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Map over promises concurrently
Useful when you need to run promise-returning & async functions multiple times with different inputs concurrently.
$ npm install p-map
const pMap = require('p-map');
const got = require('got');
const sites = [
getWebsiteFromUsername('sindresorhus'), //=> Promise
'ava.li',
'todomvc.com',
'github.com'
];
(async () => {
const mapper = async site => {
const {requestUrl} = await got.head(site);
return requestUrl;
};
const result = await pMap(sites, mapper, {concurrency: 2});
console.log(result);
//=> ['http://sindresorhus.com/', 'http://ava.li/', 'http://todomvc.com/', 'http://github.com/']
})();
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 an Array
of the fulfilled values returned from mapper
in input
order.
Type: Iterable<Promise|any>
Iterated over concurrently in the mapper
function.
Type: Function
Expected to return a Promise
or value.
Type: Object
Type: number
Default: Infinity
Minimum: 1
Number of concurrently pending promises returned by mapper
.
Promise.all()
but for Map
and Object
MIT © Sindre Sorhus