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46 lines
1.6 KiB
TypeScript
46 lines
1.6 KiB
TypeScript
/*
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Copyright 2021 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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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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