Run results for: Compare null undefined speed

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

explicit undefined check

8.7M/s

explicit undefined non-check

8.5M/s

explicit null check

8.5M/s

explicit null non-check

8.5M/s

implicit undefined check

8.5M/s

implicit undefined non-check

8.4M/s

View exact numbers

Test name	Executions per second
✓ explicit undefined check	8,685,057 Ops/sec
explicit undefined non-check	8,519,780 Ops/sec
explicit null check	8,517,670 Ops/sec
explicit null non-check	8,507,424 Ops/sec
implicit undefined check	8,487,093 Ops/sec
implicit undefined non-check	8,399,708 Ops/sec

Script Preparation code:

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

Tests: