ES6 Map vs Object properties

JavaScript performance comparison

Revision 190 of this test case created by Serhii

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);
  
  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 Object.keys 
const iterate = key => obj2[key];
Object.keys(obj2).forEach(iterate);
 pending…
map.set(key,val) 
for (var i=0; i < 1000; i++) {
   var key = randomString();
   var val = randomString();
   map.set(key,val);
}
 pending…
iterate map forEach 
map2.forEach(val => val);
 pending…
iterate map forEach cached 
var iterate = val => val;
map2.forEach(iterate);
 pending…
Iterate Object 
var key;
for (key in obj2) {
  if (obj2.hasOwnProperty(key)) {
    var val = obj2[key];
  }
}
 pending…
Iterate Map 
for (var key of map2.keys()) {
  var val = map2.get(key);
}
 pending…
obj[key] = val; 
for (var i=0; i < 1000; i++) {
   var key = randomString();
   var val = randomString();
   obj[key] = val;
}
 pending…

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