About Angular

Angular is a popular JavaScript framework developed by Google for building web applications. It is a client-side framework, which means that it runs in the browser and allows developers to create dynamic, responsive, and interactive web applications.

Angular was first released in 2010 as AngularJS, and it quickly gained popularity among developers. In 2016, Google released Angular 2, which was a complete rewrite of the framework, and it was significantly different from AngularJS. Since then, Google has released several versions of Angular, and the latest version as of September 2021 is Angular 13.

In this post, we will introduce Angular, its features, architecture, and how it works, as well as discuss some of its benefits and drawbacks. We will also provide a step-by-step guide on how to build a simple Angular application.

What is Angular?

Angular is a framework for building client-side web applications. It is built on top of TypeScript, which is a superset of JavaScript, and it provides developers with a set of tools and techniques for building complex and scalable applications.

Angular provides a powerful set of features for building modern web applications, including:

Component-based architecture: Angular is based on a component-based architecture, which means that each part of an application is represented as a component. This makes it easy to break down an application into smaller, reusable pieces of code.

Two-way data binding: Angular provides two-way data binding, which allows changes in the user interface to automatically update the underlying data model and vice versa.

Dependency injection: Angular provides a built-in dependency injection system that makes it easy to manage dependencies and create modular code.

Routing: Angular provides a powerful routing system that allows developers to create single-page applications (SPAs) with multiple views.

Forms: Angular provides a set of tools for building forms, including template-driven forms and reactive forms.

Testing: Angular provides a comprehensive set of tools for testing, including unit testing and end-to-end testing.

Angular Architecture

Angular is based on a component-based architecture, which means that each part of an application is represented as a component. A component is a self-contained unit of code that encapsulates the functionality and behavior of a particular part of an application.

Each component has a template that defines its view, which is the HTML that is displayed in the browser. The template can include directives, which are special instructions that modify the behavior of HTML elements.

Components can also have a class that defines its behavior, which is written in TypeScript. The class contains the logic and state of the component, and it can be used to interact with other components and services.

Angular also provides a built-in dependency injection system, which makes it easy to manage dependencies and create modular code. Dependencies are injected into a component's constructor, and they can be either services or other components.

How does Angular work?

Angular applications are built using a combination of HTML, CSS, and TypeScript. The HTML and CSS define the user interface, and the TypeScript provides the logic and behavior.

When an Angular application is loaded in the browser, the main module of the application is loaded first. This module contains the bootstrap component, which is the root component of the application.

The bootstrap component is responsible for loading all the other components in the application, as well as initializing any services that are needed.

Once the bootstrap component is loaded, Angular begins the process of compiling the application. During this process, Angular analyzes the component templates and generates JavaScript code that is used to render the application in the browser.

Once the application is compiled, Angular starts the change detection process. This process compares the current state of the application to its previous state and updates the DOM as needed.