ES6 Map vs Object properties

JavaScript performance comparison

Revision 264 of this test case created by Johan Borestad

Preparation code

<script>
function randomString()
{
    var text = "";
    var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

    for( var i=0; i < 5; i++ )
        text += possible.charAt(Math.floor(Math.random() * possible.length));

    return text;
}
</script>
      
<script>
Benchmark.prototype.setup = function() {
  var map = new Map();
  var obj = Object.create(null);
  
  var map2 = new Map();
  var obj2 = Object.create(null);
  var val = randomString();
  
  for (var i = 0; i < 10000; i++) {
    var key = i.toString();
    map2.set(key, val);
    obj2[key] = val;
  }

};
</script>

Test runner

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Java applet disabled.

Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
For Map 2
var key = "";
var keys = map2.keys();
for (let i = 0, keys = map2.keys(), len = keys.length; i < len; i++) {
  var val = map2.get(keys[i]);
}
pending…

Revisions

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