Run results for: toLocalDateString vs Array index

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36

Browser: Chrome 86

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
with toLocaleDateString with regex replace	10844.4 Ops/sec
Get abbreviated month from array	5639092.0 Ops/sec

Script Preparation code:

var date1 = new Date('5/09/2019');
var abbrMonthsOfYear = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];

Tests:

with toLocaleDateString with regex replace
date1.toLocaleDateString('en', {month:'short'}).replace(/\u200E/g, '');
Get abbreviated month from array
abbrMonthsOfYear[date1.getMonth()];