Run results for: set.has vs. object in

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36 OPR/98.0.0.0 (Edition beta)

Browser: Opera 98

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
in object	248647.8 Ops/sec
lookup	249512.1 Ops/sec

Script Preparation code:

var a = {1 : true, 4: true, 6: true, 9: true, 14: true};
var b = new Set(Object.keys(a));

Tests:

in object
let r = false; for (let i = 0; i < 100; ++i) { r = i in a; }
lookup
let r = false; for (let i = 0; i < 100; ++i) { r = b.has(i) }

Run results for: set.has vs. object in

in object

lookup