45 lines
1.4 KiB
TypeScript
45 lines
1.4 KiB
TypeScript
/**
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* @license
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* Copyright (C) 2017 The Android Open Source Project
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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/**
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* @param fn An iteratee function to be passed each element of
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* the array in order. Must return a promise, and the following
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* iteration will not begin until resolution of the promise returned by
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* the previous iteration.
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*
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* An optional second argument to fn is a callback that will halt the
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* loop if called.
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*/
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export function asyncForeach<T>(
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array: T[],
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fn: (item: T, stopCallback: () => void) => Promise<T>
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): Promise<T | void> {
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if (!array.length) {
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return Promise.resolve();
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}
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let stop = false;
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const stopCallback = () => {
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stop = true;
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};
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return fn(array[0], stopCallback).then(() => {
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if (stop) {
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return Promise.resolve();
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}
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return asyncForeach(array.slice(1), fn);
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});
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}
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