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Async/Await for ES6 with Generators and Promises
Implements async/await for ES6 (specifically for Node 6.x which is the current Node versions on the three big FaaS providers: AWS Lambda, Google Cloud Functions and Azure Functions).
See Async/Await with Generators and Promises for a blog post about this project.
Using npm:
$ npm install es6-async
In Node.js:
const makeAsync = require('es6-async')
Write code the same way you write code with async
/await
with the difference to use makeAsync
instead of the async
keyword and replace await
with yield
. Also note that makeAsync
takes a generator defined with the function*
syntax.
const makeAsync = require('es6-async')
const timeout = (milliseconds) => new Promise(resolve => setTimeout(resolve, milliseconds))
const random = () => Promise.resolve(Math.random())
const asyncFunc = makeAsync(function* () {
yield timeout(1000)
return yield random()
})
asyncFunc().then(v => console.log('Finished', v))
The same code written using async/await:
async function asyncFunc() {
await timeout(1000)
return await random()
}
asyncFunc().then(v => console.log('Finished', v))
I've found one small difference that needs to be pointed out:
const resultGen = yield Promise.resolve(100) + 100
const resultAsync = await Promise.resolve(100) + 100
// resultGen = "[object Promise]100"
// resultAsync = 200
In the case of yield
, Javascript first evaluates Promise.resolve(100) + 100
which it does by converting both to strings and then sends that to yield
. The solution to this is to wrap it in parenthesis.
const resultGen = (yield Promise.resolve(100)) + 100
// resultGen = 200
const makeAsync = require('es6-async')
const timeout = (milliseconds) => new Promise(resolve => setTimeout(resolve, milliseconds))
const random = () => Promise.resolve(Math.random())
const asyncFunc = makeAsync(function* () {
yield timeout(1000)
return yield random()
})
module.exports.randomGen = makeAsync(function*(req, res) {
res.status(200).send('Random value is: ' + (yield asyncFunc()))
})
FAQs
Async/Await for ES6 with Generators and Promises
The npm package es6-async receives a total of 2 weekly downloads. As such, es6-async popularity was classified as not popular.
We found that es6-async demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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