Run results for: typeof vs cached typeof (3 scans)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

cached typeof

13.6M/s

uncached typeof

9.3M/s

View exact numbers

Test name	Executions per second
✓ cached typeof	13,586,606 Ops/sec
uncached typeof	9,312,596 Ops/sec

Script Preparation code:

var obj = {};

Tests:

uncached typeof
for (let n = 0; n < 1000; n++) { if (typeof obj === 'object') { if (typeof obj === 'object') { if (typeof obj === 'object') { return true; } } } }
cached typeof
for (let n = 0; n < 1000; n++) { const isObject = typeof obj; if (isObject) { if (isObject) { if (typeof obj === 'object') { return true; } } } }