ES6 Map vs Object properties

JavaScript performance comparison

Revision 39 of this test case created by

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);
  delete obj.x;
  
  var map2 = new Map();
  var obj2 = Object.create(null);
  delete obj2.x;
  
  for (var i = 0; i < 1000; i++) {
    var key = randomString();
    var val = randomString();
    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
map.set(key,val)
for (var i = 0; i < 1000; i++) {
  var key = randomString();
  var val = randomString();
  map.set(key, val);
}
pending…
obj[key] = val;
for (var i = 0; i < 1000; i++) {
  var key = randomString();
  var val = randomString();
  obj[key] = val;
}
pending…
Iterate Map
// async test
for (var [key, value] of map2.entries()) {
  var v = value,
    k = key;
}
pending…
Iterate Object
// async test
for (var key in obj2) {
  var v = obj2[key],
    k = key;
}
pending…
Iterate Map 2
// async test
map2.forEach(function(value, key) {
  var v = value,
    k = key;
});
pending…

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Revisions

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