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24 lines
867 B
TypeScript
24 lines
867 B
TypeScript
/*
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* Copyright (C) 2022 StApps
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation, version 3.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/**
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* Returns the difference between two arrays.
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*/
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export function differenceBy<T>(a: T[], b: T[], transform: (item: T) => unknown) {
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const disallowed = new Set(b.map(transform));
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return a.filter(item => !disallowed.has(transform(item)));
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}
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