Run results for: Intl.NumberFormat vs RegExp

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:121.0) Gecko/20100101 Firefox/121.0

Browser: Firefox 121

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Intl.NumberFormat	36439.8 Ops/sec
toLocalString	3229272.0 Ops/sec

Script Preparation code:

const formatNumberToFloat = new Intl.NumberFormat('ru-RU', {
    style: 'decimal',
    maximumFractionDigits: 2,
    minimumFractionDigits: 2,
})

Tests:

Intl.NumberFormat
const formatNumberToFloat = new Intl.NumberFormat('ru-RU', { style: 'decimal', maximumFractionDigits: 2, minimumFractionDigits: 2, }) var a = formatNumberToFloat.format("10000.999999");
toLocalString
var a = (Math.round( "10000.999999" * 100 + Number.EPSILON ) / 100).toFixed(2); var b = a.replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1 ')