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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser: Chrome 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

undefined

82.3M/s

bool

81.9M/s

typeof

77.9M/s

72.3M/s

View exact numbers

Script Preparation code:

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

Tests: