Run results for: Map has vs Object []

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 YaBrowser/24.1.0.0 Safari/537.36

Browser: Yandex Browser 24

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Map has	0.2 Ops/sec
Object []	0.3 Ops/sec

Script Preparation code:

var map = new Map();
var obj = {};

var i = 1e7;
while (i--) {
  map.set(i, i);
  obj[i] = i;
}

var noop = Function.prototype;

var s = 0;

Tests:

Map has
i = 1e7; s = 0; while (i--) { if (map.has(i)) s += 1; }
Object []
i = 1e7; s = 0; while (i--) { if (obj[i]) s += 1; }