ES6 Map vs Object properties

JavaScript performance comparison

Revision 120 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 = {};
  
  var map2 = new Map();
  var obj2 = {};
  
  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
Iterate Map
for (var key of map2.keys()) {
  var val = map2.get(key);
}
pending…
obj[key] = val;
var keys = [];

for (var i=0; i < 1000; i++) {
   var key = randomString();
   var val = randomString();
   keys.push(key);
   obj[key] = val;
}

// check existence, don't care about result.
for (i=0; i < keys.length; i++) {
  !!obj[key];
}
pending…
map.set(key,val)
var keys = [];

for (var i=0; i < 1000; i++) {
   var key = randomString();
   var val = randomString();
   keys.push(key);
   map.set(key,val);
}

// check existence, don't care about result.
for (i=0; i < keys.length; i++) {
  map.has(keys[i]);
}
pending…
Iterate Object
var key;
for (key in obj2) {
  if (obj2.hasOwnProperty(key)) {
    var val = obj2[key];
  }
}
pending…

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