Web Development Framework Angular

Angular is a popular JavaScript framework for building web applications. It was developed and maintained by Google, and is widely used for building single-page applications (SPAs) and mobile applications. Angular is a comprehensive framework that includes a set of libraries, tools, and features for building and deploying web applications.

One of the main advantages of Angular is its powerful template syntax, which allows developers to declaratively define the structure and behavior of their application’s user interface. Angular also has a strong focus on dependency injection, which allows for more modular and testable code. Additionally, Angular provides a rich set of built-in features and functionality, such as support for routing, forms, and HTTP communication, which can save developers time and effort when building web applications.

If you are new to Angular, it is recommended that you start by reading the official documentation and following some tutorials to get a feel for the framework. There are also many resources available online, such as video tutorials, blog posts, and online courses, that can help you learn Angular and build your own web applications.

import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'app-my-component',
  templateUrl: './my-component.component.html',
  styleUrls: ['./my-component.component.css']
})
export class MyComponent implements OnInit {

  constructor() { }

  ngOnInit() {
    // Initialization logic goes here
  }

}

Angular Building Blocks

In Angular, there are several building blocks that you will use when building web applications. These building blocks include:

• Components: Components are the fundamental units of an Angular application. They are responsible for representing a piece of the UI, and for handling user interactions and events. Components are defined by a class that contains the component’s logic, and a template that defines the component’s appearance.
• Modules: Modules in Angular are used to group related components, directives, pipes, and services together. Modules can also import functionality from other Angular modules, and export functionality for use in other parts of the application.
• Templates: Templates are used to define the structure and appearance of a component’s UI. They can contain static HTML, as well as Angular template syntax for rendering dynamic content and binding to component properties and methods.
• Services: Services in Angular are used to encapsulate reusable logic that can be shared across the application. Services can be injected into components and other services using dependency injection, which allows for more modular and testable code.
• Directives: Directives in Angular are used to extend the HTML syntax and add custom behavior to DOM elements. There are two main types of directives in Angular: structural directives, which modify the structure of the DOM, and attribute directives, which modify the appearance or behavior of an element.
• Pipes: Pipes in Angular are used to transform data in templates. They are a simple way to format and display data, such as formatting dates or currency values.

These building blocks work together to create a complete Angular application. You can learn more about each of these building blocks in the official Angular documentation.

Life Cycle Hooks

In Angular, a component goes through a lifecycle as it is created, rendered, and destroyed. Angular provides several lifecycle hooks that allow you to tap into these different phases of a component’s lifecycle and perform specific tasks.

The main lifecycle hooks in Angular are:

• ngOnChanges: This hook is called whenever there is a change to an input binding.
• ngOnInit: This hook is called after the component’s constructor and after the first ngOnChanges hook. It is a good place to put initialization logic.
• ngDoCheck: This hook is called during the change detection process, and allows you to implement your own change detection logic.
• ngAfterContentInit: This hook is called after the component’s content (i.e., its projected content) has been initialized.
• ngAfterContentChecked: This hook is called after the component’s content has been checked by the change detection mechanism.
• ngAfterViewInit: This hook is called after the component’s views (i.e., its child views) have been initialized.
• ngAfterViewChecked: This hook is called after the component’s views have been checked by the change detection mechanism.
• ngOnDestroy: This hook is called just before the component is destroyed. It is a good place to clean up any subscriptions or event handlers to prevent memory leaks.

You can use these hooks to perform tasks such as setting up subscriptions, modifying the component’s behavior based on input changes, or cleaning up resources when the component is destroyed. To use a lifecycle hook, you simply need to implement the hook method in your component class. https://angular.io/

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