34 lines
1.3 KiB
TypeScript
34 lines
1.3 KiB
TypeScript
/*
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Copyright 2020 Bruno Windels <bruno@windels.cloud>
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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 {BaseObservableList} from "./BaseObservableList";
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/* inline update of item in collection backed by array, without replacing the preexising item */
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export function findAndUpdateInArray<T>(predicate: (value: T) => boolean, array: T[], observable: BaseObservableList<T>, updater: (value: T) => any | false) {
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const index = array.findIndex(predicate);
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if (index !== -1) {
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const value = array[index];
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// allow bailing out of sending an emit if updater determined its not needed
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const params = updater(value);
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if (params !== false) {
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observable.emitUpdate(index, value, params);
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}
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// found
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return true;
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}
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return false;
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}
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