#Redux useselector code

The second is the glue code written by connect ( ), it glues redux and our inner component together through the use of a Higher Order Component. The first being what we will call the inner component, this component on its own is unaware that redux even exists. When making use of the connect ( ) our component code is separated into two parts. When 'Very Separated' we have small pieces of code and it's a nightmare to figure out how they all work together. This can seem ironic because React hooks are a tool to help with separation and code reuse, but in react-redux they do couple redux to our components more than connect ( ). Redux hooks such as useSelector ( ) reduce separation because the components include the redux glue code. When 'Not Separated' we have large files where it's hard to reuse any one piece. There's a spectrum of Separation where maintainability becomes a problem at the extreme ends. When following the Separation of concerns principle your code becomes easier to test and reuse. It becomes clear how organized your code is by its concerns when writing tests for it. To connect with me, follow me on Twitter, where I spend most of my time engaging in coding and web development-related discussions.Better performance optimizations by defaultĪ lens we can use to understand the differences between hooks and the connect ( ) is unit tests: How they differ for each and in-turn what direction of code style they nudge you towards. I hope it gives you a basic understanding of Redux so you can start making something with it on your own. But if you know 50% of it, you're like a Superman.Īt the end of it all, this is what you'll have: So, in the counter reducer, I will put in the following snippet of code: const counterReducer = (state = 1, action) => from 'react-redux' Ĭonst counter = useSelector((state) => unter) Ĭonst auth = useSelector((state) => th)

In this example, I will be going with switch. A lot of people typically create the reducer with a switch statement, but it is also possible to use an if statement. In the reducers folder, I create a file named counterReducer.js. I like to create both of them in an actions and reducers folder, then I put them in a folder I name Redux for clarity.

#Redux useselector update

Reducers, on the other hand, check which action is performed and update the state based on the action. Actions are what the name implies – they are objects that determine what will be done. Next, we need to create the actions and reducers. Redux is stand-alone and react-redux gives us access to several hooks that make life easier.

#Redux useselector how to

How to Set Up the Projectįirst of all, you need to install the redux and react-redux packages from NPM by running the command npm i redux react-redux. In this article, I teach you how to make a counter application with Redux in a React app, so you'll have enough basic knowledge to start using Redux in your projects. This gives you the ability to bring it in anywhere you need it. In a React app, the major problem Redux solves is that, instead of managing the state of the app by passing down props (which is unidirectional) the entire state is saved in a globalized store. There are walkarounds you can use in React, for example, like prop drilling and context, while Vue JS has VueX and Angular has NGRX. And it's true – using Redux in small applications is like shooting an ant with a cannon. Redux is also often criticized because it has so much boilerplate to manage application state. It might take you a while to get used to it and you might end up checking your previous projects to figure out how to get things done. Redux can really be intimidating at first. Developers commonly use it with React through the react-redux package, but it can also stand alone – so you can use it in any front end framework or library, including Vanilla JavaScript. Redux is a state management library for front end applications.