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

Deleting expenses

For users to delete expenses from any month, we need to do the following things:

  • Add a method to storageMethods to update an expenses object. It should accept the month, year, and array of expenses. Then, it should override the array of expenses for that specific month and year combination in AsyncStorage with this new array, and recalculate the amount spent.
  • Wrap a TouchabbleHighlight component around each row that, when long pressed, opens an alert that asks the user whether they wish to delete the item.
  • If the user confirms that they would like to delete the item, then we should delete it. A new array of expenses for the current month should be created without the deleted item, and it should be saved using the storageMethods function we made.
  • When an expense is deleted, we should update the current view to reflect the item being deleted and the updated spent amount.
  • If the user cancels, the alert should close and no changes should be made.

Take some time to build this feature...