What are the differences between a Reducer in Redux and Recoil?

Hey there! As a reducer supplier, I've been getting a lot of questions lately about the differences between a Reducer in Redux and Recoil. It's a hot topic, and I'm here to break it down for you in a way that's easy to understand.

Let's start with Redux. Redux is a predictable state container for JavaScript apps. It's like a big store where you keep all the important data (state) of your application. And a Reducer in Redux is a pure function that takes the current state and an action as inputs and returns a new state.

For example, let's say you have a simple todo app. The state might be an array of todo items. When you add a new todo, you dispatch an action. The Reducer then takes the current state (the array of todos) and the action (the new todo to add), and it returns a new state with the new todo added to the array.

The key thing about Redux reducers is that they are pure. That means they always return the same output for the same inputs, and they don't have any side - effects. They don't make API calls or change anything outside of the state they're working with. This makes it really easy to test and debug your application.

Now, let's talk about Recoil. Recoil is a state management library for React. It's a bit different from Redux. In Recoil, you have atoms and selectors. Atoms are like the smallest unit of state, and selectors are functions that derive new state from existing atoms or other selectors.

There isn't exactly a "reducer" in the same sense as Redux, but you can think of the functions that update atoms as similar. When an atom's value changes, it can trigger updates in other parts of your application that depend on that atom.

One of the big differences between a Redux reducer and the update mechanisms in Recoil is the way they handle state updates. In Redux, you have a single source of truth, and all state changes go through the reducer. This can be great for large - scale applications where you need to keep track of all state changes in one place.

On the other hand, Recoil allows for more localized state management. You can have multiple atoms that can be updated independently. This can make your code more modular and easier to understand, especially in smaller to medium - sized applications.

Another difference is in the way they handle performance. Redux uses a single store and a single reducer, which can sometimes lead to performance issues in large applications if not optimized properly. Recoil, with its atoms and selectors, can be more performant in certain scenarios because it can update only the parts of the application that depend on the changed state.

Let's look at some practical examples. Suppose you're building an e - commerce application. In Redux, you might have a reducer that manages the shopping cart state. Every time a user adds or removes an item from the cart, the action is dispatched to the reducer, and the state of the cart is updated.

In Recoil, you could have an atom for the shopping cart. When a user adds an item, you can directly update the atom, and any components that depend on that atom (like the cart summary) will be updated automatically.

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References

• Redux official documentation
• Recoil official documentation
• General knowledge about piping reducers in the industry