All You Need To Know About Angular 2

Angular, the popular Javascript framework, is written from scratch, and has numerous improvements over its initial version. Angular 2 is the new version of the framework that we knew by the name of AngularJS, which we already talked about in the article Why AngularJS? . 

Even if it is a new version, this should not mislead us:  rather we should think that it is a different framework . Four years after its birth, it has even changed its name and is now   called  Angular 2 , without the acronym JS.

In this article, we analyze some of the new features that come with the arrival of Angular 2 , especially those that have forced its creators to start from scratch and have broken backward compatibility.

It is a different framework, since it has been rewritten and the development mode changes a lot, although it is also true that it reuses several of the mechanics to which we were already accustomed. Perhaps if you start studying Angular 2 now, without having gone through the 1.x versions, this will be indifferent to you, but those who knew the first version of Angular will see that it is almost as if they started from scratch.

Component-Based Development

We are seeing this trend in the number of successful products and it has been positively received by the community, since it allows us to break down the problems of the applications in a more granular way and isolate the responsibility of the code of each piece of an application.

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The components came to Angular in versions 1.5, but the novelty now is that their use is absolutely mandatory.

• Lazy Load. One of the most requested demands by the community regarding Angular is the possibility of delaying the loading of certain parts of the application, until it is really necessary to use them.

Due to the architecture of Angular’s dependency injector, one of its main pieces already in 1.x versions, it was very difficult to implement lazy loading. The dependency injector has now been redesigned to make Lazy Load an easy option to implement.

• Binding system. If Angular 1 was liked by thousands of developers, one of the main reasons was the double binding system. It is a utility that saves us many lines of code, but also one of the factors that caused the decrease in performance of complex applications with Angular 1.x.

The main novelty in the Angular 2 binding model is that the developer is able to decide how the flow of the binded data should be implemented, in one direction, in two, etc. This improvement puts in the hands of the developer a great tool for optimizing applications, which can be up to 5 times faster.

• Universal applications. Angular is now designed for the development of applications of all kinds. One of its main novelties is that the same framework will allow us to render the HTML on the server side, which offers us the possibility of creating isomorphic applications.

Now they like to call themselves by the term “platform” rather than “framework”, as it could be used to develop not only web applications, but also for devices, general-purpose programs, and so on.

• TypeScript.  We comment on it last, but not for that reason it is less important, and that is that Angular 2 makes use of TypeScript as a language. For those who are not aware, TypeScript is a superset of Javascript, a language that adds new possibilities to Javascript, but once compiled, the code that is produced as a result is standard Javascript.

Angular 2 is written in TypeScript and although we are not forced to use this language to develop our applications, it is a recommendation. With this, great benefits are achieved, such as the possibility that the TypeScript compiler helps us in development time, alerting us to problems in the code when we are writing it, or suggesting much more extensive and relevant completion possibilities. 

It also allows us to  work with real classes and objects , which allows us to easily apply widely used design patterns in development with more robust languages ​​and we can do  refactoring with the help of the editor itself.

In practice, with TypeScript, the frontend development experience is much more similar to that of backend development. All thanks to a strong type system and various tools such as generics, interfaces, abstract classes, etc.

In summary, Angular 2 is an excellent tool that, despite being more complex than its predecessor version, does take us to a new level in frontend development. It offers us a framework designed to respond to all the needs of developers and an architecture capable of meeting the requirements of the future.

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