bluebird: update

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Rico Sta. Cruz 2017-09-04 10:54:41 +08:00
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@ -1,39 +1,45 @@
---
title: bluebird.js
category: JavaScript libraries
layout: default-ad
layout: 2017/sheet
weight: -1
updated: 2017-09-04
---
### Also see
Also see the [promise cheatsheet](promise.html) and [Bluebird.js API](https://github.com/petkaantonov/bluebird/blob/master/API.md) (github.com).
{:.center.brief-intro}
### Example
```js
promise
.then(okFn, errFn)
.spread(okFn, errFn) //*
.spread(okFn, errFn) // *
.catch(errFn)
.catch(TypeError, errFn) //*
.finally(fn) //*
.map(function (e) { ... })
.each(function (e) { ... })
.catch(TypeError, errFn) // *
.finally(fn) // *
.map(function (e) { ··· }) // *
.each(function (e) { ··· }) // *
```
----
Those marked with `*` are non-standard Promise API that only work with Bluebird promises.
### Multiple return values
Use [Promise.spread](http://bluebirdjs.com/docs/api/promise.spread.html).
```js
.then(function () {
return [ 'abc', 'def' ];
return [ 'abc', 'def' ]
})
.spread(function (abc, def) {
...
});
···
})
```
{: data-line="4"}
Use [Promise.spread](http://bluebirdjs.com/docs/api/promise.spread.html)
### Multiple promises
Use [Promise.join](http://bluebirdjs.com/docs/api/promise.join.html).
```js
Promise.join(
@ -41,10 +47,13 @@ Promise.join(
getMessages(),
getTweets(),
function (pics, msgs, tweets) {
return ...;
return ···
}
)
```
{: data-line="1"}
Use [Promise.join](http://bluebirdjs.com/docs/api/promise.join.html)
### Multiple promises (array)
@ -66,17 +75,17 @@ Promise.any(promises)
.then(results => {
})
```
Use [Promise.map](http://bluebirdjs.com/docs/api/promise.map.html) to "promisify" a list of values.
{: data-line="1,8"}
```js
Promise.map(urls, url => fetch(url))
.then(...)
.then(···)
```
{: data-line="1"}
Use [Promise.map](http://bluebirdjs.com/docs/api/promise.map.html) to "promisify" a list of values.
### Object
Usually it's better to use `.join`, but whatever.
```js
Promise.props({
@ -88,9 +97,11 @@ Promise.props({
res.posts
})
```
{: data-line="1"}
Usually it's better to use `.join`, but whatever.
### Chain of promises
Use [Promise.try](http://bluebirdjs.com/docs/api/promise.try.html).
```js
function getPhotos() {
@ -100,19 +111,23 @@ function getPhotos() {
})
}
getPhotos().then(...)
getPhotos().then(···)
```
{: data-line="2"}
### Using Node-style functions
See [Promisification](http://bluebirdjs.com/docs/api/promisification.html).
Use [Promise.try](http://bluebirdjs.com/docs/api/promise.try.html).
### Node-style functions
```js
var readFile = Promise.promisify(fs.readFile)
var fs = Promise.promisifyAll(require('fs'))
```
{: data-line="2"}
See [Promisification](http://bluebirdjs.com/docs/api/promisification.html).
### Promise-returning methods
See [Promise.method](http://bluebirdjs.com/docs/api/promise.method.html).
```js
User.login = Promise.method((email, password) => {
@ -120,11 +135,13 @@ User.login = Promise.method((email, password) => {
throw new Error("Email not valid")
return /* promise */
});
})
```
{: data-line="1"}
See [Promise.method](http://bluebirdjs.com/docs/api/promise.method.html).
### Generators
See [Promise.coroutine](http://bluebirdjs.com/docs/api/promise.coroutine.html).
```
User.login = Promise.coroutine(function* (email, password) {
@ -133,6 +150,8 @@ User.login = Promise.coroutine(function* (email, password) {
})
```
See [Promise.coroutine](http://bluebirdjs.com/docs/api/promise.coroutine.html).
## Reference
<http://bluebirdjs.com/docs/api-reference.html>