Run results for: !! vs. hasOwn vs. in with null obj

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36

Browser: Chrome 110

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Script Preparation code:

var obj = { a: 1, b: 2, c: 3, d: 4, e: 5 };
var obj2 = Object.create(null);
Object.assign(obj2, obj);

Tests:

exist null
for (let i = 0; i < 10000; i++) { !!obj.d; if (i % 200 === 0) { obj[i] = 5; } }
exist hasOwnProperty
for (let i = 0; i < 10000; i++) { Object.hasOwn(obj, 'd'); if (i % 200 === 0) { obj[i] = 5; } }
nonexist null
for (let i = 0; i < 10000; i++) { !!obj.f; if (i % 200 === 0) { obj[i] = 5; } }
nonexist hasOwnProperty
for (let i = 0; i < 10000; i++) { Object.hasOwn(obj, 'f'); if (i % 200 === 0) { obj[i] = 5; } }
nonexist in
for (let i = 0; i < 10000; i++) { 'd' in obj2; if (i % 200 === 0) { obj2[i] = 5; } }
exist in
for (let i = 0; i < 10000; i++) { 'f' in obj2; if (i % 200 === 0) { obj2[i] = 5; } }