Monday, 14 August 2017

Angular 2 - Overview

Angular JS is an open source framework built over JavaScript. It was built by the developers at Google. This framework was used to overcome obstacles encountered while working with Single Page applications. Also, testing was considered as a key aspect while building the framework. It was ensured that the framework could be easily tested. The initial release of the framework was in October 2010.

Features of Angular 2

Following are the key features of Angular 2 −
  • Components − The earlier version of Angular had a focus of Controllers but now has changed the focus to having components over controllers. Components help to build the applications into many modules. This helps in better maintaining the application over a period of time.
  • TypeScript − The newer version of Angular is based on TypeScript. This is a superset of JavaScript and is maintained by Microsoft.
  • Services − Services are a set of code that can be shared by different components of an application. So for example if you had a data component that picked data from a database, you could have it as a shared service that could be used across multiple applications.
In addition, Angular 2 has better event-handling capabilities, powerful templates, and better support for mobile devices.

Components of Angular 2

Angular 2 has the following components −
  • Modules − This is used to break up the application into logical pieces of code. Each piece of code or module is designed to perform a single task.
  • Component − This can be used to bring the modules together.
  • Templates − This is used to define the views of an Angular JS application.
  • Metadata − This can be used to add more data to an Angular JS class.
  • Service − This is used to create components which can be shared across the entire application.

Reasons to use Angular 2

I would suggest to start with Angular 2.x (Current stable version version 2.4).
Angular 2 has improved lot in terms of design and speed. Only it is very different from Angular 1 and will have more learning curve. Angular 2 is released in October 16. So it is more stable now. Angular 4 is released in March 17. Each 6 months, they will be releasing new version. (I read as Angular 5 in Oct 17 and Angular 6 in Mar 18, But not sure about this.)
  1. Speed - Angular 2 is 5x to 10x faster than Angular 1
  2. Mobile Support - It is good to have mobile support. Angular 1 don't have support
  3. Routing - Routing improved. It is good for SEO.
  4. Testing and Debugging - This is good in Angular 2 and good while development
  5. Templating - Templating is good and managed well in Angular 2.
  6. Documentation - Doc is maintained good and complicated concepts from Angular 1 are no longer exists. Huge community is there to help in Angular 2.
  7. Cost to Upgrade - Angular 2 is completely rewritten so we can not upgrade from Angular 1 to Angular 2 easily. Project will need to write from scratch if want to upgrade. As most of the concepts are deprecated and rewritten.
  8. New versions - Angular 2 can be easily upgraded to Angular 4 by some find-replaces and additions. Angular 4 have not much changes than Angular 2. New versions (A5, A6) will not have drastic changes in design than Angular 2 and can be easily upgraded.
We will discuss all these components in detail in the subsequent post.


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