Run results for: Math.round vs bitRound

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser: Chrome 114

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 10 months ago

Test name	Executions per second
round	3945499.0 Ops/sec
bitRound	5729771.0 Ops/sec
roundScale	3764974.0 Ops/sec

Script Preparation code:

window.roundScale = (val, scale) => { return Math.round(val * scale) / scale; };
window.round = (val, precision) => { const m = 10 ** (precision || 0); return Math.round(val * m) / m; };
window.bitRound = (val, precision) => { const m = 10 ** (precision || 0); return ((((val * m) + 0.5) << 1) >> 1) / m; };

Tests:

round
round(Math.random() * 100, 3)
bitRound
bitRound(Math.random() * 100, 3)
roundScale
roundScale(Math.random() * 100, 1000)