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orrisroot/hasDuplicate.ts

Last active June 11, 2025 03:47
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Whether an array has duplicate elements
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hasDuplicate.ts
const hasDuplicate = <T,>(items: T[], func: (a: T, b: T) => boolean = (a, b) => a === b): boolean => {
return items.find((item, idx) => items.some((item2, idx2) => func(item, item2) && idx !== idx2)) != null;
};
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