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immutable-ext
Advanced tools
Readme
fantasyland extensions for immutablejs
npm install immutable-ext
In addition to the Functor, Foldable, and Monad functions, we now have:
Plus stuff that builds off of reduce like foldMap
. Please contribute/complain as you want/need things.
We can now traverse without messing with Array or Object:
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: "<div>homepage</div>", faq: "<p>ask me anything</p>"})
.traverse(IO.of, (v, k) => new IO(v => $('body').append(v)))
// IO(Map({home: "[dom]", faq: "[dom]"})
We can fold
stuff down
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
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
List.of(x => y => x + y)
.ap(List.of('a', 'b', 'c'))
.ap(List.of('+', '-'))
// List('a+', 'a-', 'b+', 'b-', 'c+', 'c-')
FAQs
fantasyland compatible extensions
We found that immutable-ext demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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