Run results for: undefined vs. typeof vs. in vs. operator

Run details:

User agent: Mozilla/5.0 (Linux; Android 8.1.0; ASUS_X00HD) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.6613.127 Mobile Safari/537.36

Browser: Chrome Mobile 128

Operating system: Android 8.1.0

Device Platform: Mobile

Date tested: 3 months ago

Script Preparation code:

var obj = { a: 1, b: 2, c: 3, d: 4, e: 5 };

Tests: