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Advanced TypeScript Programming Projects
Advanced TypeScript Programming Projects

Advanced TypeScript Programming Projects: Build 9 different apps with TypeScript 3 and JavaScript frameworks such as Angular, React, and Vue

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Advanced TypeScript Programming Projects

Creating a Markdown Editor with TypeScript

It is hard to deal with content on the internet without encountering markdown. Markdown is a simplified way to create content using plain text that is easily converted into simple HTML. In this chapter, we are going to investigate what it takes to create a parser that will convert a subset of the markup format into HTML content. We will automatically convert relevant tags into the first three header levels, the horizontal rule, and paragraphs.

By the end of this chapter, we will have covered how to create a simple Bootstrap web page and reference the JavaScript generated from our TypeScript, as well as hooking up to a simple event handler. We will also cover how to create classes using simple design patterns and how to design classes with single responsibilities, which are techniques that serve us well as professional developers.

The...

Technical requirements

Understanding the project overview

Now that we have a grasp of some of the concepts that we are going to cover throughout the rest of this book, we are going to start putting them into practice by creating a project that parses a very simple markdown format while the user types into a text area and displays the resulting web page alongside it. Unlike full markdown parsers, we are going to concentrate on formatting the first three header types, the horizontal rule, and paragraphs. The markup is restricted to breaking lines down by newline characters and looking at the start of a line. It then determines whether or not a particular tag is present and, if not, it assumes the current line is a paragraph. The reason we have chosen this implementation is because it is a simple task to pick up immediately. While it is simple, it offers sufficient depth to show that we are going to tackle...

Getting started with a simple HTML project

This project is a simple HTML and TypeScript file combination. Create a directory to hold the HTML and TypeScript files. Our JavaScript will reside in a script folder under this directory. The following tsconfig.json file is used:

{
"compilerOptions": {
"target": "ES2015",
"module": "commonjs",
"sourceMap": true,
"outDir": "./script",
"strict": true,
"strictNullChecks": true,
"strictFunctionTypes": true,
"noImplicitThis": true,
"alwaysStrict": true,
"noImplicitReturns": true,
"noFallthroughCasesInSwitch": true,
"esModuleInterop": true,
"experimentalDecorators": true,
}
}

Writing a simple markdown parser

When I was thinking about the project that we are going to tackle in this chapter, I had a clear objective in mind. While we are writing this code, we are going to try out things such as patterns and good object-oriented (OO) practices, such as classes having a single responsibility. If we can apply these techniques right from the start, we will soon get into the habit of using them and this will translate into useful development skills.

As professional developers, before we write any code, we should gather the requirements that we are going to use and ensure that we are making no assumptions about what our application will do. We may think that we know what we want our application to do, but if we make a list of our requirements, we'll make sure that we understand everything that we are meant to deliver and we'll come up with a handy...

Summary

In this chapter, we have built an application that responded to what the user was typing into a text area, and updated a label with converted text. The conversion of this text was handled by classes, each of which had a single responsibility. The reason we concentrated on producing classes that only did one thing was to learn, right from the start, how to use industry best practices to make our code cleaner and less prone to errors, since a well-designed class that only does one thing is less likely to have problems than classes that do lots of different things.

We introduced the visitor and chain-of-responsibility patterns in order to see how we could separate the text processing into deciding whether a line contained markdown and adding the appropriate HTML-encoded text. We started introducing patterns because patterns occur in so many different software development...

Questions

  1. The application currently only reacts to the user changing the content using the keyboard. It is possible that the user could use the context menu to paste the text in. Enhance the HtmlHandler method to cope with the user pasting text in.
  2. We added H1 to H3 support. HTML also supports H4, H5, and H6. Add support for these tags.
  3. In the CanHandle code, we are calling the Visitable code. Change the base Handler class so that it calls the Accept method.

Further reading

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Key benefits

  • Apply the cutting-edge features of TypeScript 3.0 to build high-performance, maintainable applications
  • Learn through practical examples of using TypeScript with popular frameworks, such as Angular and React
  • Focus on building high-quality applications that are modular, scalable and adaptable

Description

With the demand for ever more complex websites, the need to write robust, standard-compliant JavaScript has never been greater. TypeScript is modern JavaScript with the support of a first-class type system, which makes it simpler to write complex web systems. With this book, you’ll explore core concepts and learn by building a series of websites and TypeScript apps. You’ll start with an introduction to TypeScript features that are often overlooked in other books, before moving on to creating a simple markdown parser. You’ll then explore React and get up to speed with creating a client-side contacts manager. Next, the book will help you discover the Angular framework and use the MEAN stack to create a photo gallery. Later sections will assist you in creating a GraphQL Angular Todo app and then writing a Socket.IO chatroom. The book will also lead you through developing your final Angular project which is a mapping app. As you progress, you’ll gain insights into React with Docker and microservices. You’ll even focus on how to build an image classification program with machine learning using TensorFlow. Finally, you’ll learn to combine TypeScript and C# to create an ASP.NET Core-based music library app. By the end of this book, you’ll be able to confidently use TypeScript 3.0 and different JavaScript frameworks to build high-quality apps.

Who is this book for?

This book is for programmers and web developers who are familiar with TypeScript and want to put their knowledge to work by building real-world complex applications. Prior experience with any other web framework is not required.

What you will learn

  • Discover how to use TypeScript to write code using common patterns
  • Get to grips with using popular frameworks and libraries with TypeScript
  • Leverage the power of both server and client using TypeScript
  • Learn how to apply exciting new paradigms such as GraphQL and TensorFlow
  • Use popular cloud-based authenticated services
  • Combine TypeScript with C# to create ASP.NET Core applications
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Length: 416 pages
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Table of Contents

12 Chapters
Advanced TypeScript Features Chevron down icon Chevron up icon
Creating a Markdown Editor with TypeScript Chevron down icon Chevron up icon
A React Bootstrap Personal Contacts Manager Chevron down icon Chevron up icon
The MEAN Stack - Building a Photo Gallery Chevron down icon Chevron up icon
Angular ToDo App with GraphQL and Apollo Chevron down icon Chevron up icon
Building a Chat Room Application Using Socket.IO Chevron down icon Chevron up icon
Angular Cloud-Based Mapping with Firebase Chevron down icon Chevron up icon
Building a CRM Using React and Microservices Chevron down icon Chevron up icon
Image Recognition with Vue.js and TensorFlow.js Chevron down icon Chevron up icon
Building an ASP.NET Core Music Library Chevron down icon Chevron up icon
Assessments Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

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NNNVVV Dec 13, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I've been developing software for over 20 years using a mixture of languages and technologies and recently have started to migrate more into the web development sphere away from mainly desktop/server.Having a solid background in software engineering and modern programming languages it was great to find a book targeted at my level. Anyone who has written C++, C#, (other OO languages) will find Typescript pretty straightforward but it's great to get a more in-depth look at what is supported.Whilst beginners would learn some valuable lessons from this book it's aimed at more experienced developers. I found the detailed process of developing each project from first principles refreshing and a good reminder that for successful outcomes you need solid requirements.Where some recent books I've read around the subject seem to focus on cramming as many features and buzzwords into as little space as possible, this book picks the tools you'll need to develop a whole range of applications and provides in-depth working examples of how to use them.Typescript will continue to evolve and push into new arenas of development and with this book I hope I'll have the solid foundations to keep up to date.
Amazon Verified review Amazon
Christian Graus Nov 23, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
The author clearly knows his stuff, the materials are set out logically and in a way that builds knowledge over time. The practical examples in a number of popular frameworks mean there's real world examples, no matter what you use, and I definitely walked away knowing a lot more about Typescript than I did at the start, despite being a professional developer who uses Typescript every day
Amazon Verified review Amazon
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