Run results for: Map foreach vs Object.keys.forEach

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser: Chrome 123

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one month ago

Test name	Executions per second
Map foreach	2264.4 Ops/sec
Object keys forEach	1696.3 Ops/sec

Script Preparation code:

var m = new Map();
var o = {};

void Array(1e2).fill().forEach(() => {
	void m.set(String(Math.random()), Math.random());
  	void (o[Math.random()] = Math.random());
});

Tests:

Map foreach
void m.forEach((k, v) => console.log(v));
Object keys forEach
Object.keys(o).forEach(key => console.log(o[key]))

Run results for: Map foreach vs Object.keys.forEach

Map object forach vs Object.keys foreach

Map foreach

Object keys forEach