"description": "An **action** is a named event that can trigger a change in your application data.\n\nActions are often broken into three parts to make your code more readable.\n\n##### 1. Actions\n\nAn **action** includes a named \"type\".\n```js\nconst action = { type: 'ACTION_NAME' };\n```\n\nActions may also include other possible params needed to transform that data.\n\n```js\nconst getItem = { type: 'GET_ITEM', clientId: 42, payload: { id: 12 } };\n```\n\nNormal params passed in are often put inside of a `payload` object. This is part of a standard called [Flux Standard Action](https://github.com/acdlite/flux-standard-action). Other common fields include `error` & `meta`.\n\n##### 2. Action Creators\n\nAn **action creator** is a functions that creates an action.\n\n```js\nconst actionName = () => ({ type: 'ACTION_NAME' });\n```\n\nAction creators make it easy to pass params into an action.\n\n```js\nconst getItem = (clientId, id) => ({ type: 'GET_ITEM', clientId: 42, payload: { id: 12 } });\n```\n\n##### 3. Action Types\n\nOften, the action name is also extracted as an **action type**. This is helpful for readability and to catch action name typos. Additionally, most editors will auto-complete your action types from the variable name.\n\n```js\nconst ACTION_NAME = 'ACTION_NAME';\nconst GET_ITEM = 'GET_ITEM';\n\nconst action = () => ({ type: ACTION_NAME });\nconst getItem = (id) => ({ type: GET_ITEM, payload: { id }});\n```\n\n> [Learn more](http://redux.js.org/docs/basics/Actions.html).\n\nLet's write an action for voting up your choice of worst pokemon.",

"tasks": [

{

"tests": [

"03/01"

],

"description": "A **reducer** is what handles the actual data transformation triggered by an action.\n\nIn it's simplest form, a **reducer** is just a function with the current **state** and current **action** passed in.\n\n```js\nconst reducer = (state, action) => {\n console.log(state);\n return state;\n};\n```\n\nWe can handle different actions by matching on the action type. If no matches are found, we just return the original state.\n\n```js\nconst ACTION_NAME = 'ACTION_NAME';\n\nconst reducer = (state, action) => {\n switch(action.type) {\n // match on action.type === ACTION_NAME\n case ACTION_NAME:\n state = 42;\n // return new state after transformation\n return state;\n default:\n return state;\n }\n};\n```\n\nOur reducer is passed in as the first param when we create our **store**.\n\n> [Learn more](http://redux.js.org/docs/basics/Reducers.html).",

"tasks": [

{

"tests": [

"04/01"

],

Let's write an action for voting up your choice of worst pokemon.

@test('03/01')

@action(open('src/index.js'))

@test('04/01')

@action(open('src/index.js'))

@hint('Try this: `const reducer = state => state;`')