Book Image

TypeScript Design Patterns

By : Vilic Vane
Book Image

TypeScript Design Patterns

By: Vilic Vane

Overview of this book

In programming, there are several problems that occur frequently. To solve these problems, there are various repeatable solutions that are known as design patterns. Design patterns are a great way to improve the efficiency of your programs and improve your productivity. This book is a collection of the most important patterns you need to improve your applications’ performance and your productivity. The journey starts by explaining the current challenges when designing and developing an application and how you can solve these challenges by applying the correct design pattern and best practices. Each pattern is accompanied with rich examples that demonstrate the power of patterns for a range of tasks, from building an application to code testing. We’ll introduce low-level programming concepts to help you write TypeScript code, as well as work with software architecture, best practices, and design aspects.

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TypeScript Design Patterns
Vilic Vane
Aug, 2016 | 256 pages
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Table of Contents (15 chapters)
TypeScript Design Patterns
TypeScript Design Patterns
Credits
Credits
About the Author
About the Author
About the Reviewer
About the Reviewer
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Tools and Frameworks
Tools and Frameworks
Installing the prerequisites
Choosing a handy editor
Getting your hands on the workflow
Summary
2
The Challenge of Increasing Complexity
The Challenge of Increasing Complexity
Implementing the basics
Growing features
Getting things right
Summary
3
Creational Design Patterns
Creational Design Patterns
Factory method
Abstract Factory
Builder
Prototype
Singleton
Summary
4
Structural Design Patterns
Structural Design Patterns
Composite Pattern
Decorator Pattern
Adapter Pattern
Bridge Pattern
Façade Pattern
Flyweight Pattern
Proxy Pattern
Summary
5
Behavioral Design Patterns
Behavioral Design Patterns
Chain of Responsibility Pattern
Command Pattern
Memento Pattern
Iterator Pattern
Mediator Pattern
Summary
6
Behavioral Design Patterns: Continuous
Behavioral Design Patterns: Continuous
Strategy Pattern
State Pattern
Template Method Pattern
Observer Pattern
Visitor Pattern
Summary
7
Patterns and Architectures in JavaScript and TypeScript
Patterns and Architectures in JavaScript and TypeScript
Promise-based web architecture
Modularizing project
Asynchronous patterns
Summary
8
SOLID Principles
SOLID Principles
Single responsibility principle
Open-closed principle
Liskov substitution principle
Interface segregation principle
Dependency inversion principle
Summary
9
The Road to Enterprise Application
The Road to Enterprise Application
Creating an application
Building and testing projects
Version control
Continuous integration
Deployment automation
Summary

Installing the prerequisites

The contents of this chapter are expected to work on all major and up-to-date desktop operating systems, including Windows, OS X, and Linux.

As Node.js is widely used as a runtime for server applications as well as frontend build tools, we are going to make it the main playground of code in this book.

TypeScript compiler, on the other hand, is the tool that compiles TypeScript source files into plain JavaScript. It's available on multiple platforms and runtimes, and in this book we'll be using the Node.js version.

Installing Node.js

Installing Node.js should be easy enough. But there's something we could do to minimize incompatibility over time and across different environments:

  • Version: We'll be using Node.js 6 with npm 3 built-in in this book. (The major version of Node.js may increase rapidly over time, but we can expect minimum breaking changes directly related to our contents. Feel free to try a newer version if it's available.)

  • Path: If you are installing Node.js without a package manager, make sure the environment variable PATH is properly configured.

Open a console (a command prompt or terminal, depending on your operating system) and make sure Node.js as well as the built-in package manager npm is working:

$ node -v
6.x.x
    
$ npm -v
3.x.x

Installing TypeScript compiler

TypeScript compiler for Node.js is published as an npm package with command line interface. To install the compiler, we can simply use the npm install command:

$ npm install typescript -g

Option -g means a global installation, so that tsc will be available as a command. Now let's make sure the compiler works:

$ tsc -v

Version 2.x.x

Note

You may get a rough list of the options your TypeScript compiler provides with switch -h. Taking a look into these options may help you discover some useful features.

Before choosing an editor, let's print out the legendary phrase:

  1. Save the following code to file test.ts:

    function hello(name: string): void { 
        console.log(`hello, ${name}!`); 
      } 
       
      hello('world');

  2. Change the working directory of your console to the folder containing the created file, and compile it with tsc:

          $ tsc test.ts

  3. With luck, you should have the compiled JavaScript file as test.js. Execute it with Node.js to get the ceremony done:

    $ node test.js
hello, world!

Here we go, on the road to retire your CTO.

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