Book Image

Angular 6 for Enterprise-Ready Web Applications

By : Doguhan Uluca
Book Image

Angular 6 for Enterprise-Ready Web Applications

By: Doguhan Uluca

Overview of this book

Angular 6 for Enterprise-Ready Web Applications follows a hands-on and minimalist approach demonstrating how to design and architect high quality apps. The first part of the book is about mastering the Angular platform using foundational technologies. You will use the Kanban method to focus on value delivery, communicate design ideas with mock-up tools and build great looking apps with Angular Material. You will become comfortable using CLI tools, understand reactive programming with RxJS, and deploy to the cloud using Docker. The second part of the book will introduce you to the router-first architecture, a seven-step approach to designing and developing mid-to-large line-of-business applications, along with popular recipes. You will learn how to design a solid authentication and authorization experience; explore unit testing, early integration with backend APIs using Swagger and continuous integration using CircleCI. In the concluding chapters, you will provision a highly available cloud infrastructure on AWS and then use Google Analytics to capture user behavior. By the end of this book, you will be familiar with the scope of web development using Angular, Swagger, and Docker, learning patterns and practices to be successful as an individual developer on the web or as a team in the Enterprise.
Table of Contents (14 chapters)

Null guarding in Angular

In JavaScript, the undefined and null values are a persistent issue that must be proactively dealt with every step of the way. There are multiple ways to guard against null values in Angular:

  1. Property Initialization
  2. Safe Navigation Operator ?.
  3. Null Guarding with *ngIf

Property initialization

In statically-typed languages such as Java, it is drilled into you that proper variable initialization/instantiation is the key to error free operation. So let's try that in CurrentWeatherComponent by initializing current with default values:

src/app/current-weather/current-weather.component.ts
constructor(private weatherService: WeatherService) {
this.current = {
city: '',
country: &apos...