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\n\n\n\n\n Limit an async function's concurrency with ease!\n
\n\n## Features\n\n- **Tiny:** only ~300 B minzipped\n- **Flexible:** works for any function that returns a `Promise`\n\n## Install\n\n```sh\n$ npm i limit-concur\n```\n\n## Usage\n\n```js\nimport limitConcur from 'limit-concur'\n\nconst categories = await (\n await fetch(`https://api.chucknorris.io/jokes/categories`)\n).json()\n\nlet pendingRequests = 0\nconst getChuckNorrisJoke = async category => {\n console.log(`pending requests: ${++pendingRequests}`)\n const response = await fetch(\n `https://api.chucknorris.io/jokes/random?category=${encodeURIComponent(category)}`,\n )\n const { value } = await response.json()\n console.log(`pending requests: ${--pendingRequests}`)\n return value\n}\n\nconst limitedGetChuckNorrisJoke = limitConcur(4, getChuckNorrisJoke)\n\n// At most 4 requests are pending at any given time!\nconst jokes = await Promise.all(categories.map(limitedGetChuckNorrisJoke))\nconsole.log(jokes)\n//=> pending requests: 1\n//=> pending requests: 2\n//=> pending requests: 3\n//=> pending requests: 4\n//=> pending requests: 3\n//=> pending requests: 4\n//=> ...\n//=> pending requests: 3\n//=> pending requests: 2\n//=> pending requests: 1\n//=> pending requests: 0\n//=> [\n// 'Chuck Norris once rode a nine foot grizzly bear through an automatic car wash, instead of taking a shower.',\n// \"Chuck Norris is actually the front man for Apple. He let's Steve Jobs run the show when he's on a mission. Chuck Norris is always on a mission.\",\n// \"Bill Gates thinks he's Chuck Norris. Chuck Norris actually laughed. Once.\",\n// 'Chuck Norris can install iTunes without installing Quicktime.',\n// ...\n// ]\n```\n\n### Recipes\n\n#### Replacing [`p-map`](https://github.com/sindresorhus/p-map)\n\n```js\nimport limitConcur from 'limit-concur'\n\nconst urls = [`https://tomeraberba.ch`, `https://lfi.dev`, `https://npmjs.com`]\n\nconst mapper = async url => {\n const { redirected } = await fetch(url, { method: `head` })\n return redirected\n}\n\nconst results = await Promise.all(urls.map(limitConcur(2, mapper)))\nconsole.log(results)\n//=> [ false, false, true ]\n```\n\n#### Replacing [`p-all`](https://github.com/sindresorhus/p-all)\n\n```js\nimport limitConcur from 'limit-concur'\n\nconst actions = [\n () => fetch(`https://tomeraberba.ch`),\n () => fetch(`https://lfi.dev`),\n () => checkSomething(),\n () => doSomethingElse(),\n]\n\nconst results = await Promise.all(\n actions.map(limitConcur(2, action => action())),\n)\nconsole.log(results)\n//=> [ ..., ..., ... ]\n```\n\n#### Replacing [`p-limit`](https://github.com/sindresorhus/p-limit)\n\n```js\nimport limitConcur from 'limit-concur'\n\nconst limit = limitConcur(1, fn => fn())\n\nconst input = [\n limit(() => fetchSomething(`foo`)),\n limit(() => fetchSomething(`bar`)),\n limit(() => doSomething()),\n]\n\nconst results = await Promise.all(input)\nconsole.log(results)\n//=> [ ..., ..., ... ]\n```\n\n#### Replacing [`p-filter`](https://github.com/sindresorhus/p-filter)\n\n```js\nimport limitConcur from 'limit-concur'\n\nconst urls = [`https://tomeraberba.ch`, `https://lfi.dev`, `https://npmjs.com`]\n\nconst filterer = async url => {\n const { redirected } = await fetch(url, { method: `head` })\n return !redirected\n}\n\nconst results = await Promise.all(\n urls.map(limitConcur(2, async url => ({ url, keep: await filterer(url) }))),\n)\nconst filtered = results.flatMap(({ url, keep }) => (keep ? [url] : []))\nconsole.log(filtered)\n//=> [ 'https://tomeraberba.ch', 'https://lfi.dev' ]\n```\n\n#### Replacing [`p-props`](https://github.com/sindresorhus/p-props)\n\n```js\nimport limitConcur from 'limit-concur'\n\nconst urls = {\n tomer: `https://tomeraberba.ch`,\n lfi: `https://lfi.dev`,\n npm: `https://npmjs.com`,\n}\n\nconst mapper = async url => {\n const { redirected } = await fetch(url, { method: `head` })\n return redirected\n}\n\nconst results = Object.fromEntries(\n await Promise.all(\n Object.entries(urls).map(\n limitConcur(2, async ([name, url]) => [name, await mapper(url)]),\n ),\n ),\n)\nconsole.log(results)\n//=> { tomer: false, lfi: false, npm: true }\n```\n\n## Contributing\n\nStars are always welcome!\n\nFor bugs and feature requests,\n[please create an issue](https://github.com/TomerAberbach/limit-concur/issues/new).\n\n## License\n\n[MIT](https://github.com/TomerAberbach/limit-concur/blob/main/license) ©\n[Tomer Aberbach](https://github.com/TomerAberbach) \\\n[Apache 2.0](https://github.com/TomerAberbach/limit-concur/blob/main/license-apache) ©\n[Google](https://github.com/TomerAberbach/limit-concur/blob/main/notice-apache)\n","readmeFilename":"readme.md"} ![\"CI\"](\"https://github.com/TomerAberbach/limit-concur/workflows/CI/badge.svg\"){kind=icon}
\n \n \n ![\"Sponsor\"](\"https://img.shields.io/static/v1?label=Sponsor&message=%E2%9D%A4&logo=GitHub&color=%23fe8e86\")
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