ES6 Map vs Object properties with Symbol keys (v92)

Revision 92 of this benchmark created on

Description

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

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 = {};
    
    var map2 = new Map();
    var obj2 = {};
    
    for (var i=0; i < 1000; i++) {
       var key = Symbol();
       var val = randomString();
       map2.set(key,val);
       obj2[key] = val;
    }

Test runner

Ready to run.

Testing in
TestOps/sec
map.set(key,val)
for (var i=0; i < 1000; i++) {
   var key = Symbol();
   var val = randomString();
   map.set(key,val);
}
ready
obj[key] = val;
for (var i=0; i < 1000; i++) {
   var key = Symbol();
   var val = randomString();
   obj[key] = val;
}
ready
Iterate Map
var sum = 0;
var keys = map2.keys();
var n = keys.length;
for (var i = 0; i < n; i++) {
  sum += map2.get(keys[i]).length;
}
ready
Iterate Object
var key;
var sum = 0;
for (key in obj2) {
  if (obj2.hasOwnProperty(key)) {
    sum += obj2[key].length;
  }
}
ready

Revisions

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