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Ilya Kantor 2017-06-03 08:15:03 +03:00
parent fb03c7d539
commit 2c57f11fdf
6 changed files with 79 additions and 44 deletions
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4
6-async/05-async-await/01-rewrite-async-2/task.md
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@ -1,9 +1,9 @@
# Rewrite "rethrow" async/await
Rewrite the "rethrow" example from the chapter <info:promise-chaining> using `async/await` instead of `.then/catch`.
Below you can find the "rethrow" example from the chapter <info:promise-chaining>. Rewrite it using `async/await` instead of `.then/catch`.
And get rid of recursion in favour of a loop in `demoGithubUser`: with `async/await` that becomes possible and is easier to develop later on.
And get rid of the recursion in favour of a loop in `demoGithubUser`: with `async/await` that becomes easy to do.
```js run
class HttpError extends Error {

9
6-async/05-async-await/article.md
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@ -119,9 +119,10 @@ async function showAvatar() {
showAvatar();
```
Pretty clean and easy to read, right?
Pretty clean and easy to read, right? Much better than before.
Please note that we can't write `await` in the top-level code. That wouldn't work:
````smart header="`await` won't work in the top-level code"
People who are just starting to use `await` tend to forget that, but we can't write `await` in the top-level code. That wouldn't work:
```js run
// syntax error in top-level code
@ -129,8 +130,8 @@ let response = await fetch('/article/promise-chaining/user.json');
let user = await response.json();
```
So we need to have a wrapping async function for the code that awaits.
So we need to have a wrapping async function for the code that awaits. Just as in the example above.
````
````smart header="`await` accepts thenables"
Like `promise.then`, `await` allows to use thenable objects (those with a callable `then` method). Again, the idea is that a 3rd-party object may be not a promise, but promise-compatible: if it supports `.then`, that's enough to use with `await`.