Info

Check performance of for in and for of constructs. Firefox only

Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var a = [5,6,7,8];
    a.foo = 'bar';
    var c;
  };
</script>

Test runner

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

Java applet disabled.

for(var i in a) {
  c = a[i];
}

for(c of a) {}

for([,c] of Iterator(a)) {}

var arr1 = [];
for(var i in a) {
  arr1.push(a[i]);
}

[c for(c of a)]

[c for([,c] of Iterator(a))]

Compare results of other browsers

Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published on 16th January 2013
• Revision 3: published by Simon on 16th January 2013

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