Run results for: delete vs null vs undefined vs void 0 vs Object.create(null)3

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3602.2 Safari/537.36

Browser: Chrome 72

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Tests:

null
var a = undefined for(var i = 0; i < 1000;i++) { if (a === null) { } }
undefined
var a = undefined; for(var i = 0; i < 1000;i++) { if (a === undefined) {}; }
Object.create(null)
var a = undefined; for(var i = 0; i < 1000;i++) { if (a === void 0) {}; }
void 0
var a = 999; for(var i = 0; i < 1000;i++) { a = void 0; }