Run results for: check if obj is null or undefined

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36 Edg/114.0.1823.43

Browser: Chrome 114

Operating system: Windows

Device Platform: Desktop

Date tested: 11 months ago

Test name	Executions per second
not obj	9072898.0 Ops/sec
obj is null or obj is undefined	2963607.0 Ops/sec
type of obj is undefined or obj is null	8623800.0 Ops/sec

Script Preparation code:

var obj = window.ololo;

Tests:

not obj
var isNullOrUndefined = !obj
obj is null or obj is undefined
var isNullOrUndefined = obj === null || obj === undefined;
type of obj is undefined or obj is null
var isNullOrUndefined = typeof obj === 'undefined' || obj === null;