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promise-limit

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promise-limit

limits calls to functions that return promises

  • 2.7.0
  • latest
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  • npm
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What is promise-limit?

The promise-limit npm package allows you to limit the number of concurrent promises that are executed. This is particularly useful when dealing with a large number of asynchronous operations that could overwhelm system resources if executed all at once.

What are promise-limit's main functionalities?

Limit Concurrent Promises

This feature allows you to limit the number of concurrent promises. In this example, only 2 promises will run at the same time. The `limit.map` function takes an array of tasks and ensures that only the specified number of tasks run concurrently.

const limit = require('promise-limit')(2);

const tasks = [
  () => new Promise(resolve => setTimeout(() => resolve('Task 1'), 1000)),
  () => new Promise(resolve => setTimeout(() => resolve('Task 2'), 500)),
  () => new Promise(resolve => setTimeout(() => resolve('Task 3'), 300)),
  () => new Promise(resolve => setTimeout(() => resolve('Task 4'), 200))
];

limit.map(tasks, task => task()).then(results => {
  console.log(results); // ['Task 1', 'Task 2', 'Task 3', 'Task 4']
});

Limit Concurrent Promises with Error Handling

This feature demonstrates how to handle errors when limiting concurrent promises. If any promise rejects, the error will be caught and handled appropriately.

const limit = require('promise-limit')(2);

const tasks = [
  () => new Promise((resolve, reject) => setTimeout(() => reject('Error in Task 1'), 1000)),
  () => new Promise(resolve => setTimeout(() => resolve('Task 2'), 500)),
  () => new Promise(resolve => setTimeout(() => resolve('Task 3'), 300)),
  () => new Promise(resolve => setTimeout(() => resolve('Task 4'), 200))
];

limit.map(tasks, task => task()).then(results => {
  console.log(results); // ['Error in Task 1', 'Task 2', 'Task 3', 'Task 4']
}).catch(error => {
  console.error(error);
});

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Package last updated on 28 Jul 2018

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