Run results for: Set vs object

Run details:

User agent: Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko

Browser: IE 11

Operating system: Windows 8.1

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
Set	126783.0 Ops/sec
Object	130763.9 Ops/sec

Script Preparation code:

var set = new Set();
var obj = new Object();

function makeid()
{
    var text = "";
    var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

    for( var i=0; i < 5; i++ )
        text += possible.charAt(Math.floor(Math.random() * possible.length));

    return text;
}

Tests:

Set
set.add(makeid()); set.has(makeid())
Object
obj[makeid()]=""; if (obj.hasOwnProperty(makeid())) ;