Run results for: Intl.NumberFormat vs toLocalString vs Custom Format vs Pre-created Intl formatter

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36

Browser: Chrome 110

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Script Preparation code:

function formatUSD(a) {
	return '$' + a;
}

var formatIntlUSD = new Intl.NumberFormat("en-US", { style: 'currency', currency: 'USD' });

Tests:

Intl.NumberFormat
var a = new Intl.NumberFormat("en-US", { style: 'currency', currency: 'USD' }).format("10000");
toLocalString
var a = (10000).toLocaleString("en-US", { style: 'currency', currency: 'USD' });
Custom Formatter
var a = formatUSD("10000");
Pre-created Intl formatter
var a = formatIntlUSD.format("10000");