FAQ: The React Redux Library - The <Provider> Component

Frequently Asked Questions React.js FAQ
1

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This community-built FAQ covers the “The Component” exercise from the lesson “The React Redux Library”.

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This exercise can be found in the following Codecademy content:

Learn Redux

FAQs on the exercise The Component

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2

In the Selectors lesson, we learn that the selectors extract only the necessary data that a component needs from the state, and we pass the state as a argument like this:

export const selectFilteredAllRecipes = (state) => {
  const allRecipes = selectAllRecipes(state);
  const searchTerm = selectSearchTerm(state);
  return allRecipes.filter((recipe) =>
    recipe.name.toLowerCase().includes(searchTerm.toLowerCase())
  );
};

To then use the selector like this:

import { useSelector } from "react-redux";
import { loadData, selectFilteredAllRecipes } from "./allRecipesSlice.js";

export const AllRecipes = () => {
  const allRecipes = useSelector(selectFilteredAllRecipes);
// etc
  );
};

It’s not clear to me by what means the selector access the state exactly? Is the state automatically passed on to the nested application when we wrap the <App /> in the <Provider /> component and pass the store as props like below?

ReactDOM.render(
  <Provider store={store}>
    <App />
  </Provider>,
  document.getElementById("root")
);
1 Like
3

I have the same question. Anybody there??

4

When you use the react-redux library and wrap your <App /> component with the <Provider /> component, the store is indeed automatically passed down to the nested components through React’s context system.

Here’s a breakdown of what happens:

  1. Creating the Store: You create a Redux store using createStore() and configure it with reducers, middleware, and any other necessary settings.
  2. Wrapping with <Provider />: When you wrap your root component (in this case, <App />) with the <Provider store={store}> component, you’re essentially connecting your Redux store to the React application. This is where the magic happens.
  3. Passing the Store: By wrapping your component tree with <Provider /> and passing the Redux store as a prop, the context API in React is used to make the store available to all components in your application.
  4. Accessing the Store: Any component that needs access to the Redux store can do so by using the connect() function from react-redux or by using the useSelector() hook. When you use connect() or useSelector(), these functions behind the scenes access the Redux store through the context API and retrieve the necessary state or dispatch functions.

So, in short, you don’t manually pass the store down to nested components like you would with regular React props. Instead, the store is made accessible throughout your component tree via the <Provider /> and the context system, and components can use connect() or useSelector() to interact with the Redux store.

Your provided code snippet demonstrates this process correctly. The <Provider store={store}> wraps around the <App /> component, and this allows any component inside <App /> to access the store using connect() or useSelector() as needed.

5

is this correct?
anybody??