Run results for: typeof undefined vs undefined equality check

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

typeof

11.9M/s

equality

6.4M/s

View exact numbers

Test name	Executions per second
✓ typeof	11,905,444 Ops/sec
equality	6,442,061 Ops/sec

Script Preparation code:

window.obj = undefined

Tests: