Run results for: Testing for false vs undefined vs == null vs hasOwnProperty vs hasOwn for undefined member

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36

Browser: Chrome 96

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Tests:

test false
var n = {}; while(true) { if(!n.foo) break; }
test undefined
var n = {}; while(true) { if(n.foo===undefined) break; }
test hasOwnProperty
var n = {}; while(true) { if(!n.hasOwnProperty('foo')) break; }
test == null
var n = {}; while(true) { if(n.foo==null) break; }
test == undefined
var n = {}; while(true) { if(n.foo==undefined) break; }
test static hasOwnProperty
var n = {}; while(true) { if(!Object.hasOwnProperty(n,'foo')) break; }
test static hasOwn
var n = {}; while(true) { if(!Object.hasOwn(n, 'foo')) break; }