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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.84 Safari/537.36

Browser: Chrome 99

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

bool

626.3M/s

587.4M/s

typeof

508.2M/s

undefined

296.8M/s

hasOwnProperty

88.6M/s

Object.prototype.hasOwnProperty

44.3M/s

View exact numbers

Test name	Executions per second
✓ bool	626,298,240 Ops/sec
in	587,390,016 Ops/sec
typeof	508,150,528 Ops/sec
undefined	296,847,232 Ops/sec
hasOwnProperty	88,553,664 Ops/sec
Object.prototype.hasOwnProperty	44,279,072 Ops/sec

Script Preparation code:

var obj = { a: 1, b: 2, c: 3, d: 4, e: 5 };
function hasOwn (obj, key) {
  return hasOwnProperty.call(obj, key)
}

Tests: