30 lines
732 B
TypeScript
30 lines
732 B
TypeScript
// Copyright 2021-2022 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import { every } from './iterables';
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const add = <T>(set: Readonly<Set<T>>, item: T): Set<T> =>
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new Set(set).add(item);
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export const remove = <T>(
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set: Readonly<Set<T>>,
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...items: ReadonlyArray<T>
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): Set<T> => {
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const clone = new Set(set);
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for (const item of items) {
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clone.delete(item);
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}
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return clone;
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};
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export const toggle = <T>(
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set: Readonly<Set<T>>,
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item: Readonly<T>,
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shouldInclude: boolean
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): Set<T> => (shouldInclude ? add : remove)(set, item);
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export const isEqual = (
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a: Readonly<Set<unknown>>,
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b: Readonly<Set<unknown>>
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): boolean => a === b || (a.size === b.size && every(a, item => b.has(item)));
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