Redux.ex (elixir)

_redux.ex

defmodule Redux do
  @moduledoc """
  Like redux.js, but more elixir-like
  
      store = create_store fn state, action -> ... end
      store |> get_state()
      store |> dispatch(%{ type: "publish" })
  """

  defstruct reducer: nil, state: nil

  @doc """
  Creates a store
  """
  def create_store(reducer, initial_state \\ nil) do
    %Redux{reducer: reducer, state: initial_state}
    |> dispatch(%{ type: :"@@redux/INIT" })
  end

  @doc """
  Returns the current state
  """
  def get_state(store) do
    store.state
  end

  @doc """
  Dispatches an action
  """
  def dispatch(store, action) do
    store
    |> Map.put(:state, store.reducer.(get_state(store), action))
  end
end

example.ex

defmodule Example do
  import Redux

  def reducer(state, action) do
    case action.type do
      :set ->
        action.value
      :add ->
        state + action.value
      _ ->
        state
    end
  end

  def run do
    store = create_store(&reducer/2)

    store = store |> dispatch(%{ type: :set, value: 2 })
    IO.puts(store |> get_state()) #=> 2

    store = dispatch(store, %{ type: :add, value: 10 })
    IO.puts(store |> get_state()) #=> 12
  end
end

Example.run