immutable-ext

    1.1.5 • Public • Published

    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:

      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-')

    Install

    npm i immutable-ext

    DownloadsWeekly Downloads

    19,071

    Version

    1.1.5

    License

    ISC

    Unpacked Size

    158 kB

    Total Files

    8

    Last publish

    Collaborators

    • drboolean