"promisified" Array descendant with some sweetener
Let's start with some fancy stuff:
const AsyncArray = require('asya'),
urls = [
'https://www.nytimes.com/',
'https://www.theverge.com/',
'https://techcrunch.com/'
]
// assuming that fetch() takes an url and returns a Promise
urls.toAsync()
.map(fetch)
.then(pages => console.log("yay! we've got an AsyncArray containing fetched pages:", pages))Get even fancier with ES7 (Node 8+):
const total = await orderIds
.toAsync()
.reduce(async (sum, id) => sum + await getOrderAmountFromDbById(id))
console.log('total amount of orders:', total)So, it's a modified version of the native Array that re-implements some of its built-in methods to accept async functions, but otherwise identical.
There are some subtle differences between Array and AsyncArray.
AsyncArrayconstructor cannot be invoked without thenewkeywordAsyncArray.from()only takes one argument (mapFnandthisArgare not supported)
With npm:
npm install asya
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