ES6 Map vs Object properties (v43)

Revision 43 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 = {};
    var keycache = [];
    var valcache = [];
    
    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;
       keycache[i] = key;
       valcache[i] = val;
    }

Test runner

Ready to run.

Testing in
TestOps/sec
map.set(key,val)
for (var i=0; i < 1000; i++) {
   var key = keycache[i];
   var val = valcache[i];
   map.set(key,val);
}
ready
obj[key] = val;
for (var i=0; i < 1000; i++) {
   var key = keycache[i];
   var val = valcache[i];
   obj[key] = val;
}
ready
Many Obj Creation
var objs = [],
    obj;
for (var i=0; i < 1000; i++) {
   obj = {};
   var key = keycache[i];
   var val = valcache[i];
   for (var j=0; j < 5; j++) {
      obj[key] = val;
   }
}
ready
Many Map Creation
var objs = [],
    obj;
for (var i=0; i < 1000; i++) {
   obj = new Map();
   var key = keycache[i];
   var val = valcache[i];
   for (var j=0; j < 5; j++) {
      obj.set(key,val);
   }
}
ready

Revisions

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