AngularJS was perfect in its first version and many mobile app developers have not found any need to upgrade to version two of the platform. However, there is more excitement awaiting here.
It’s been over a year since Angular pushed a new version of AngularJS into the market, yet many app development companies are reluctant to migrate to the new version. Of course, there is the entire rigmarole of coding and transition, but I'd like to put forth an argument for why it is worth making the upgrade from Angular 1.x to Angular 2...
Components and Directives – Angular 2 is entirely component-based and even the final application is a component of the platform. Components and directives have replaced controllers and scopes. Even the specification for directives has been simplified and will probably further improve.
Input/output – They are the communication channels for components and run in the browser with elements and events.
Content Projection – It is a new transclusion which is aligned with web components standard.
Dependency Injection – Angular 2 components have their own injector so you no longer have to work with a single injector for the entire application. With an improved dependency injection model, there are more opportunities for component or object-based work. The dependency injection contains:
Injector, which is a set of APIs to inject dependencies, and make dependency injection available
Binding to name the dependencies
Actual dependencies of the object which are generated so they can be injected
Benefits of Angular 2.0
Mobile Support – Though the Ionic framework has always worked well with Angular, the platform offers better mobile support with the version 2. The 1.x version compromised heavily on user experience and application performance in general. With its built-in mobile-orientation, Angular 2.0 is more geared for cross-platform mobile application development.
Service-side Rendering – Angular 2.0 has a service layer and a render layer which enables it to run comfortably on all environments including even servers and web workers.
Powerful Templates – The new template syntax can be analysed statistically and many directives have been removed. They also integrate better with web components and other elements.
Overall Structure – With faster change detection, template precompilation, view caching, and bootstrap time, the framework is extremely fast and efficient.
Angular 2 and TypeScript present opportunity for frontend object-oriented programming and the declarative nature makes it comprehensive.