Last active
December 16, 2015 11:38
-
-
Save domenic/5428522 to your computer and use it in GitHub Desktop.
Speculative idea for `await` in JS
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
// Let `doAjax`, `fadeIn`, `fadeOut`, and `delay` be promise-returning functions. | |
// In all the following examples, `example` is meant to return a promise that is fulfilled when | |
// all operations are completed, or rejected if any of the steps fail. | |
// ES5 | |
function example() { | |
return doAjax("data.json").then(function (data) { | |
document.getElementById("data").innerText = data; | |
var status = document.getElementById("status"); | |
return fadeIn(status).then(function () { | |
return delay(2000); | |
}).then(function () { | |
return fadeOut(status); | |
}); | |
}); | |
} | |
// ES6 | |
const example = Q.async(function* () { | |
document.getElementById("data").innerText = yield doAjax("data.json"); | |
const status = document.getElementById("status"); | |
yield fadeIn(status); | |
yield delay(2000); | |
return fadeOut(status); // not sure this is right? maybe just `yield fadeOut(status); return;`? | |
}); | |
// ES-some-time-after-6 | |
function^ example() { | |
document.getElementById("data").innerText = await doAjax("data.json"); | |
const status = document.getElementById("status"); | |
await fadeIn(status); | |
await delay(2000); | |
await fadeOut(status); | |
} |
For any future visitors, @lukehoban took up this torch and has made it a TC39 proposal: https://github.com/lukehoban/ecmascript-asyncawait
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
How does it work if you have >1param ?