Run results for: undefined vs. typeof vs. in vs. hasOwnProperty vs optional chaining - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36

Browser: Chrome 97

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
undefined	4906870.0 Ops/sec
typeof	12900410.0 Ops/sec
in	12776910.0 Ops/sec
hasOwnProperty	11837060.0 Ops/sec
bool	12895550.0 Ops/sec
Optional chaining	4879955.0 Ops/sec

Website performance monitoring

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;
Optional chaining
undefined !== obj?.d;