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p-map

Map over promises concurrently

  • 4.0.0
  • Source
  • npm
  • Socket score

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increased by7.05%
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What is p-map?

The p-map npm package is a library that allows you to map over promises concurrently, controlling the number of promises that are running at any given time. It is useful for throttling asynchronous operations that are initiated in a loop, such as API calls, file operations, or any task that returns a promise.

What are p-map's main functionalities?

Concurrency Control

This feature allows you to control the number of promises that are executed concurrently. In the code sample, `pMap` is used to fetch a list of URLs with a concurrency limit of 2, meaning only 2 promises will be running at the same time.

const pMap = require('p-map');

const urls = [/* ... */];
const fetchUrl = async url => {/* ... */};

(async () => {
  const result = await pMap(urls, fetchUrl, {concurrency: 2});
  console.log(result);
})();

Error Handling

p-map provides options for error handling. In this example, `stopOnError` is set to false, which means that p-map will not stop mapping over the remaining items when one promise rejects. Instead, it will continue with the rest and collect all the errors.

const pMap = require('p-map');

const tasks = [/* ... */];
const doTask = async task => {/* ... */};

(async () => {
  try {
    const result = await pMap(tasks, doTask, {concurrency: 4, stopOnError: false});
    console.log(result);
  } catch (error) {
    console.error('An error occurred:', error);
  }
})();

Promise Cancellation

p-map supports promise cancellation when used with cancelable promises, such as those created with the p-cancelable package. This allows you to cancel the execution of the promises if needed.

const pMap = require('p-map');
const {CancelablePromise} = require('p-cancelable');

const tasks = [/* ... */];
const cancellableTask = task => new CancelablePromise(resolve => {/* ... */});

(async () => {
  const mapper = cancellableTask;
  const result = await pMap(tasks, mapper, {concurrency: 3});
  console.log(result);
})();

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Package last updated on 05 Mar 2020

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