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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36

Browser: Chrome 87

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
undefined	1839141.1 Ops/sec
typeof	6994119.0 Ops/sec
in	7082482.5 Ops/sec
hasOwnProperty	6243520.5 Ops/sec
bool	6903624.0 Ops/sec
Object.prototype.hasOwnProperty.call	2012327.5 Ops/sec

Script Preparation code:

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

Tests:

undefined
undefined !== obj.d;
typeof
'undefined' !== typeof obj.d;
in
'd' in obj;
hasOwnProperty
obj.hasOwnProperty( 'd' );
bool
!! obj.d;
Object.prototype.hasOwnProperty.call
Object.prototype.hasOwnProperty.call(obj, 'd')