ES6 Map vs Object properties (v12)

Revision 12 of this benchmark created by Stefan on

Description

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

Preparation HTML

<script>
function randomString()
{
    var text = "";
    var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

    var textLength = Math.floor(Math.random() * possible.length);
    for( var i=0; i < textLength; 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 map3 = new Map();
    var map4 = new Map();
    var map5 = new Map();
    var obj2 = {};
    
    for (var i=0; i < 1000; i++) {
       var key = randomString();
       var val = randomString();
       map2.set(key,val);
       map3.set(key,val);
       map4.set(key,val);
       map5.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 = randomString();
   var val = randomString();
   map.set(key,val);
}
ready
obj[key] = val;
for (var i=0; i < 1000; i++) {
   var key = randomString();
   var val = randomString();
   obj[key] = val;
}
ready
Iterate Map#keys
for (var key of map2.keys()) {
  var val = map2.get(key);
}
ready
Iterate Map#entries_forof
for(var entry of map3.entries()) {
  var val = entry[1];
}
ready
Iterate Map#entries_manual
var iter = map4.entries();
for(var i = iter.next(); !i.done; i = iter.next()) {
  var val = i.value[1];
}
ready
Iterate Map#values
var iter = map5.values();
for(var i = iter.next(); !i.done; i = iter.next()) {
  var val = i.value;
}
ready
Iterate Object
var key;
for (key in obj2) {
  if (obj2.hasOwnProperty(key)) {
    var val = obj2[key];
  }
}
ready
Iterate Object 2
var key;
for (key in obj2) {
    var val = obj2[key];
}
ready

Revisions

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