Book Image

React Native Cookbook - Second Edition

By : Daniel Ward
4 (1)
Book Image

React Native Cookbook - Second Edition

4 (1)
By: Daniel Ward

Overview of this book

If you are a developer looking to create mobile applications with maximized code reusability and minimized cost, React Native is what you need. With this practical guide, you’ll be able to build attractive UIs, tackle common problems in mobile development, and achieve improved performance in mobile environments. This book starts by covering the common techniques for React Native customization and helps you set up your development platforms. Over the course of the book, you’ll work through a wide variety of recipes that help you create, style, and animate your apps with built-in React Native and custom third-party components. You’ll also develop real-world browser-based authentication, build a fully functional audio player, and integrate Google Maps in your apps. This book will help you explore different strategies for working with data, including leveraging the popular Redux library and optimizing your app’s dataflow. You’ll also learn how to write native device functionality for new and existing React Native projects and how app deployment works. By the end of this book, you'll be equipped with tips and tricks to write efficient code and have the skills to build full iOS and Android applications using React Native.
Table of Contents (17 chapters)

Defining reducers

At this point, we have created a few actions for our app. As discussed earlier, actions define that something should happened, but we haven't created anything for putting the action into motion. That's where reducers come in. Reducers are functions that define how an action should affect the data in the Redux store. All accessing of data in the store happens in a reducer.

Reducers receive two parameters: state and action. The state parameter represents the global state of the app, and the action parameter is the action object being used by the reducer. Reducers return a new state parameter reflecting the changes that are associated with a given action parameter. In this recipe, we'll introduce a reducer for fetching the photos by using the actions we defined in the previous recipe.

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