Run results for: Intl.NumberFormat vs toLocalString

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:87.0) Gecko/20100101 Firefox/87.0

Browser: Firefox 87

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Intl.NumberFormat	42684.1 Ops/sec
toLocalString	662625216.0 Ops/sec

Tests:

Intl.NumberFormat
var a = new Intl.NumberFormat("en-US").format("10000");
AخA

var a = new Intl.NumberFormat("en-US").format("10000");
toLocalString
var a = "10000".toLocaleString("en-US");
var a = "10000".toLocaleString("en-US");