innerHTML vs removeChild vs jquery.empty

JavaScript performance comparison

Revision 117 of this test case created by Eamon Nerbonne

Info

Which method to remove all content from an element is fastest?

Preparation code

<div id="box" style="display:none;"></div>
<script src="//ajax.googleapis.com/ajax/libs/jquery/2.0.3/jquery.min.js"></script>
<script>
function clearChildren(el) {
  var child;
  while(child=el.firstChild)
    el.removeChild(child);
}
</script>
<script>
Benchmark.prototype.setup = function() {
    var box = document.getElementById('box');
    for (var i=0;i<1000;i++){
        var c   = document.createElement('div');
        c.textContent = 'siodfj'+Date.now();
        box.appendChild(c);
    }
};

Benchmark.prototype.teardown = function() {
    if (box.childNodes.length > 0) alert('child nodes not cleared!')
};
</script>

Preparation code output

Test runner

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Testing in unknown unknown
Test Ops/sec
removeChild reversed
for (var i = box.childNodes.length - 1; i >= 0; i--) {
  box.removeChild(box.childNodes[i]);
}
 
pending…
innerHTML
box.innerHTML = '';
pending…
jQuery empty
$(box).empty()
pending…
remove firstChild
while (box.firstChild) {
        box.removeChild(box.firstChild);
}
pending…
remove lastChild
while (box.lastChild) {
        box.removeChild(box.lastChild);
}
pending…
remove firstChild function
clearChildren(box);
pending…
remove firstChild with var
while (i=box.firstChild) {
        box.removeChild(i);
}
pending…

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