Realtime web applications are said to include the benefits of superfast responses to the user and are highly interactive, which increases the user engagement flow. In this modern web, there are many frameworks and tools that are available to develop Realtime applications. JavaScript is one of the most popular scripting languages that is used for building applications on the web. This book introduces you to ReactJS and Firebase, which you will likely come across as you learn about modern web app development. They both are used for building fast, scalable, and realtime user interfaces that use data and can change over time without reloading the page.

React is famously known as a View in Model-View-Controller (MVC) pattern and can be used with other JavaScript libraries or frameworks in MVC. For managing the data flow in React app, we can use Flux or Redux. In this book, we will also go through how we can implement redux with React and firebase app.

Before jumping into the code, let's refresh our knowledge of ReactJS and see what we can do with Firebase and their features, to know the power of firebase.

Here is the list of topics that we'll cover in this section:

• Introduction of React
• React Component LifeCycle

This will give you a better understanding of dealing with React Components.