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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_7_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.6 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 16

Operating system: iOS 16.7.5

Device Platform: Mobile

Date tested: 2 years ago

typeof

6.0M/s

5.9M/s

hasOwnProperty

5.8M/s

bool

5.6M/s

undefined

2.0M/s

View exact numbers

Script Preparation code:

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

Tests: