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29 lines
1.1 KiB
JavaScript
29 lines
1.1 KiB
JavaScript
/**
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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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// A replacement of lodash in client code
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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 function duplicates(arr, comparator = (a, b) => a === b) {
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return arr.filter((v, vIndex) => arr.findIndex((u) => comparator(u, v)) !== vIndex);
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}
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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 function uniq(arr) {
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// Note: had problems with [...new Set()]: https://github.com/facebook/docusaurus/issues/4972#issuecomment-863895061
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return Array.from(new Set(arr));
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}
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//# sourceMappingURL=jsUtils.js.map
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