Run results for: Intl.Collator.compare() lowercase vs sensitivity vs localeCompare

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser: Chrome 129

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

localecompare

5.3M/s

sensitivity

2.9M/s

lowercase

1.8M/s

localecompare sensitivity

51K/s

Intl.Collator

49K/s

View exact numbers

Test name	Executions per second
✓ localecompare	5,330,860 Ops/sec
sensitivity	2,894,876 Ops/sec
lowercase	1,841,596 Ops/sec
localecompare sensitivity	50,869 Ops/sec
Intl.Collator	48,563 Ops/sec

Script Preparation code:

var arr = ['A', 'a', 'B', 'b', 'C', 'c', 'D', 'd'];

var options = {
  sensitivity: 'accent'
};

var collator1 = new Intl.Collator(undefined, options);
var collator2 = new Intl.Collator();

Tests:

lowercase
arr.sort((a,b) => collator2.compare(a.toLowerCase(), b.toLowerCase()))
sensitivity
arr.sort(collator1.compare)
Intl.Collator
arr.sort((a,b) => Intl.Collator().compare(a.toLowerCase(), b.toLowerCase()))
localecompare
arr.sort((a,b) => a.toLowerCase().localeCompare(b.toLowerCase()))
localecompare sensitivity
arr.sort((a,b) => a.localeCompare(b, undefined, options))