Run results for: cached Intl.NumberFormat vs new Intl.NumberFormat vs toLocaleString currency

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_1_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.1.1

Device Platform: Mobile

Date tested: one year ago

toLocaleString

29.6M/s

cached Intl.NumberFormat

2.7M/s

new Intl.NumberFormat

35K/s

View exact numbers

Test name	Executions per second
✓ toLocaleString	29,560,740 Ops/sec
cached Intl.NumberFormat	2,700,648 Ops/sec
new Intl.NumberFormat	34,766 Ops/sec

Tests:

cached Intl.NumberFormat
window.a = window.a || new Intl.NumberFormat('en-US', { style: 'currency', currency: 'EUR' }); window.a.format("10000")
new Intl.NumberFormat
new Intl.NumberFormat('en-US', { style: 'currency', currency: 'EUR' }).format('10000');
toLocaleString
"10000".toLocaleString('en-US', { style: 'currency', currency: 'EUR' })