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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0

Browser: Firefox 115

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Intl.NumberFormat	54973.2 Ops/sec
toLocalString	978737536.0 Ops/sec
RegExp	5784780.0 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,')

;