Run results for: undefined vs. typeof vs. in vs. hasOwnProperty 32 - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:73.0) Gecko/20100101 Firefox/73.0

Browser: Firefox 73

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
undefined	35029960.0 Ops/sec
typeof	91860200.0 Ops/sec
in	69259110.0 Ops/sec
hasOwnProperty	70251880.0 Ops/sec
bool	93481710.0 Ops/sec
Undefined2	36666320.0 Ops/sec
undefined3	37518360.0 Ops/sec
undefined4	37637630.0 Ops/sec
bool2	92777700.0 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){}
bool2
if(obj['d']){}