Run results for: Intl.NumberFormat vs toLocalString vs RegExp - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36

Browser: Chrome 108

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Intl.NumberFormat	14084.5 Ops/sec
toLocalString	7020343.5 Ops/sec
RegExp	1100901.9 Ops/sec

Tests:

Intl.NumberFormat
var a = new Intl.NumberFormat("en-US").format("10000");
toLocalString
var a = "10000".toLocaleString("en-US");
RegExp
"10000".toString().replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1,')

;