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

Prop validation in React

By declaring a propTypes object for a component, I can specify the expected props and their types for a given component. This is helpful for future maintainers of our code and provides helpful warnings when props are incorrectly entered or missing.

To take advantage of prop validation, first import the PropTypes module from React:

import { PropTypes } from 'react'; 

Then, in our component, we give it a static property of propTypes:

class Example extends Component { 
  static propTypes = { 
    foo: PropTypes.string.isRequired, 
    bar: PropTypes.func, 
    baz: PropTypes.number.isRequired 

In the preceding example, foo and baz are the required props for the Example component. foo is expected to be a string, while baz is expected to be a number. bar, on the other hand, is expected to be a function but is not a required prop.