Run results for: Object.hasOwnProperty vs Object in vs Object[]

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.16; rv:83.0) Gecko/20100101 Firefox/83.0

Browser: Firefox 83

Operating system: Mac OS X 10.16

Device Platform: Desktop

Date tested: 4 years ago

Script Preparation code:

var object = {};
var test = 'something10000';

for (var i = 0; i < 10000; i++) {
  object['something' + i] = true;
}

Tests: