Javascript state machine example

postReducer.js

import { ACTION_PUBLISH, ACTION_UNPUBLISH } from "./actions"

export const STATUS_DRAFT = "STATUS_DRAFT"
export const STATUS_PUBLISHED = "STATUS_PUBLISHED"
export const STATUS_UNPUBLISHED = "STATUS_UNPUBLISHED"

const initialState = {
  status: STATUS_DRAFT
}

export default function postReducer(state = initialState, action) {
  switch(action.type) {
    case ACTION_PUBLISH: {
      return {
        status: STATUS_PUBLISHED
      }
    }
    case ACTION_UNPUBLISH: {
      return {
        status: STATUS_UNPUBLISHED
      }
    }
    default: {
      return state;
    }
  }
}