Skip to content
No description, website, or topics provided.
Branch: master
Clone or download
Pull request Compare This branch is 5 commits ahead of LambdaSchool:master.
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Type Name Latest commit message Commit time
Failed to load latest commit information.

Redux & React


  • redux package
  • react-redux package
  • Redux state vs react component state
  • <Provider> and createStore(reducer)
  • One state object for entire application
  • reducer functions control the values for the state properties.
  • container components are React components that connect to the Redux state
  • actions - objects produced by action creators that will be fed through all reducers.
  • mapStateToProps() & connect

Project Description

Initialize Project

  • Run create-react-app todo to create your starter application.
  • Now that you have created your todo directory, cd into it.
  • yarn add redux react-redux or npm install --save redux react-redux This command will install the needed dependencies.
  • You will create a todo list using React and Redux.
  • Use the movies project as a reference.
  • The general flow of steps will be to create your store, create your reducers, create your containers, and then create the action creators.
  • When you add a new item to the todo array an action containing the new todo object will be dispatched through all of the reducers.
  • To display the todo list you will create a container that receives the todos array as a prop and then uses map to display it as an unordered list.

State Tree

  • Your application should have an input field, a submit button, and a list of items that represents your todo list.
  • Your application's state tree should have a single property called todos. It should take the same form as the object shown below.
 todos: []
  • Each todo item that is in the todos array should have the following format:
  value: 'Walk the dog.',
  completed: false
  • You will create your store in src/index.js. The <Provider > component will wrap <App /> and you will pass the created store into <Provider > as one of its properties. Use this repository as a reference.


  • When you type a new todo list item into the input field and press the submit button you should call an action creator that adds a new todo item to the todos array on the application state tree.
  • When the user presses submit you will invoke the appropriate action creator which will then have its new action fed through all of the reducers.
  • You will display the todo list by creating a container that receives the application's todos array as a prop. That container then uses map to display the array.
  • When you click on each todo list item you will dispatch an action that will toggle that todo item's completed property to either true or false. You will need to send the id property along with what completed should be set to. The todos reducer will return a brand new array that will replace the old array. We do not mutate the original array but rather replace it with a brand new version.


  • You should only need one reducer. This reducer will control the todos array property on the state tree.
  • You will have several action creators. One for adding a new todo item and another for toggling each todo item.
  • Containers require connect and a mapStateToProps(state) function to read from the state tree.
  • Actions creators should be passed inside an object as the second argument to the connect function inside components that need access to the Redux store.
  • has a todo list as an example project in their documentation. Feel free to use this as a reference as well.

Stretch Problem

  • Implement the ability to delete todo list items. You can create a button next to each todo list item and when it is pressed it will call an action creator that will dispatch an action that removes the specified todo list item from the todos array.
  • Use localStorage to make the data persist.
You can’t perform that action at this time.