bar">
    <div id="caz" class="my-bar">
<div id="hoo" class="my-boo">
  <div id="har" class="my-bar">
    <div id="haz" class="my-bar">
<div id="yoo" class="my-boo">
  <div id="yar" class="my-bar">
    <div id="yaz" class="my-bar">
<div id="zoo" class="my-boo">
  <div id="zar" class="my-bar">
    <div id="zaz" class="my-bar">

      <span id="baz" class="my-baz">Baz</span>

    </div>
  </div>
</div>
    </div>
  </div>
</div>
    </div>
  </div>
</div>
    </div>
  </div>
</div>

Setup

var zaz = document.getElementById('zaz');
    
    function El(el){ this._el = el; }
    El.prototype.append = function append(el){ this._el.appendChild(el); return this; }
    
    function q(id){ return new El(document.getElementById(id)); }
    function qq(_class){ return document.getElementsByClassName(_class); }
    function qqTag(tag){ return document.getElementsByTagName(tag); }
    
    function qs(selector){ return new 
        El(document.querySelector(selector)); }
    // NOTE: querySelectorAll() is, like JQuery, which is even WORSE... incredibly SLOW & to be avoided at all cost!
    
    function $q(selector){
      if (typeof selector === 'object'){
        return new El(selector);
      } else {
        if (selector.indexOf('#') === 0) return q(selector.substr(1));
        if (selector.indexOf('.') === 0) return qq(selector.substr(1));
        if (selector.match( /[\#\.\[\ \:]/ ) ) return qs(selector);
        else return qqTag(selector);
      }
    }
    
    
    function DOMcomb(parent, filter_callback) {
        var elems = [], cs = parent.children, len = cs.length; 
        if (filter_callback(parent)) elems.push(parent);
        if (len) for (var i = 0; i < len; ++i) DOMcomb(cs[i], filter_callback);
        return elems;      /// return the results array
    }

Test runner

Ready to run.

Testing in
TestOps/sec
getElementById
var baz = document.getElementById("baz");
ready
q(id)
var baz = q('baz');
ready
el.getElementsByClassName
var baz = zaz.getElementsByClassName('my-baz');

/// can we make this faster somehow, with DOMcomb()?!
 
ready
qq(class)
var baz = qq('my-baz');
ready
DOMcomb(el)
var baz = DOMcomb(zaz, 
  function(el){ return (el.className.indexOf('my-baz') >= 0);
});
ready
$q(#id)
var baz = $q("#baz");
// that's right, we're still 4x faster than the JQuery base case!
// >> var baz = $("#baz");
ready
$(el)
var zaz = $(zaz);
ready
$q(el)
var zaz = $q(zaz);
ready

Revisions

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