Book Image

React Native By Example

By : Richard Kho
Book Image

React Native By Example

By: Richard Kho

Overview of this book

React Native's ability to build performant mobile applications with JavaScript has resulted in its popularity amongst developers. Developers now have the luxury to create incredible mobile experiences that look and feel native to their platforms with the comfort of a well-known language and the popular React.js library. This book will show you how to build your own native mobile applications for the iOS and Android platforms while leveraging the finesse and simplicity of JavaScript and React. Throughout the book you will build three projects, each of increasing complexity. You will also link up with the third-party Facebook SDK, convert an app to support the Redux architecture, and learn the process involved in making your apps available for sale on the iOS App Store and Google Play. At the end of this book, you will have learned and implemented a wide breadth of core APIs and components found in the React Native framework that are necessary in creating great mobile experiences.
Table of Contents (17 chapters)
Title Page
About the Author
About the Reviewer
Customer Feedback

Making Fetch happen

The first thing we will do is make a request to a third-party API during the componentDidMount life cycle. Our intention is to grab a set of JSON data from that API and use it to populate the Picker component that we'll be creating in the next section.

The third-party API that I will be using is a nifty one that produces JSON placeholder data--

To grab data from this third-party API, we'll be using the fetch API. fetch is a JavaScript API that does not need to be specifically imported into our file. It returns a promise that contains a response. If we want to use promises, we can call fetch like this:

fetch(endpoint, object) 
  .then((response) => { 
    return response.json(); 
  .then((result) => { 
    return result; 

We can also call fetch using the async/await keywords:

async fetchAndReturnData (endpoint, object) { 
  const response = await fetch(endpoint, object);