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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36

Browser: Chrome 68

Operating system: Linux

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
undefined	4681878.0 Ops/sec
typeof	17374810.0 Ops/sec
in	16120700.0 Ops/sec
hasOwnProperty	15574840.0 Ops/sec
double bang	17338540.0 Ops/sec
exists	17179900.0 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' );
double bang
!! obj.d;
exists
obj.d;