30 lines
1.1 KiB
TypeScript
30 lines
1.1 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 { useState } from "react";
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// Hook to simplify managing state of arrays of a common type
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export const useStateArray = <T>(initialSize: number, initialState: T | T[]): [T[], (i: number, v: T) => void] => {
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const [data, setData] = useState<T[]>(() => {
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return Array.isArray(initialState) ? initialState : new Array(initialSize).fill(initialState);
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});
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return [data, (index: number, value: T) => setData(data => {
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const copy = [...data];
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copy[index] = value;
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return copy;
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})];
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};
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