93 lines
1.3 KiB
Markdown
93 lines
1.3 KiB
Markdown
---
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title: bluebird.js
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layout: default
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---
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### Creating promises
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```js
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var Promise = require("bluebird");
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new Promise(function (ok, err) {
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doStuff(function () {
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if (success)
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ok();
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else
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err();
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});
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})
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```
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### Consuming promises
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```js
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promise
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.then(okFn, errFn)
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.spread(okFn, errFn)
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.catch(errFn)
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.catch(TypeError, errFn)
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.finally(fn)
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```
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### Handling simultaneous promises
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Via Arrays
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```js
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var promises = [
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promise1(), promise2(), ...
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]
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Promise.all(promises) // succeeds when all succeed
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.then(...)
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Promise.any(promises) // succeeds if one succeeds first
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.then(...)
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```
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or Objects
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```js
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Promise.props({
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photos: get('photos'),
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posts: get('posts')
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})
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.then(function (res) {
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res.photos
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res.posts
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})
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```
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### Turn foreign promises into Bluebird promises
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```js
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Promise.resolve($.get('http://google.com'))
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.then(...)
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```
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### Consuming arrays
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```js
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getFiles()
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.map(function (e) { ... })
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.each(function (e) { ... });
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```
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### Chain of promises
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```js
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Promise.try(function () {
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if (err) throw new Error("boo");
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return result;
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});
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### Working with node-style functions
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```js
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var readFile = Promise.promisify(fs.readFile);
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var fs = Promise.promisifyAll(require('fs'));
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```
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### References
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* https://github.com/petkaantonov/bluebird/blob/master/API.md
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