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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36 Edg/136.0.0.0

Browser: Chrome 136

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

127.7M/s

typeof

126.1M/s

optional chaining undefined

123.2M/s

undefined

120.2M/s

bool

106.7M/s

hasOwnProperty

79.1M/s

Object.hasOwnProperty

66.3M/s

View exact numbers

Test name	Executions per second
✓ in	127,650,680 Ops/sec
typeof	126,078,144 Ops/sec
optional chaining undefined	123,192,248 Ops/sec
undefined	120,160,184 Ops/sec
bool	106,656,024 Ops/sec
hasOwnProperty	79,064,760 Ops/sec
Object.hasOwnProperty	66,343,560 Ops/sec

Script Preparation code:

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

Tests: