Run results for: delete vs null vs undefined vs void 0 vs Object.create(null)2

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36

Browser: Chrome 69

Operating system: Linux

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++) { a = void 0; }
void 0
var a = 999; for(var i = 0; i < 1000;i++) { a = void 0; }