24 lines
1.0 KiB
TypeScript
24 lines
1.0 KiB
TypeScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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/**
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* Gets the duplicate values in an array.
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* @param arr The array.
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* @param comparator Compares two values and returns `true` if they are equal
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* (duplicated).
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* @returns Value of the elements `v` that have a preceding element `u` where
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* `comparator(u, v) === true`. Values within the returned array are not
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* guaranteed to be unique.
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*/
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export declare function duplicates<T>(arr: readonly T[], comparator?: (a: T, b: T) => boolean): T[];
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/**
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* Remove duplicate array items (similar to `_.uniq`)
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* @param arr The array.
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* @returns An array with duplicate elements removed by reference comparison.
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*/
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export declare function uniq<T>(arr: T[]): T[];
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export declare function groupBy<K extends PropertyKey, T>(items: Iterable<T>, keySelector: (item: T, index: number) => K): Partial<Record<K, T[]>>;
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//# sourceMappingURL=jsUtils.d.ts.map
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