Run results for: Should you cache Intl.DateTimeFormat (simple key)?

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.5845.1064 YaBrowser/23.9.1.1064 (beta) Yowser/2.5 Safari/537.36

Browser: Yandex Browser 23

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
No caching	7513.3 Ops/sec
With simple cache	488701.8 Ops/sec

Script Preparation code:

FORMAT = { timeZone: 'Europe/Moscow', day: '2-digit', month: 'short', year: 'numeric' }
cache = new Map()

Tests:

No caching
const date = new Intl.DateTimeFormat('en-AU', FORMAT).format(new Date())
With simple cache
const key = FORMAT.timeZone; let formatter = cache.get(key) if (!formatter) { formatter = new Intl.DateTimeFormat('en-AU', FORMAT) cache.set(key, formatter) } const date = formatter.format(new Date())

Run results for: Should you cache Intl.DateTimeFormat (simple key)?

Testing creating a new Intl.DateTimeFormat each time vs. caching it using simple string as the key.

No caching

With simple cache