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Angular JS

What is angular js

AngularJS is a Javascript MVC framework that was built at Google. The aim of Angular js is building complex HTML based client applications. Here we consider data first; unlike in jQuery where DOM will update data in angular js the data will be updating the DOM

Angular JS provides a way of accomplishing dominant things in an approach that eembraces and extends HTML, CSS and javascript, though shoring up some of its obtrusive deficiencies. Angular JS is a client side technology which is what HTML would have been, had it built for dynamic content.

AngularJS is a framework. It has the following features

1. Two way data binding
2. MVW pattern (MVC-ish)
3. Template
4. Custom-directive (reusable components, custom markup)
5. REST-friendly
6. Deep Linking (set up a link for any dynamic page)
7. Form Validation
8. Server Communication
9. Localization
10. Dependency injection
11. Full testing environment (both unit, e2e)

Angular js vs javascript vs jQuery vs node.js vs Ajax

JavaScript: It is a client side scripting language written for websites to run in the client’s browser.
AJAX: It is stands for Asynchronous JavaScript and XML. This will enable JavaScript to request data from a browser without refreshing the page or blocking the application.
jQuery is a JavaScript library built to automate and simplify common web tasks like AJAX or animation.
Angular is a hip JavaScript framework which is made for building large, single-page web applications.
Node.js allows JavaScript to be run without a browser, and is commonly used to run web servers.

Benefits of angular js

1. Two way data binding: Angular js included two way data binding. It works great with MVC to eliminate code when developer writing their view and model. Most of the work in moving data from one to the other just happens automatically.

2. Templates: Unlike multi page web application where HTML is created by assembling and joining it with data on server and then shipping the finished pages up to the browser. In angular js the data get shipped to the browser to be assembled there. The role of the server then becomes only to serve as static resources for the templates and to properly serve the data required by those templates. This means the developers, don’t need to write code to constantly sync the view with the model and the model with the view as in other templating systems.

3. MVC: AngularJS incorporates the basic principles behind the original MVC software design pattern into how it builds client-side web applications. This will boost the performance of an application.

4. Dependency Injection: AngularJS has a built-in dependency injection subsystem that helps the developer by making the application easier to develop, understand, and test.

5. Directives: Directives in AngularJS are used to make custom HTML essentials and simplify DOM operation. They can modify the behavior of new and existing DOM elements, by totaling custom functionality, like a datepicker or an autocomplete widget. AngularJS comes with its own set of built-in directives, as well as the capacity to add your own ones.

6. Testing: As applications cultivate in volume and complexity, it becomes unlikely to rely on manual testing to validate the accuracy of new features, catch bugs, and detect regressions. Unit tests are the first line of resistance for catching bugs, but sometimes issues come up with addition between components, which cannot be captured in a unit test. End to end tests are made to find these problems. AngularJS is written entirely from the ground up to be testable. It is comes with an end-to-end and unit test runner setup.

References

https://docs.angularjs.org/
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