innerHTML vs removeChild

JavaScript performance comparison

Revision 178 of this test case created by

Preparation code

<div id="container"></div>
<style type="text/css">
    #box, #box * {
        font-size: 0;
    }
    #box * {
        display: inline-block;
        width: 1px;
        height: 1px;
        padding: 0;
        margin: 0;
        background-color: blue;
    }
</style>
      
<script>
Benchmark.prototype.setup = function() {
  var box = document.createElement('div');
  box.id = 'box';
  document.getElementById('container').appendChild(box);
  var CHILDREN = 10000;
  function refill() {
      for (var i = box.childNodes.length; i < CHILDREN; i++)
      box.appendChild(document.createElement('div'));
  }
  

};

Benchmark.prototype.teardown = function() {
  document.getElementById('container').removeChild(box);

};
</script>

Preparation code output

<div id="container"></div> <style type="text/css"> #box, #box * { font-size: 0; } #box * { display: inline-block; width: 1px; height: 1px; padding: 0; margin: 0; background-color: blue; } </style>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
remove first child
refill();
while (box.firstChild)
  box.removeChild(box.firstChild);
pending…
remove last child
refill();
while (box.lastChild)
  box.removeChild(box.lastChild);
pending…
innerHTML
refill();
box.innerHTML = '';
pending…
textContent
refill();
box.textContent = '';
pending…
hasChildNodes
refill();
while (box.hasChildNodes())
  box.removeChild(box.firstChild);
pending…
check first child
refill();
var firstChild;
while ((firstChild = box.firstChild) !== null)
  box.removeChild(firstChild);
pending…
remove by reference loop
refill();
var rubbish = box.childNodes;
for (var i = rubbish.length - 1; i >= 0; i--)
    box.removeChild(rubbish[i]);
rubbish = undefined;
pending…
remove by reference foreach
refill();
Array.prototype.slice.call(box.childNodes, 0).forEach(function (node) {
    box.removeChild(node);
});
pending…
shallow clone
refill();
var box2 = box.cloneNode(false);
box.parentNode.replaceChild(box2, box);
box = box2;
pending…

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