Since Angular.js facilitates separation of client-side components with the help of inbuilt dependency injection (DI) management, it has testing support for every component e.g. Angular Controller, Angular Service, etc. It’s an always good idea of testing client-side components before deployment.
Angular 2 moved from dev preview to beta status in December 2015. As it is the possible successor of AngularJS, one of today's most commonly used frameworks for single page web applications, many UI and web developers take a close look at Angular 2's potentials and possibilities in these days.
Authentication for single page apps can be a tricky matter. In many cases, SPA architecture involves having an isolated front-end application with a framework like AngularJS, and a separate backend that serves as a data API to feed the front-end. In these cases, traditional session-based authentication that is done in most round-trip applications falls short. Session-based authentication has a lot of issues for this kind of architecture, but probably the biggest is that it introduces state to the API, and one of the tenets of REST is that things remains stateless. Another consideration is that if you ever want to use that same data API as a backend for a mobile application, session-based authentication won’t work.
There are two common annoyances that often happen during the initial load of a page containing an Angular app: an empty view and an API data delay. These annoyances are particularly likely on a slow mobile connection. The author of this article is here to show you what they are, and how to fix them!
The first place you’ll usually start in any Angular application or module library, is creating a module. In this article we will walk through the syntax differences between creating a module (a setter) and talking to an existing module (using a getter).