Run results for: undefined vs. typeof vs. in vs. hasOwnProperty (Object.create(null))

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36

Browser: Chrome 89

Operating system: Linux

Device Platform: Desktop

Date tested: 3 years ago

Script Preparation code:

var obj = Object.assign(Object.create(null), {
    a: 1,
    b: 2,
    c: 3,
    d: 4,
    e: 5
});

Tests: