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

Run details:

User agent: Mozilla/5.0 (Android 11; Mobile; rv:90.0) Gecko/90.0 Firefox/90.0

Browser: Firefox Mobile 90

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
undefined	712979100.0 Ops/sec
typeof	711700200.0 Ops/sec
in	713656500.0 Ops/sec
hasOwnProperty	715974400.0 Ops/sec
bool	716404400.0 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;