Run results for: Map vs Object property check

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser: Chrome 137

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 8 months ago

Test name	Executions per second
obj.hasOwnProperty	10069.3 Ops/sec
map.get	10323.3 Ops/sec
obj.a	10590.8 Ops/sec
map.has	10252.5 Ops/sec

Script Preparation code:

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

Tests:

obj.hasOwnProperty
for (i = 0; i < count; i++) { a = obj.hasOwnProperty('a'); }
map.get
for (i = 0; i < count; i++) { a = map.get('a'); }
obj.a
for (i = 0; i < count; i++) { a = obj.a; }
map.has
for (i = 0; i < count; i++) { a = map.has('a'); }

Run results for: Map vs Object property check

obj.hasOwnProperty

map.get

obj.a

map.has