When Angular 1 came six years ago, developers began building single-page applications which included interactive features that offered a real-time experience. The most popular products that were built from scratch with Angular are YouTube for PS3, weather.com, freelancer.com, Netflix, Tinder and many more. These dynamic web apps should have been static, but thanks to Angular, which allowed developers to use HTML as the template language, then extend its syntax, the application’s components were expressed clearly. Instead of writing code, Angular has simplified the development of the web app, as everything happens within the browser, because the code is eliminated with data binding and dependency injection.
By de-emphasizing explicit DOM manipulation, Angular improves app’s testability and performance. As for the design goals, according to Wikipedia, they include: decoupling DOM manipulation from application logic; decoupling the client side of an application from the server side; and providing structure for the journey of building an application. The MVC pattern is implemented to separate presentation, data, and logic components, and server-side services are brought to client-side web applications using dependency injection.
Angular 1’s core features are: Data-binding, Scope, Controller, Services, Filters, Directives, Templates, Routing, Model View Whatever, Deep Linking and Dependency Injection.
Related blog: AngularJS and Ionic for App Development: The Ultimate Combination
Differences Between Angular 1 and Angular 2
The changes that were made to Angular 2, which was rewritten, not upgraded, include: Mobile development, Modularity and Modern browsers only. Also, Google recommend developers to use Microsoft’s TypeScript language, which also brought improvements such as: Class-based Object Oriented Programming, Static Typing, Generics and Lambdas. TypeScript is a superset of ECMAScript 6, and the new version of Angular has adopted some of ES6’s features: Iterators, For/Of loops, Python-style generators and Reflection.
Angular 2’s other new features include Dynamic loading, Asynchronous template compilation, Simpler Routing, Diary.js logging and reactive programming support using RxJS. Google has also improved dependency injection, allowing developers to name dependencies, while controllers and $scope can be replaced with components and directives.
Why You Should Build Apps With Angular 2?
- The testability of the code will be improved by decoupling DOM manipulation from app logic
- The client side will be decoupled from the server side, so development work will progress in parallel
- You won’t need to programmatically manipulate the DOM
- The code will not describe the implementation details, but only the overall flow of the application
- Angular will auto-inject services into the application and you will be able to develop features quickly. Google promises that you will get full control over the initialization process in automated tests
Angular 2’s Weaknesses
Developers have different coding styles and until they get used to Angular 2, they will struggle a little to understand how to integrate different components. You will really need to learn the code, to be ready to master the application and evolve the project over time, but at the same time, you mustn’t make the app too complex, with big data grids and lists, because if you’ll have over 2000 watchers, they will experience a UI lag.