💡 state refers to the object that holds the application data that is shared between components. There is a central store that holds the entire state of the application. Each component can access the stored state without having to send down props from one component to another. State management is essentially a way to facilitate communication and sharing of data across components. It creates a tangible data structure to represent the state of your app that you can read from and write to. That way, you can see otherwise invisible states while you’re working with them.
While it’s mostly used as a state management tool with React, you can use it with any other JavaScript framework or library. It’s lightweight at 2KB (including dependencies), so you don’t have to worry about it making your application’s asset size bigger. The new version of Context API is a dependency injection mechanism that allows passing data through the component tree without having to pass props down manually at every level. Also, you can avoid using Redux if your data comes from a single data source per view.
Why should we use Redux?
Store is the object that holds the application state and provides a few helper methods to access the state, dispatch actions and register listeners. To summarize it, Redux maintains the state of an entire application in a single immutable state tree (object), which can’t be changed directly. When something changes, a new object is created (using actions and reducers). For simple projects, such as you would do as a beginner – for example a TODO list – there isn’t a lot of state. It is absolutely sufficient to use React’s built in state management tools, and leave out Redux.
Hopefully, this article has helped you understand that Redux is not always necessary with React. This is especially true if you are still learning and experimenting with React or your UI is small and uncomplicated. why redux When an action is fired, something must happen, the state of the application must change. In Redux, the whole state of the application is represented by one JavaScript object, called State or State Tree.
When Should You Use Redux?
Similarly, when a user deletes a task, it triggers a «delete task» action. The index.js file represents the root reducer, which combines all the individual reducers in the application. In contrast, the taskReducer.js file is one of the individual reducers that will be combined in the root reducer. In Redux, dispatch is a function provided by the store that allows you to send an action to update the state of your application.
- We’re teaching beginners and trying to help them find their first development job and we only have 3 months which is not a lot of time.
- A pure function returns the same output for the same input.
- Whenever an action is dispatched, all the reducers are activated.
- With only one source of truth present (the store), you’ve got little problems with syncing your current state with actions and other parts of the application.
To create the actions, create a new folder called «actions» in the src directory and then create a new file called index.js. This file will contain all of the action creators for our application. The switch statement inside the reducer handles different cases based on the «type» of the action. For example, if the action type is ADD_TASK, the reducer returns a new state object with a new task added to the tasks array. And if the action type is DELETE_TASK, the reducer returns a new state object with the current tasks filtered to remove the task with the specified id.