491f0cd08a
* Copyright headers 1 * Licence headers 2 * Copyright Headers 3 * Copyright Headers 4 * Copyright Headers 5 * Copyright Headers 6 * Copyright headers 7 * Add copyright headers for html and config file * Replace license files and update package.json * Update with CLA * lint
38 lines
1.3 KiB
TypeScript
38 lines
1.3 KiB
TypeScript
/*
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Copyright 2024 New Vector Ltd.
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Copyright 2021 The Matrix.org Foundation C.I.C.
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SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
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Please see LICENSE files in the repository root for full details.
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*/
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import { arrayDiff, Diff } from "./arrays";
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/**
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* Determines if two sets are different through a shallow comparison.
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* @param a The first set. Must be defined.
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* @param b The second set. Must be defined.
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* @returns True if they are different, false otherwise.
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*/
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export function setHasDiff<T>(a: Set<T>, b: Set<T>): boolean {
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if (a.size === b.size) {
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// When the lengths are equal, check to see if either set is missing an element from the other.
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if (Array.from(b).some((i) => !a.has(i))) return true;
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if (Array.from(a).some((i) => !b.has(i))) return true;
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// if all the keys are common, say so
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return false;
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} else {
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return true; // different lengths means they are naturally diverged
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}
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}
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/**
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* Determines the values added and removed between two sets.
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* @param a The first set. Must be defined.
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* @param b The second set. Must be defined.
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* @returns The difference between the values in each set.
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*/
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export function setDiff<T>(a: Set<T>, b: Set<T>): Diff<T> {
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return arrayDiff(Array.from(a), Array.from(b));
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}
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