New var versus new bare

JavaScript performance comparison

Test case created by Josh

Info

Check variables versus bare new

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<div id="a">
</div>
<script>
Benchmark.prototype.setup = function() {
    funcA = function(data) {
      $('#a').text(data);
    }
};

Benchmark.prototype.teardown = function() {
    $('#a').text('');
};
</script>

Preparation code output

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

Testing in unknown unknown
Test Ops/sec
variable
funcB = function() {
  var o = new String('hello');
  funcA(o);
}

funcB();
pending…
variable free
funcC = function() {
  funcA(new String('hello'));
}

funcC();
pending…

You can edit these tests or add even more tests to this page by appending /edit to the URL.

Compare results of other browsers

0 comments

Add a comment