Run results for: Typeof x === 'undefined' vs x === undefined (test without syntax error)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.84 Safari/537.36

Browser: Chrome 99

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Typeof check

795.4M/s

Strict equality

310.4M/s

View exact numbers

Test name	Executions per second
✓ Typeof check	795,415,936 Ops/sec
Strict equality	310,433,248 Ops/sec

Script Preparation code:

var x = undefined;

Tests: