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This article mainly introduces "how to be a good Angular developer". In the daily operation, I believe that many people have doubts about how to become a good Angular developer. The editor has consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "how to become an excellent Angular developer"! Next, please follow the editor to study!

1. Modular Angular architecture

In theory, you can put all Angular code on one page and into one large function, but this is not recommended, nor is it an effective way to construct code and goes against the purpose for which Angular exists.

Angular treats the concept of modules as an important part of the framework architecture, which refers to a collection of code that has only one reason to exist. Your Angular app is basically made up of modules-some independent and some shared.

There are several ways to build modules in your application, and an in-depth understanding of the different architectures can also help determine how to extend the application as it grows, and it can also help isolate code and prevent code coupling.

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Angular architecture model

Scalable Angular application architecture

two。 Unidirectional data flow and immutability

As early as in Angular 1, two-way binding captured the hearts of many front-end developers. This is actually one of the initial selling points of Angular. However, over time, as the application begins to become more complex, it begins to have performance problems.

It turns out that two-way binding is not needed everywhere.

Bidirectional binding is still possible in Angular 2 +, but bidirectional binding can only be done when the developer explicitly requests it-this forces the person behind the code to consider the data direction and data flow, and it also allows the application to process the data more flexibly by determining how the data flows.

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Angular data flow * practice

Unidirectional flow in Angular

Advantages of one-way binding

3. Attribute and structural instructions

The directive is an extension of HTML through custom elements. Attribute directives allow you to change the properties of elements, and structural directives change the layout by adding or removing elements in the DOM.

For example, ngSwitch and ngIf are structural instructions because it evaluates parameters and determines whether certain parts of the DOM should exist.

Attribute-type instructions are custom behaviors that are attached to elements, components, or other instructions.

Learn how to use these two directives to extend the functionality of your application and reduce the amount of repetitive code in your project. Attribute-type instructions can also help focus on certain behaviors used in different parts of the application.

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Angular attribute type instruction

Angular structural instruction

Angular structured instruction mode

4. Component lifecycle hook

Each software has its own lifecycle that determines how something is created, rendered, and deleted. The component life cycle of Angular is as follows:

Create → render → render children → check when data-bound properties change → destroy → remove from DOM

We can seize the critical moment in this cycle and lock him in a particular moment or event. This allows us to create appropriate responses and configure behavior based on the different stages of the component's existence.

For example, you may need to load some data before rendering the page, and you can do this through ngOnInit (), or you may need to disconnect from the database, which can be done through ngOnDestroy ().

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Angular Lifecycle Hook

Component life cycle

5.Http and observable object services

This is not a feature specific to Angular, but comes from ES7. Angular just happens to implement it as part of the framework's support, and just understands this, and it can also be well converted to React, Vue, and any JavaScript-related library or framework.

Observable object services are patterns that allow you to process data efficiently-allowing you to parse, modify, and maintain data in event-based systems. You can't completely escape Http and observable objects because everything is data.

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JavaScript observable object mode

Angular HTTP and observable object

ES7 observable function

6.Smart/Dumb component architecture

When writing Angular applications, we tend to put everything into components. However, this is not a practice. The concept of Smart/Dumb components in Angular needs more discussion, especially among beginners.

Whether a component is Smart/Dumb or not determines its role in the overall planning of the application. Dumb components are usually stateless and their behavior is easy to predict and understand. So make your components Dumb as much as possible.

The Smart component is more difficult to master because it involves input and output. To make proper use of Angular's capabilities, study the Smart/Dumb component architecture, which will provide you with patterns and ways of thinking about how to deal with code and its interrelationships.

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Smart/Dumb Angular component

Stateless Dumb components

Demo component

Smart components in Angular

7. Application structure and * practice

In terms of structure and practice, CLI can only take you so far. Building an Angular application (or any general application) is like building a house. The community has been optimizing the setup process for many years to achieve the most efficient and effective applications.

Angular is no exception.

Most of the complaints about Angular by those who try to learn Angular are often due to a lack of structural knowledge; grammar is easy to use and clear. However, the structural knowledge of the application requires an understanding of the context, requirements, and how they fit together at the conceptual and practical levels. Understanding Angular's different potential application structures and their practices will give you a whole new perspective on how to build applications.

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Single repository Angular apps

Angular library, Angular package

Angular

Angular micro-application

Monolithic repository

8. Template binding syntax

Binding is the crystallization of the JavaScript framework, which is one of the primary reasons for its existence. Template binding serves as a bridge between static HTML and JavaScript, and Angular's template binding syntax acts as a facilitator between these two technologies.

Once you learn how and when to use them, it becomes much easier and less annoying to convert an once-static page into an interactive page. Study the different scenarios of binding, such as property binding, event, interpolation, and two-way binding.

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Angular property binding

Angular event binding

Angular bidirectional binding, Angular interpolation

Angular transfer constant

9. Feature modules and routin

In Angular, the capabilities of feature modules are underestimated. It is actually an excellent way to organize and respond to business needs. In the long run, it limits liability and helps prevent code contamination.

There are five types of feature modules (domain feature module, routing feature module, routing module, service feature module, and recognizable component feature module), each of which handles a specific type of function. Learning to combine feature modules with routing can help create discrete feature sets and apply good and clear separation of concerns to your application.

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Angular characteristic module

Shared feature structure in Angular

Feature module provider

Delay loading routing and feature module

10. Forms and validations (responsive forms and validators)

Forms are an inevitable part of any front-end development.

Along with the form is validation.

In Angular, there are many ways to construct intelligent, data-driven forms. The form iteration of * * is a responsive form. However, there are other options, namely, template-driven forms and custom validators.

Understanding how validators work with CSS will help speed up the workflow and turn the application into a preparation space for validation errors.

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Angular formal verification

Template driven verification

Responsive form validation

Synchronous and asynchronous validators in Angular

Built-in verifier

Angular Custom Validator

Cross-field cross validation

11. Content projection

Angular has something called content projection, which effectively passes data from the parent component to the child component. While this may sound complicated, it is actually the behavior of placing a view in a view to generate a master view.

We usually understand the superficial projection of content-when we nest child views in the parent view. However, to expand our understanding, we also need to understand how data is passed between different views. This is where understanding content projection comes in handy.

Understanding content projection can help you determine the data flow of your application and where variability occurs.

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Angular content projection

Angular parent-child view relationship

Angular view data relationship

12.onPush change detection

By default, Angular uses the default change detection policy. This means that the components will always be checked. Although there is no problem with using the default value, it can be an inefficient way to detect changes.

For small applications, the speed and performance are good. However, once the application reaches a certain size, it becomes very troublesome to run, especially in older browsers.

The onPush change detection strategy will significantly speed up the application because it relies on specific triggers rather than constantly checking to see if anything is happening.

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Angular onPush change detection

13. Path protection, preloading, delayed loading

If you have some type of login, you will need path protection. You can protect some views from unauthorized views, which is an essential requirement in many applications. Path protection acts as an interface between the router and the request route. It is up to the decision maker to decide whether a route is allowed to visit. There are many things to explore in the world of path protection-based on path decisions such as token expiration, user authentication, and path security.

Preloading and deferred loading can also enhance the user experience by speeding up the loading time of the application. It is worth noting that preloading and deferred loading not only determine whether to load a specific set of images, but also enhance the architecture of the binding and load different parts of the application that may exist in different scopes and domains.

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Angular path protection

Angular authentication mode

Angular preload and delay load module

Angular secure path mode

14. Custom Pip

Using Angular pipes makes data formatting incredibly simple. While many preconfigured and out-of-the-box pipes cover a lot of things such as dates, currencies, percentages, and character case, it doesn't cover everything you need.

This is where custom pipes come in handy. You can easily create your own filters and convert data formats according to your preferences. It's really easy, so go and have a look!

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Angular Custom Pipe

15.@viewChild and @ ContentChild modifiers

ViewChild and contentChild are the way components communicate with each other. The point of Angular is that you have multiple components that are compiled together like a jigsaw puzzle, but if these components are isolated from each other, then the puzzle won't really work much.

This is the opportunity for viewChild and contentChild to use their talents. Learn to use these two modifiers to give you access to related components. This makes the task of data sharing easier to implement and allows the transfer of data and events triggered by related components.

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Angular modifier

Viewchild and contentchild in Angular

Angular component data sharing

16. Dynamic components and ng-template

Components are the building blocks of Angular. However, not all components are fixed, and some of them need to be created dynamically rather than pre-compiled.

Dynamic components allow applications to create certain components dynamically. Static components assume that things don't change. It can be predicted by expected inputs and outputs.

However, dynamic components are rendered as needed. They become very convenient when building responses that may be listening for external sources and their updated applications or pages to take place.

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Dynamic components in Angular

Dynamic components and ng-templating

17.@Host @ Hostingbinding and exportAs

@ Host,@Hostingbinding and exportAs are Angular instruction modifiers that extend the additional parameters. They also enable you to create concise templates for export in the application for use.

If the above sounds confusing, then you should first look for the Angular instruction and its purpose. @ Host,@Hostingbinding and exportAs are features of instructions that help to make it real.

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Angular instruction mode

@ Host,@Hostingbinding and exportAs of Angular

18. Using RxJs for state management

The status of the application ultimately determines the data displayed to the user. If your state is a mess of spaghetti, chances are that your entire data structure will be made fragile by any change.

When you begin to understand how states work in Angular, you will understand how and why the data behaves.

Although Angular has its own state management system, RxJs is a method of centralizing state and related data. Data may be lost in the parent-child relationship chain. RxJs decouples by creating a centralized storage.

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Angular RxJs

Flux / Redux principle

Angular state management principles

19. Dependency injection and region

Dependency injection is usually a huge concept, so if you're not familiar with the concept, this is what you really need to look for. There are several ways to efficiently create dependency injection in Angular, mainly through constructors. This is a way to import only what you need to improve the efficiency of the application instead of loading everything.

Like "dependency injection", "region" is a unique concept of Angular. It is a way for applications to detect asynchronous tasks from beginning to end. This is important because these asynchronous tasks can change the internal state of the application, thus changing the view. The Zone facilitates the change detection process.

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Angular region

Dependency injection

Angular DI

* * *

At this point, the study on "how to be a good Angular developer" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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