Run results for: undefined vs. typeof vs. in vs. hasOwnProperty 30 - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36

Browser: Chrome 78

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
undefined	3332629.0 Ops/sec
typeof	9414373.0 Ops/sec
in	9403065.0 Ops/sec
hasOwnProperty	7821606.0 Ops/sec
bool	8378716.0 Ops/sec
Undefined2	3393731.0 Ops/sec
undefined3	3363591.0 Ops/sec
undefined4	3359388.0 Ops/sec

Website performance monitoring

Script Preparation code:

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

Tests:

undefined
if(undefined !== obj['d']){}
typeof
if('undefined' !== typeof obj['d']){}
in
if('d' in obj){}
hasOwnProperty
if(obj.hasOwnProperty( 'd' )){}
bool
if(!!obj['d']){}
Undefined2
if(obj['d']!==undefined){}
undefined3
if(obj['d']!=undefined){}
undefined4
if(obj['d']==undefined){}