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p-some

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p-some

Wait for a specified number of promises to be fulfilled


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What is p-some?

The p-some npm package allows you to wait for a specified number of promises to be fulfilled. It is useful when you need only a certain number of promises to resolve successfully, and you don't care about the rest.

What are p-some's main functionalities?

Wait for a specified number of promises to fulfill

This feature allows you to wait for a specified number of promises to be fulfilled. In this example, we have an array of promises, and we use p-some to wait for any 2 of them to resolve successfully. The result will be an array of the first 2 resolved values.

const pSome = require('p-some');
const promises = [
  Promise.resolve(1),
  Promise.resolve(2),
  Promise.reject(new Error('error')),
  Promise.resolve(3)
];

pSome(promises, { count: 2 }).then(values => {
  console.log(values); // [1, 2]
});

Handle rejected promises

This feature demonstrates how p-some handles rejected promises. In this example, we have an array of promises with some of them being rejected. p-some will still wait for the specified number of promises to be fulfilled and will return the resolved values. If it cannot fulfill the count due to too many rejections, it will throw an error.

const pSome = require('p-some');
const promises = [
  Promise.resolve(1),
  Promise.reject(new Error('error1')),
  Promise.reject(new Error('error2')),
  Promise.resolve(2)
];

pSome(promises, { count: 2 }).then(values => {
  console.log(values); // [1, 2]
}).catch(error => {
  console.error(error);
});

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Package last updated on 31 May 2021

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