Run results for: Single instance of Intl.NumberFormat vs toLocalString

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.114 Safari/537.36

Browser: Chrome 103

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Intl.NumberFormat	1405002.4 Ops/sec
toLocalString	15168003.0 Ops/sec

HTML Preparation code:

<script> window.formatter = new Intl.NumberFormat("en-US");</script>

​x
 
​
<script> window.formatter = new Intl.NumberFormat("en-US");</script>

Tests:

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