Run results for: Array check key

Run details:

User agent: Mozilla/5.0 (Android 12; Mobile; rv:108.0) Gecko/108.0 Firefox/108.0

Browser: Firefox Mobile 108

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
Undefined	29955950.0 Ops/sec
In	28004594.0 Ops/sec

Script Preparation code:

var arr = [];
for (let i = 0; i < 1000; i++) arr[i] = i;

function randomKey() {
    return Math.floor(Math.random() * 2000);
}

Tests: