Run results for: in vs. obj.hasOwnProperty vs prototype.hasOwnProperty.call

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.5993.2467 YaBrowser/23.11.0.2467 Yowser/2.5 Safari/537.36

Browser: Yandex Browser 23

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
in (true)	16126449.0 Ops/sec
in (false)	16064166.0 Ops/sec
obj.hasOwnProperty (true)	14155667.0 Ops/sec
obj.hasOwnProperty (false)	13872129.0 Ops/sec
prototype.hasOwnProperty.call (true)	4741770.0 Ops/sec
prototype.hasOwnProperty.call (false)	4914296.5 Ops/sec

Script Preparation code:

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

Tests:

in (true)
'c' in obj;
in (false)
'q' in obj;
obj.hasOwnProperty (true)
obj.hasOwnProperty('c');
obj.hasOwnProperty (false)
obj.hasOwnProperty('q');
prototype.hasOwnProperty.call (true)
Object.prototype.hasOwnProperty.call(obj, 'c');
prototype.hasOwnProperty.call (false)
Object.prototype.hasOwnProperty.call(obj, 'q');

Run results for: in vs. obj.hasOwnProperty vs prototype.hasOwnProperty.call

Object lookup performance

in (true)

in (false)

obj.hasOwnProperty (true)

obj.hasOwnProperty (false)

prototype.hasOwnProperty.call (true)

prototype.hasOwnProperty.call (false)