https://github.com/zengming00/promise-all-limit

nodejs, limit the maximum number of concurrent tasks
https://github.com/zengming00/promise-all-limit

Last synced: about 1 year ago
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nodejs, limit the maximum number of concurrent tasks

• Host: GitHub
• URL: https://github.com/zengming00/promise-all-limit
• Owner: zengming00
• License: mit
• Created: 2019-05-07T09:03:04.000Z (about 7 years ago)
• Default Branch: master
• Last Pushed: 2019-05-07T10:21:25.000Z (about 7 years ago)
• Last Synced: 2025-03-13T23:46:27.252Z (over 1 year ago)
• Language: JavaScript
• Size: 2.93 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          


# promise-all-limit

nodejs, limit the maximum number of concurrent tasks

```sh

npm install promise-all-limit

```

```js

const promiseAllLimit = require('promise-all-limit');

function job_reject_b(name) {

    const text = `job ${name}`

    console.log('started', text)

    return new Promise(function (resolve, reject) {

        setTimeout(() => {

            if (name === 'b') {

                return reject(new Error('b reject'));

            }

            console.log('       ', text, 'finished')

            resolve(text);

        }, 100)

    })

}

async function test() {

    try {

        const jobs = ['a', 'b', 'c', 'd', 'e'];

        const concurrency = 3;

        const results = await promiseAllLimit(jobs, concurrency, function (item) {

            return job_reject_b(item);

        });

        console.log('results:', results)

    } catch (e) {

        console.log('---> err:', e.message);

    }

}

test();

```

will output:

```

started job a

started job b

started job c

        job a finished

started job d

        job c finished

started job e

---> err: b reject

        job d finished

        job e finished

```

# License

MIT