https://github.com/DrBoolean/immutable-ext
fantasyland extensions for immutablejs
https://github.com/DrBoolean/immutable-ext
Last synced: 5 months ago
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fantasyland extensions for immutablejs
- Host: GitHub
- URL: https://github.com/DrBoolean/immutable-ext
- Owner: DrBoolean
- License: isc
- Created: 2016-03-25T01:48:57.000Z (about 9 years ago)
- Default Branch: master
- Last Pushed: 2019-02-10T20:33:36.000Z (about 6 years ago)
- Last Synced: 2024-08-03T23:18:22.612Z (8 months ago)
- Language: JavaScript
- Size: 72.3 KB
- Stars: 490
- Watchers: 17
- Forks: 19
- Open Issues: 5
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# immutable-ext
fantasyland extensions for immutablejs
# Install
`npm install immutable-ext`
# What is this?
In addition to the Functor, Foldable, and Monad functions, we now have:
* Monoid
* Applicative (list only right now)
* Traversable
Plus stuff that builds off of reduce like `foldMap`. Please contribute/complain as you want/need things.
## Examples
We can now traverse without messing with Array or Object:
```js
const { List, Map } = require('immutable-ext')
const Task = require('data.task')
const IO = require('fantasy-io')
// Given Http.get :: String -> Task Error Blog
List.of('/blog/1', '/blog/2')
.traverse(Task.of, Http.get)
.fork(console.error, console.log)
// List(Blog, Blog)
Map({home: "
homepage", faq: "ask me anything
"})
.traverse(IO.of, (v, k) => new IO(v => $('body').append(v)))
// IO(Map({home: "[dom]", faq: "[dom]"})
```
We can `fold` stuff down
```js
const {Disjunction, Additive} = require('fantasy-monoids')
List.of([1,2,3], [4,5,6]).fold([])
//[1,2,3,4,5,6]
Map({a: "hidy", b: "hidy", c: "ho"}).fold("")
// "hidyhidyho"
List.of(Map({a: Additive(1), b: Disjunction(true), c: "son", d: [1], e: 'wut'}),
Map({a: Additive(2), b: Disjunction(false), c: "ofa", d: [2]}),
Map({a: Additive(3), b: Disjunction(false), c: "gun", d: [3]})).fold(Map.empty),
// Map({a: Additive(6), b: Disjunction(true), c: "sonofagun", d: [1,2,3], e: 'wut'})))
```
`foldMap` some things
```js
List.of(1,2,3,4).foldMap(Additive, Additive.empty)
// Additive(10)
Map({a: true, b: false}).foldMap(Disjunction, Disjunction.empty)
// Disjunction(true)
```
We can `ap` to get us some list comprehensions
```js
List.of(x => y => x + y)
.ap(List.of('a', 'b', 'c'))
.ap(List.of('+', '-'))
// List('a+', 'a-', 'b+', 'b-', 'c+', 'c-')
```