Run results for: Compare null undefined speed

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36

Browser: Chrome 95

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
explicit null check	15862390.0 Ops/sec
explicit null non-check	16000270.0 Ops/sec
explicit undefined check	16148540.0 Ops/sec
explicit undefined non-check	16019590.0 Ops/sec
implicit undefined check	16098290.0 Ops/sec
implicit undefined non-check	16109460.0 Ops/sec

Script Preparation code:

var one = { a: 123, b: null }
var two = { a: 123, b: undefined }
var three = {a: 123}

Tests: