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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:125.0) Gecko/20100101 Firefox/125.0

Browser: Firefox 125

Operating system: Linux

Device Platform: Desktop

Date tested: 8 months ago

Test name	Executions per second
Intl.Collator.compare (ASCII-only strings)	175.5 Ops/sec
String.prototype.localeCompare (ASCII-only strings)	150.9 Ops/sec
Intl.Collator.compare	146.7 Ops/sec
String.prototype.localeCompare	123.9 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