Run results for: undefined vs. typeof vs. in vs. hasOwnProperty for non-existing property

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser: Chrome 137

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

undefined

84.5M/s

typeof

81.6M/s

bool

77.1M/s

76.8M/s

hasOwnProperty

43.7M/s

View exact numbers

Script Preparation code:

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

Tests: