Run results for: Intl.DateTimeFormat with and without init

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

With init

1.2M/s

Without init

30K/s

View exact numbers

Test name	Executions per second
✓ With init	1,212,545 Ops/sec
Without init	30,302 Ops/sec

Script Preparation code:

var dateOptions = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };
var dateTimeFormat = new Intl.DateTimeFormat('en-US', dateOptions);
var y = new Date('5/11/2018');

Tests:

With init
var z = dateTimeFormat.format(y);
Without init
var z = new Intl.DateTimeFormat('en-US', dateOptions).format(y);