Run results for: Comparing null vs undefined - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:94.0) Gecko/20100101 Firefox/94.0

Browser: Firefox 94

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
null strict	849266240.0 Ops/sec
undefined strict	808797120.0 Ops/sec
null loose	803177344.0 Ops/sec
undefined loose	780756928.0 Ops/sec

Script Preparation code:

var x;

Tests:

null strict
var y = (x === null);
undefined strict
var y = (x === undefined);
null loose
var y = (x == null);
undefined loose
var y = (x === undefined);