ES6 Map vs Object properties (v88)

Revision 88 of this benchmark created by jin on

Description

Compare native Map implementation vs using an object as a hash map. This revision takes the time to compute a random string out of the loop, which highlights the actual speed difference much better.

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;
}

var preComputedRandomKeys = [];
var preComputedRandomVals = [];

for (var i=0; i < 100000; i++) {
   preComputedRandomKeys[i] = randomString();
   preComputedRandomVals[i] = randomString();
}
</script>

Setup

var map = new Map();
    var obj = {};
    
    var map2 = new Map();
    var obj2 = {};
    
    for (var i=0; i < 100000; i++) {
       map2.set(preComputedRandomKeys[i], preComputedRandomVals[i]);
       obj2[preComputedRandomKeys[i]] = preComputedRandomVals[i];
    }
    
    for (var i=0; i < 100000; i++) {
       map2.set(preComputedRandomKeys[i], map2.get(preComputedRandomKeys[i]));
       obj2[preComputedRandomKeys[i]] = obj2[preComputedRandomKeys[i]];
    }

Test runner

Ready to run.

Testing in
TestOps/sec
map.set(key,val)
for (var i=0; i < 100000; i++) {
   var key = preComputedRandomKeys[i];
   var val = preComputedRandomVals[i];
   map.set(key, val);
}
ready
obj[key] = val;
for (var i=0; i < 100000; i++) {
   var key = preComputedRandomKeys[i];
   var val = preComputedRandomVals[i];
   obj[key] = val;
}
ready
Iterate Map
var valx;
for (var [key, val] of map2.entries()) {
  valx = val;
}
ready
Iterate Object
var key;
for (key in obj2) {
  if (obj2.hasOwnProperty(key))
    var val = obj2[key];
}
ready
val = map.get(key)
for (var i=0; i < 100000; i++) {
   var val = map2.get(preComputedRandomKeys[i]);
}
ready
val = obj[key]
for (var i=0; i < 100000; i++) {
   var val = obj2[preComputedRandomKeys[i]];
}
ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.