ES6 Map vs Object number properties (v15)

Revision 15 of this benchmark created 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 arr = [];
    
    var map2 = new Map();
    var obj2 = Object.create(null);
    var arr2 = [];
    
    for (var i=0; i < 1000; i++) {
       var key = i;
       var val = i;
       map2.set(key,val);
       obj2[key] = val;
       arr2[key] = val;
    }

Test runner

Ready to run.

Testing in
TestOps/sec
map.set(key,val)
for (var i=0; i < 1000; i++) {
   var key = i;
   var val = i;
   map.set(key,val);
}
ready
obj[key] = val;
for (var i=0; i < 1000; i++) {
   var key = i;
   var val = i;
   obj[key] = val;
}
ready
Iterate Map
for (var key of map2.keys()) {
  var val = map2.get(key);
}
ready
Iterate Object
var key;
for (key of Object.keys(obj2)) {
    var val = obj2[key];
}
ready
Iterate Object using for...in
var key;
for (key in obj2) {
    var val = obj2[key];
}
ready
arr[key] = val;
for (var i=0; i < 1000; i++) {
   var key = i;
   var val = i;
   arr[key] = val;
}
ready
Iterate array
var key;
for (key of arr2) {
    var val = arr2[key];
}
ready
Iterate array using forEach
var key;
arr2.forEach(function (val) {
    // ...
});
ready

Revisions

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