Run results for: Intl.Collator.compare vs String.prototype.localeCompare (v8 ASCII fast path)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.5845.187 Safari/537.36

Browser: Chrome 116

Operating system: Windows

Device Platform: Desktop

Date tested: 6 months ago

Test name	Executions per second
Intl.Collator.compare (ASCII-only strings)	230.3 Ops/sec
String.prototype.localeCompare (ASCII-only strings)	122.2 Ops/sec
Intl.Collator.compare	144.2 Ops/sec
String.prototype.localeCompare	92.5 Ops/sec

Script Preparation code:

function randomStrings(chars, length, stringLength) {
	const randomChar = () => chars[Math.floor(Math.random() * chars.length)];
	const randomString = () => Array.from({length: stringLength}, randomChar).join("");
	return Array.from({length}, randomString);
}

var asciiStrings = randomStrings(["a", "b", "c"], 50000, 9);
var unicodeStrings = randomStrings(["간", "쟁", "뜻"], 50000, 9);

Tests:

Intl.Collator.compare (ASCII-only strings)
const collator = new Intl.Collator(); asciiStrings.sort(collator.compare);
String.prototype.localeCompare (ASCII-only strings)
asciiStrings.sort((a, b) => a.localeCompare(b));
Intl.Collator.compare
const collator = new Intl.Collator(); unicodeStrings.sort(collator.compare);
String.prototype.localeCompare
unicodeStrings.sort((a, b) => a.localeCompare(b));

Run results for: Intl.Collator.compare vs String.prototype.localeCompare (v8 ASCII fast path)

Intl.Collator.compare (ASCII-only strings)

String.prototype.localeCompare (ASCII-only strings)

Intl.Collator.compare

String.prototype.localeCompare