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43 lines
1.5 KiB
JavaScript
43 lines
1.5 KiB
JavaScript
/**
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* Copyright (C) 2023 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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* Runs async tasks in parallel, with a limit
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*
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* Note: JavaScript is not multithreaded.
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* This will not let you run tasks in parallel, use it only to limit how many network requests should be
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* running at once.
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* @template T
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* @template U
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* @param items {T[]} the items to iterate through
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* @param task {(item: T, index: number) => Promise<U>} the task to be run
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* @param [limit] {number} the maximum number of tasks that should be run asynchronously
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* @returns {Promise<U[]>}
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*/
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export async function mapAsyncLimit(items, task, limit = 5) {
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return Promise.all(
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Array.from({length: limit}).map(async () => {
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let i = 0;
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/** @type {U[]} */
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const results = [];
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for (let item = items.shift(); item !== undefined; item = items.shift()) {
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results.push(await task(item, i));
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i++;
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}
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return results;
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}),
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).then(it => it.flat());
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}
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