Resolve and reduce an array of promises
npm install await-reduceResolve and reduce an array of promises
``js`
const reduce = require('await-reduce');
The behaviour matches Array.prototype.reduce.
`js`
const results = await reduce(
[
fetch('one').then(res => res.json()),
fetch('two').then(res => res.json()),
fetch('ten').then(res => res.json()),
],
(accumulator, item) => [...accumulator, item],
[]
)
The callback matches Array.prototype.reduce's 4 argument signature, except the 4th argument (array) are the results of the Promises, and the callback itself can be asynchronous as well.`js`
const results = await reduce(
[
fetch('one'),
fetch('two'),
fetch('ten'),
],
async (accumulator, response, index, array) => {
if (!response.ok) {
return accumulator
}
const data = await response.json()
return Object.assign(accumulator, data)
},
{}
)
Also available for explicit import:
`js``
const reduce = require('await-reduce/dist');