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Ciclo de vida de Redux

3/22
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How is the data lifecycle in Redux?

Redux is key to state management in JavaScript applications, especially when we talk about data flow. Let's detail this cycle as a piece of data passes through this robust library. The goal is to unravel each stage so you can implement Redux with confidence and precision.

What is the role of state in an application?

The heart of Redux is state. It describes the current state of your application, hosted in the Store. It is all you need to render the graphical interface (UI) of your application. The UI is always built from this current state.

What happens when an event occurs?

Every time a user interacts with your application, say through a click, an event is generated. This event triggers an action that causes changes in the state, but in an indirect and controlled way.

What is the process to update the state?

These are the steps for the state to be updated:

  1. Event Trigger: A user performs an action, such as a click.
  2. Action and Reducer: The action generated by the event is sent to the reducer.
  3. Update Store: The reducer, which acts as a pure function, determines how the state is updated in the Store.
  4. Re-render the UI: With the new state, the UI is rendered again reflecting any changes.

What role does the reducer play?

The reducer is essential, as it defines the logic for updating the state. It does not modify the state directly, but returns a new state based on the action received. It is essential to maintain predictability in UI updates.

Is Redux unique to React?

A common misconception is to think that Redux only works with React. Although it was designed primarily for this library, Redux is framework agnostic. This means that you can integrate it with any frontend framework, including:

  • Angular
  • Vue
  • Ember.js

This flexibility allows you to use Redux in a wide variety of projects, giving you consistency in state management, regardless of the base technology.

Practical tips for handling Redux

Implementing Redux may seem complicated at first, but with these practical tips, you can manage it more effectively:

  • Divide and Conquer: Structure your code by splitting actions, reducers and the Store into separate files.
  • Test Reducers: Be sure to write tests for reducers, since they are pure functions, which makes it easier to validate their behavior.
  • Reinforce the Documentation: Keep up to date with the official Redux documentation and additional resources to resolve any doubts.

Always remember that constant practice and curiosity are your best allies to master Redux. We encourage you to deepen your knowledge and continue exploring the possibilities that this library can offer you in your projects.

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  1. state define UI
  2. en la UI el usuario dispara una acción
  3. la acción es mandada al reducer
  4. el reducer actualiza el store
  5. el store contiene al state
  6. volvemos al paso 1

3.-Ciclo de vida de Redux

  • El estado describe la condición actual de la aplicación, este estado “vive” dentro del store.
  • La vista o UI se renderiza basada en este estado y cuando un evento (como un click) pasa el estado se actualiza basado en lo que pasó. No se actualiza directamente, es “disparado” hacía el reducer que es el encargado de saber como se actualizará el estado. Luego de que el cambio pasa y el estado se actualiza la UI se re-renderiza basada en el estado.


Redux es una libreria “agnostica”, es decir, puede ser usada con cualquier capa en la UI o framework.

Actualización de la imagen:
En versiones resiente Redux incorpora middlewares para el registro de acciones, la administración de peticiones asíncronas, la gestión de errores, la autenticación, entre otros.

CICLO DE VIDA REDUX
Despacho de una acción: Un evento de UI, una respuesta de red o cualquier otra fuente despacha una acción, que es un objeto de JavaScript simple que describe el cambio a realizar.

Actualización del almacén: El almacén de Redux recibe la acción despachada y la pasa a la función reductora. El reductor calcula el nuevo estado en base al estado actual y la acción.

Actualización de los componentes: El almacén emite un evento de cambio, lo que hace que los componentes que están suscritos al almacén vuelvan a renderizarse. El nuevo estado está disponible en el almacén y puede ser utilizado por los componentes para renderizar la UI actualizada.

El usuario interactúa con la UI actualizada: El usuario interactúa con la UI actualizada, potencialmente provocando otro despacho de acción. Esto comienza el ciclo nuevamente.

Nota: Es importante recordar que el estado debe tratarse como inmutable y no modificarse directamente. Se deben crear nuevos estados para reflejar los cambios.

<https://www.repasoactivo.com/deck-38-Redux%20con%20React/1385> ![](https://static.platzi.com/media/user_upload/image-6af683ae-8907-4302-b798-35964881939c.jpg)