Run results for: Set vs object

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36

Browser: Chrome 69

Operating system: Windows

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
Set	173716.4 Ops/sec
Object	156727.2 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;
}

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