Run results for: undefined vs. typeof vs. in vs. hasOwnProperty vs. obj[key]

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36 OPR/119.0.0.0

Browser: Opera 119

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

obj[key]

261.5M/s

typeof

254.2M/s

253.4M/s

bool

241.5M/s

undefined

239.1M/s

hasOwnProperty

159.8M/s

View exact numbers

Script Preparation code:

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

Tests: