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36 lines
1.1 KiB
TypeScript
36 lines
1.1 KiB
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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// This module is browser compatible.
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/**
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* Returns all distinct elements that appear at least once in each of the given
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* arrays.
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*
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* @typeParam T The type of the elements in the input arrays.
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*
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* @param arrays The arrays to intersect.
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*
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* @returns An array of distinct elements that appear at least once in each of
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* the given arrays.
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*
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* @example Basic usage
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* ```ts
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* import { intersect } from "@std/collections/intersect";
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* import { assertEquals } from "@std/assert";
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*
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* const lisaInterests = ["Cooking", "Music", "Hiking"];
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* const kimInterests = ["Music", "Tennis", "Cooking"];
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* const commonInterests = intersect(lisaInterests, kimInterests);
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*
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* assertEquals(commonInterests, ["Cooking", "Music"]);
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* ```
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*/
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export function intersect<T>(...arrays: (readonly T[])[]): T[] {
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const [array, ...otherArrays] = arrays;
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let set = new Set(array);
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for (const array of otherArrays) {
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set = set.intersection(new Set(array));
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if (set.size === 0) break;
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}
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return [...set];
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}
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