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Useselector react redux7/9/2023 ![]() We’re going to use Redux toolkit to set up all the things we need to make Redux work, starting with the store.Ĭreate a new folder in the src folder called redux. We can test that our actions dispatch correctly, and that our store correctly saves the state. For example, you can test reducers in isolation since they’re just pure functions. This makes it easier for us to understand and easier to test. It would become unwieldy to pass state around and remember which component is changing the state, how it's changing the state, and so on.īy breaking things up like this, we give different responsibilities to different things, and we keep all our state in one place. Imagine an app with hundreds or even thousands of components. This causes them to re-render, displaying the new data. The store then saves this new state which is returned from the reducer and passes the state to the components. Think of it like a conveyor belt – it takes the old state and the action, does some work, and spits out the new state. It combines things together and returns the new state. The store is also in charge of updating the state based on the action and the current state which it does by using reducers.Ī reducer sounds fancy but its just a function that takes the current state from the store, and the action. Think of it like a database, in a sense that it holds all our data in one place The store receives the action, and is in charge of holding the state. For example, we can’t deposit any money without knowing the amount The payload contains data we need to know about. The type is typically just a string with the name of the action. The action contains a type, and a payload. This is where we would dispatch an action.ĭispatch is a function given to us by Redux, and lets us trigger actions. When we click a button, we usually call a function which handles this event. Let's say we have a component that lets us deposit some money with the click of a button (the "UI" box in the diagram above). Lets take an example: image from redux.js.org Redux is made up of actions, reducers, state and the store. Starter: This is the folder we'll be working in if you decide to follow along with the tutorialīefore we get into the code, let's look at the different parts of Redux and how they work together.See the readme in the GitHub repo for how to do this Note, if you run this, the API needs to be started as well. API: This is the API we'll use later in the project when we learn about working with API's in Redux (how exciting!).Next, open the react-redux-todo-app folder up in your IDE (I'll be using VS Code). This should fire up a browser with the app started. Let's start by opening a terminal and running the following commands: git clone This lets us focus more on the Redux side of things which is the reason we're all here! I've provided some starter code that gives us a basic React UI with all the components in place. Source Codeįinally, you can grab the finished code here (on GitHub). Heres a video walkthrough if you want to supplement your reading (on YouTube). This is what we'll build Yep, its a Todo List! But this one uses Redux which makes it a fancy todo list! Learn how to use Redux Toolkit to setup and work with Redux using less codeĪnd I’ll give you some challenges which you can try at the end.Learn how to fetch data from an API using Redux.Learn about the different parts of Redux and how they work together.In this Redux for Beginners guide, we're going to:
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