ES6 Map vs Object properties

JavaScript performance comparison

Revision 258 of this test case created by Paweł Golonko

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 = {};
  
  var map2 = new Map();
  var obj2 = {};
  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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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Has Map
for (var key of map2.keys()) {
  var val = map2.has(key);
}
pending…
Has Object
var key;
for (key in obj2) {
    var val = Object.prototype.hasOwnProperty.call(obj2, key);
}
pending…

Revisions

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