Differences between Angularjs and AngularDart.

What is AngularDart?

AngularDart is a client-side framework for creating structured web applications in Dart. AngularDart is somewhat similar to AngularJS but it differs in implementation, takes advantage of dart features such as classes and annotation.

Features :

1. Components can be reused
2. Data Binding feature
3. Deep linking
4. Form validation
5. Dependency Injection
6. Testable

Dart Version of AngularJS Framework By Google

Google Team has come up with a Dart version of AngularJs framework, which is also known as AngularDart. Now Angular 2 codebase is divided into two i.e., the Dart version in which codebase is written directly in the Dart and TypeScript/JavaScript version. AngularDart is heavily inspired by AngularJS and features of core Angular such as Data binding and Dependency Injection are all present here. AngularDart is built on web standards such as Shadow DOM and this is great news for developers because:

1. The framework feels more like an idiomatic Dart.
2. It makes use of Dart features that couldn't work with the TypeScript flavor.
3. It is very fast as compared to AngularJS.

AngularDart VS AngularJS

1. AngularJS is written in Javascript and AngularDart is written in Dart.
2. The expression language is supported by both versions.
3. The parser used in the AngularDart is a direct port of AngularJS and the difference between the two is that AngularDart supports multiple backends.
4. The Dependency Injection (DI) system is different in both. The Dart is class-based and Javascript is symbol-based.
5. The compiler used in AngularDart is completely rewritten, which means that directives behave differently and there is a  difference between ‘structural’ and ‘decorative’ directives.
6. In AngularDart, link/compile functions are replaced with an apply function.
7. The attribute maps concept is available on AngularDart and not on AngularJS.

Developers Opted for AngularDart

AngularDart is faster than AngularJS. It’s great news for JS developers as well. Elimination of Dart-related code from Angular Base code makes javascript/TypeScript version considerably smaller with good performance.

For developers, this doesn’t have many changes about how you use API’s, it fixes issues faster. Same template syntax and same API will be shared by both the versions and you will have the freedom to submit pull requests in the language that you know best, and changes can be made and reviewed without the burden of compilation and cross-compatibility with downstream languages.

Angular Dart source code is cleaner and more Dart-y, for Dart developers. With a dedicated team of Dart experts, developers will be able to resolve issues more quickly and finally update all of the documentation with a Dart focus. Developers will be able to use many Dart-specific features that weren’t compatible with the Typescript flavor.

Typescript or JavaScript developers will get benefit from cleaner JavaScript APIs and performance gains as the Typescript codebase has been simplified to eliminate the need for compilation to Dart.

The AngularDart was designed not just to be a programming language, but also for a set of stable libraries, solid tools and a great framework.

 AngularDart Code Execution:

Here we have taken a sample code and executed it in DartPad. Small “Welcome to AngularDart” code we have executed, let’s check out how it works:

Step 1: Write a main method which returns no value. Hence, it should be made “void”. We have declared the local variable as “index” which picks up the value using querySelector (finds the first descendant element that matches the specific group of selectors).

import ‘dart:html’ is the most important thing and before proceeding to work with AngularDart it is required to import the required library.

Step 2: Coming to the HTML part, we have called the index value using id as the parameter.

Step 3: The output can be viewed both in HTML and console. We can see the effect in the output screen after executing the code.

We have executed the AngularDart code and here we can see the loop has executed 4 times and printed “Welcome to Angulardart 3!” giving the index value as 3.