Book Image

Full-Stack Flask and React

By : Adedeji
3.5 (2)
Book Image

Full-Stack Flask and React

3.5 (2)
By: Adedeji

Overview of this book

Developing an interactive, efficient, and fast enterprise web application requires both the right approach and tooling. If you are a web developer looking for a way to tap the power of React’s reusable UI components and the simplicity of Flask for backend development to develop production-ready, scalable web apps in Python, then this book is for you. Starting with an introduction to React, a JavaScript library for building highly interactive and reusable user interfaces, you’ll progress to data modeling for the web using SQLAlchemy and PostgreSQL, and then get to grips with Restful API development. This book will aid you in identifying your app users and managing access to your web application. You’ll also explore modular architectural design for Flask-based web applications and master error-handling techniques. Before you deploy your web app on AWS, this book will show you how to integrate unit testing best practices to ensure code reliability and functionality, making your apps not only efficient and fast but also robust and dependable. By the end of this book, you’ll have acquired deep knowledge of the Flask and React technology stacks, which will help you undertake web application development with confidence.
Table of Contents (21 chapters)
1
Part 1 – Frontend Development with React
9
Part 2 – Backend Development with Flask

Using useCallback to avoid re-rendering functions

In React function components, there is an additional optimization Hook called useCallback. It shares functionality with useMemo, with a slight difference in output behavior in terms of what is returned. In useCallback, a memoized function is returned, while useMemo returns memoized returned values of the function.

Like useMemo, useCallback is invoked when one of its dependencies is updated inside the function component. This ensures that the functional components are not necessarily re-rendered constantly. There are key highlights for useCallback:

  • A memoized callback function is returned in useCallback. This improves the performance of the React application based on memoization techniques.
  • The change in the dependencies of the useCallback Hook determines whether it will update or not.

Right now, let’s dive into a simple use case of useCallback for deeper understanding.

The following snippet displays a...