p-props

Like Promise.all() but for Map and Object

Useful when you need to run multiple promises concurrently and keep track of the fulfilled values by name.

Install

npm install p-props

Usage

import pProps from 'p-props';
import got from 'got';

const fetch = async url => {
    const {body} = await got(url);
    return body;
};

const sites = {
    ava: fetch('https://avajs.dev'),
    todomvc: fetch('https://todomvc.com'),
    github: fetch('https://github.com'),
    foo: 'bar'
};

console.log(await pProps(sites));
/*
{
    ava: '<!doctype …',
    todomvc: '<!doctype …',
    github: '<!doctype …',
    foo: 'bar'
}
*/

API

pProps(input, mapper?, options?)

Returns a Promise that is fulfilled when all promises in input and ones returned from mapper are fulfilled, or rejects if any of the promises reject. The fulfilled value is the same as input, but with a fulfilled version of each entry value, or the fulfilled value returned from mapper, if defined.

input

Type: Map | object

Resolves entry values that are promises. Other values are passed through.

mapper(value, key)

Type: Function

Receives the current value and key as parameters. If a value is a Promise, mapper will receive the value this Promise resolves to. Expected to return a Promise or value.

options

Type: object

See the p-map options.

pPropsAllSettled(input, mapper?, options?)

Like Promise.allSettled() but for Map and Object.

import {pPropsAllSettled} from 'p-props';
import got from 'got';

const fetch = async url => {
    const {body} = await got(url);
    return body;
};

const sites = {
    ava: fetch('https://avajs.dev'),
    todomvc: fetch('https://todomvc.com'),
    github: fetch('https://github.com'),
    foo: 'bar'
};

console.log(await pPropsAllSettled(sites));
/*
{
    ava: { status: 'fulfilled', value: '<!doctype …' },
    todomvc: { status: 'fulfilled', value: '<!doctype …' },
    github: { status: 'fulfilled', value: '<!doctype …' },
    foo: { status: 'fulfilled', value: 'bar' }
}
*/

Returns a Promise that is fulfilled when all promises in input and ones returned from mapper are settled. The fulfilled value is the same as input, but with a settled version of each entry value, or the settled value returned from mapper, if defined.

input

Type: Map | object

Resolves entry values that are promises. Other values are passed through.

mapper(value, key)

Type: Function

Receives the current value and key as parameters. If a value is a Promise, mapper will receive the value this Promise resolves to. Expected to return a Promise or value.

options

Type: object

See the p-map options.

Related

• p-all - Run promise-returning & async functions concurrently with optional limited concurrency
• p-map - Map over promises concurrently
• More…