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

Run details:

User agent: Mozilla/5.0 (Android 10; Mobile; rv:85.0) Gecko/85.0 Firefox/85.0

Browser: Firefox Mobile 85

Operating system: Android

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
undefined	444896064.0 Ops/sec
typeof	447007008.0 Ops/sec
in	443907200.0 Ops/sec
hasOwnProperty	443257856.0 Ops/sec
bool	444806400.0 Ops/sec
Object.prototype.hasOwnProperty.call	440043680.0 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')