Basic ReduxStore implemented in Ruby

redux_store.rb

class ReduxStore
  attr_reader :current_state

  def initialize(reducer)
    @reducer = reducer
    @listeners = []
    @current_state = nil
    dispatch({})
  end

  def dispatch(action)
    @current_state = @reducer.call(@current_state, action)
    @listeners.each { |l| l.call }
  end

  def subscribe(listener)
    @listeners.push(listener)
    ->{ @listeners.delete(listener) }
  end
end