If you want to learn redux from analogies, I found this super useful https://link.medium.com/OYJvQWEapwb
I won’t say library developers don’t have strong opinions on how their libraries should be used, because they certainly do. The problem is turnover and change is so rapid, these don’t have time to solidify into common practices. Only those really paying attention to monthly, weekly, daily changes in the React community could tell you the best way to use X library. We might assume that keeping the application’s state global will cause some performance penalty. For the most part, this isn’t the case, as React Redux implements a number of performance optimizations internally, so our own connected components only re-render when they actually need to. REDUCER：The Reducer reads the payload from the action and then updates the store with the state accordingly.
Debugging is easy in Redux
Ideally, the data in a component should live in just one component, so sharing data among sibling components becomes difficult. Without Redux, you would have to make data dependent on the components and pass it through different components to where it’s needed. First, we’ll review the basics of Redux and how it functions. Then we will see how using Redux can help you in your app by using a simple but practical component.
Yet, you don’t always need Redux to manage the state of your application. First, we define the initial state for the application by setting the count equal to zero. Next, we define a counterReducer function that accepts the current state and the dispatched action. As we can dispatch multiple actions to the reducer, we’ll use a switch statement to handle the different actions. Each action contains a type (also seen as an identifier) and a payload. Next, a reducer accepts the action and changes the state based on the received action type and payload.
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For example, each major feature inside your app can have its own reducer. You might assume that keeping the app’s state global would result in some performance degradation. This eliminates the need to continuously pass state from one component to another. You can also select the slice from the store for a particular component; this makes your app more optimized.