Run results for: Map vs Object Improved

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36

Browser: Chrome 92

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Map lookup	575.2 Ops/sec
Obj lookup	646.8 Ops/sec

Script Preparation code:

var map = new Map();
var obj = {};
var string = "a";
for(let i = 0; i < 1000; i++)
{
	map.set(string, 5);
	obj[string] = 5;
  	string+="a"
}
var i = 0, count = 1000, a;

Tests:

Map lookup
var mapString = "a"; for (i = 0; i < count; i++) { a = map.has(mapString); mapString += "a" }
Obj lookup
var objString = "a"; for (i = 0; i < count; i++) { a = obj.hasOwnProperty(objString) objString += "a" }

Run results for: Map vs Object Improved

Lookup of map vs object

Map lookup

Obj lookup