Book Image

Kotlin Blueprints

By : Ashish Belagali, Akshay Chordiya, Hardik Trivedi
Book Image

Kotlin Blueprints

By: Ashish Belagali, Akshay Chordiya, Hardik Trivedi

Overview of this book

Kotlin is a powerful language that has applications in a wide variety of fields. It is a concise, safe, interoperable, and tool-friendly language. The Android team has also announced first-class support for Kotlin, which is an added boost to the language. Kotlin’s growth is fueled through carefully designed business and technology benefits. The collection of projects demonstrates the versatility of the language and enables you to build standalone applications on your own. You’ll build comprehensive applications using the various features of Kotlin. Scale, performance, and high availability lie at the heart of the projects, and the lessons learned throughout this book. You’ll learn how to build a social media aggregator app that will help you efficiently track various feeds, develop a geospatial webservice with Kotlin and Spring Boot, build responsive web applications with Kotlin, build a REST API for a news feed reader, and build a server-side chat application with Kotlin. It also covers the various libraries and frameworks used in the projects. Through the course of building applications, you’ll not only get to grips with the various features of Kotlin, but you’ll also discover how to design and prototype professional-grade applications.
Table of Contents (16 chapters)
Title Page
About the Authors
About the Reviewer
Customer Feedback

Creating a chat application

In the previous section, we saw how we can configure Kotlin so that it can be used with Node.js. We also created our first Node.js app using Kotlin. Now, it's time to take a deep dive into Kotlin and build a bigger app. Our chat app will have following functionalities:

  • User can log in by entering their nickname
  • User can see the list of online users
  • User will get notified when a new user joins
  • User can receive chats from anyone
  • User can perform a group chat in a chat room
  • User will receive a notification when any user leaves the chat

To visualize the app we will be developing, take a look at the following screenshots.

The following screenshot is a page where the user will enter a nickname and gain an entry in our chat app:

In the following screen, you can see a chat window and a list of online users:

We have slightly configured this application in a different way. We have kept the backend code module and frontend code module separate using the following method:

  1. Create a...