ES6 Map vs Object properties (v69)

Revision 69 of this benchmark created by Joel Brage on

Description

Compare native Map implementation vs using an object as a hash map.

Preparation HTML

<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>

Setup

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;
    }

Test runner

Ready to run.

Testing in
TestOps/sec
map.set(key,val)
var val = randomString();
for (var i = 0; i < 10000; i++) {
  var key = i.toString();
  map.set(key, val);
}
ready
obj[key] = val;
var val = randomString();
for (var i = 0; i < 10000; i++) {
  var key = i.toString();
  obj[key] = val;
}
ready
Iterate Map
for (var key of map2.keys()) {
  var val = map2.get(key);
}
ready
Iterate Object
var key;
for (key in obj2) {
  var val = obj2[key];
}
ready
For Map
var key = "";
var keys = map2.keys();
for (var i = 0; i < keys.length; i++) {
  var val = map2.get(keys[i]);
}
ready
For Object
var key = "";
var keys = Object.keys(obj2);
for (var i = 0; i < keys.length; i++) {
  var val = obj2[keys[i]];
}
ready

Revisions

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