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https://github.com/morluto/rea
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morluto
19 lines
710 B
TypeScript
19 lines
710 B
TypeScript
/** Compare strings lexicographically by Unicode code point, independent of locale. */
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export const compareUnicodeCodePoints = (
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left: string,
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right: string,
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): number => {
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let leftIndex = 0;
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let rightIndex = 0;
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while (leftIndex < left.length && rightIndex < right.length) {
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const leftPoint = left.codePointAt(leftIndex) ?? 0;
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const rightPoint = right.codePointAt(rightIndex) ?? 0;
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const difference = leftPoint - rightPoint;
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if (difference !== 0) return difference;
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leftIndex += leftPoint > 0xffff ? 2 : 1;
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rightIndex += rightPoint > 0xffff ? 2 : 1;
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}
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if (leftIndex === left.length && rightIndex === right.length) return 0;
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return leftIndex === left.length ? -1 : 1;
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};
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