Run results for: Testing for false vs === undefined vs hasOwnProperty for undefined member 3

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/109.0

Browser: Firefox 109

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 2 years ago

Script Preparation code:

var n ={};

AخA
 
var n ={};

Tests:

test truth
if(!n.foo) { }
x

if(!n.foo) {
}
test undefined
if(n.foo===undefined) { }
if(n.foo===undefined)
{
}
test hasOwnProperty
if(!Object.hasOwn(n,'foo')) { }
if(!Object.hasOwn(n,'foo'))
{
}