Run results for: jsj 4 undefined vs. typeof vs. in vs. hasOwnProperty

Run details:

User agent: Mozilla/5.0 (Linux; Android 9; Nokia 8 Sirocco) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.90 Mobile Safari/537.36

Browser: Chrome Mobile 73

Operating system: Android

Device Platform: Mobile

Date tested: 5 years ago

Script Preparation code:

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

Tests: