Run results for: Polymorhpic: undefined vs. typeof vs. in vs. hasOwnProperty vs Object.hasOwn

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36 OPR/100.0.0.0 (Edition beta)

Browser: Opera 100

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
undefined	60.0 Ops/sec
typeof	192.5 Ops/sec
in	193.3 Ops/sec
hasOwnProperty	174.3 Ops/sec
bool	192.9 Ops/sec
hasOwn	57.3 Ops/sec
prototype.hasOwnProperty	55.8 Ops/sec

Script Preparation code:

var obj = { a: 1, b: 2, c: 3,  e: 5 };
var obj2 = { y: 1, z: 2, x: 3, f: 4, a: 5 };
var obj3 = { d: 100, beta: 5 };
obj3.why = 5;

Tests:

undefined
const test = (obj) => undefined !== obj.d; for(let i=0;i<10000;++i) { test(obj); test(obj2); test(obj3); test(obj); test(obj2); test(obj3); }
typeof
const test = (obj) => 'undefined' !== typeof obj.d; for(let i=0;i<10000;++i) { test(obj); test(obj2); test(obj3); test(obj); test(obj2); test(obj3); }
in
const test = (obj) => 'd' in obj; for(let i=0;i<10000;++i) { test(obj); test(obj2); test(obj3); test(obj); test(obj2); test(obj3); }
hasOwnProperty
const test = (obj) => obj.hasOwnProperty( 'd' ); for(let i=0;i<10000;++i) { test(obj); test(obj2); test(obj3); test(obj); test(obj2); test(obj3); }
bool
const test = (obj) => !! obj.d; for(let i=0;i<10000;++i) { test(obj); test(obj2); test(obj3); test(obj); test(obj2); test(obj3); }
hasOwn
const test = (obj) => Object.hasOwn(obj, 'd'); for(let i=0;i<10000;++i) { test(obj); test(obj2); test(obj3); test(obj); test(obj2); test(obj3); }
prototype.hasOwnProperty
const test = (obj) => Object.prototype.hasOwnProperty.call(obj, 'd' ); for(let i=0;i<10000;++i) { test(obj); test(obj2); test(obj3); test(obj); test(obj2); test(obj3); }

Run results for: Polymorhpic: undefined vs. typeof vs. in vs. hasOwnProperty vs Object.hasOwn

Object lookup performance with polymorphic

undefined

typeof

in

hasOwnProperty

bool

hasOwn

prototype.hasOwnProperty