Angular Best Practices in 2023 To Build Web Applications

Ankur Akvaliya

CO-CTO

Published On: May 08, 2023

Developed and maintained by Google, Angular which is a complete rewrite of the AngularJS framework is designed explicitly for building dynamic programming structures. The primary base or we can say that Angular’s main building blocks are modules, components, metadata, templates, data binding, services, directives, and dependency injection.

It typically comes up with a wide spectrum of other internal platforms for designing SPAs using leading technologies like HTML, CSS, and Typescript. And as we know that TypeScript development services is a superscript of the JavaScript framework that is specifically used fordeveloping Angular apps.

By using Angular technology, we can create more compatible and robust UI applications. Because of these functionalities, Angular is still one of the most popular front-end frameworks in 2023. To make it easy, we have come up with an article that demonstrates the angular best practices that every developer needs to adapt to build robust web applications.

Key Takeaways

16 Angular Best Practices That You Need To Follow

Angular is the best framework for developing feature-rich and robust web applications for your business needs. To know more about the AngularJS frameworks, read the post on what is Angular. Now, let’s explore some of the Angular best practices that you need to follow in 2023 for designing and building robust web application development.

1. Use Angular CLI

   Angular CLI (Angular Command Line Interface) is an end-to-end and robust tool that helps you with initialization, development, maintenance, test process, and even debug Angular applications. The primary role of the Angular command line interface tool is to simplify the overall approach and fast-track schedules.

   So, when using Angular CLI for your in-house Angular apps, you must know the essential functions of Angular CLI. So, if you want to install CLI using NPM packages, you must use npm install -g @angular/cli.

   Now, let us explore some of the commands that help you deal with Angular CLI commands.

   • ng new: To create a new Angular app from scratch and can start a fully functional application right out of the box.
   • ng create:To use test shells for creating components, routes, services, and pipes with a single command.
   • ng serve: It is primarily used for an application developed locally and needs to be tested in the developing phase.
   • ng test:It runs end-to-end or local unit tests of the most common command.
   • ng lint: It plays a vital role in creating a code shine using its own lint rules.
   • ng add @angular/pwa: If you want to set up an Angular service worker.

   With the help of Angular CLI, you find it easy to initiate the website development process, and is considered to be one of the easiest ways to understand the business logic, no matter, if some other developer has worked on it. It will eventually reduce a lot of costs and boosts the time of developers.

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2. Use ES6 Functionality

   The full form of ES6 is ECMAScript 6 which allows you to deal with new syntax and angular features to make code that is more modern and clear. ES6 is continuously modernized with new functionalities and features.

   Often, there exist many ES6 features like Let and Const, Arrow Functions, and Object Literals string interpolation making JavaScript programming easier for you.

3. Maintaining Proper Angular Folder Structure

   One of the most common Angular JS best practices is maintaining files and folder structure that make the work easier for you. Let’s see angular folder structure best practices and how you need to name files and classes and how to organize the angular folder system in an Angular project.

   • File Naming

   As a part of angular folder structure best practices, you must give special attention to the file name, especially during file creation. In addition, the file names must be consistent with the same pattern in which we mention the file’s feature module first and then the type, dot separated.

   It means that you must use the same file name and same template file for your Angular app.

   Some examples of file naming are home.component.ts or home.component.html file, or auth.service.ts. You can add more descriptive names to the existing environment files by using a dash(-) to separate the words in the name: menu-admin-user.component.ts.

   Above all, the most important thing is that the file and folder names should convey their purpose.

   • Class Naming

   The proper use of the upper camel case style with the added suffix typically represents your file type in the class names. Some examples are TcHomeComponent, and AuthService.

   • Folder Structure

   Apart from the file name, maintaining the angular folder structure plays an essential role in Angular framework development. The best way to manage the folder system is depicted in the image shown below:
   

   Related Post: What is Promise in Angular

4. Make a Habit of Using Lazy Loading

   Lazy loading typically loads different modules like documents, JS, CSS, videos, images, etc. It is solely responsible for enhancing the application’s load time speed, and it is usually done by breaking it into multiple packets and loading them on request.

   Instead of using other related functions to perform a lazy load of the feature modules, lazy loading can be helpful to you while your large application loads.

   Lazy load processing will only take place when something is really used. The Angular developers working in the best AngularJS development company utilize the lazy-loading function to loadChildren instead of loading the component level in the AppRoutingModule routes configuration using Angular router module.

   Once your Angular application starts, a distinct app feature module can be lazy-loaded or loaded on demand. And is considered to be one of the Angular best practices in 2023 to follow.

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   const routes: Routes = [
     {
       path: 'profile',
       loadChildren: () => import('./modules/profile/profile.module').then(m => m.ProfileModule)
     }
   ];
   

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5. Angular Coding Practices

   One of the most common Angular best practices is that you must follow Angular code standards. This is one of the Angular services’ best practices that is an impressive way of programming web applications and mobile development.

   In Angular applications, you can follow certain Angular coding structure, standards and styles to get the best user experience.

   It becomes challenging for Angular developers to fix bugs and reflect on immediate issues, especially when dealing with complex code structures.

   Let’s explore some angular code standards, as a part of Angular guidelines, need to follow to make web application development comply with the angular coding standards guide.

   • For every file, the code must not exceed 400 lines limit.
   • For every function, the code must not exceed 75 lines.
   • You may use the custom prefix to eliminate particular container element name collisions with other Angular apps’ parent and child components and native HTML elements.
   • Make a habit of using “const” if you find only the possible values of the environment variables, Angular app is intact.
   • Property name ,file name, and method name must be in lower camel case.
   • The best option is always to leave one empty line between imports and modules like third-party and application imports and third-party modules and custom modules.
   • As in some programming languages, we shouldn’t name our interfaces with the starting capital I letter.

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6. Using “trackBy” Along With ‘ngFor’

   ‘ngFor’ allows Angular developers to quickly re-render the whole DOM tree after making any significant changes in the array. It will eventually help Angular make DOM changes specific to defined array rather than re-rendering DOM.

   Obviously, Angular re-renders is one such process that will take more loading process and typically take more time than utilizing ‘trackBy’.

   If you are using ‘ngFor’ like:

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   <ul>
    <li *ngfor= "let item of collection;"> {{item.id}} </li>
   </ul>

   So, you make any change, the entire DOM elements tree will be automatically re-rendered.

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   @component
   selector: 'my-angular-app',
   template: '
   <ul>
    <li *ngfor=let item of collection; trackBy: trackByFn"> {{item.id}} </li>
   </ul>
   <button (click)="getItems()"> Refresh Items </button>',
   })
   export class App {
   
   constructor() {
      this.collection = [{id: 1}, {id: 2}, {id: 3}];
   }
   
   getItems() {
      this.collection = this.getItemsFromServer();
   }
   
   getItemsFromServer(){
      return [{id: 1}, {id: 2}, {id: 3}, {id:4}];
   }
   trackByfn(index, item) {
      return index;
   }

7. Using Interfaces

   Interfaces play an essential role, especially when they need to create a contract for class. Moreover, it helps you to create the class to implement functions and properties declared inside the interface.

   One example is to have angular life cycle hooks in the component: class HomeComponent implements OnInit and OnDestroy in the Angular application.

   With the use of interfaces, you can easily deal with object literals. If our object is an interface type, it is obligated to implement all of the interface’s properties.

8. Single Responsibility Principle

   One of the standard Angular best practices that every developer needs to follow is not to create more than one component, service, or directive inside a single file.

   As a part of the single responsibility principle, every file in an Angular application should be solely responsible for developing a single and separate functionality. With the help of the single responsibility principle, we are keeping our files clean, readable, and maintainable.

9. Make a Habit of Using Safe Navigation Operator (?)

   On the safer side, the developers must use the safe navigation operator to access a property directly from only one object in a component’s template.

   For a null object, when you try to access a property, they will get an exception. But if they make a habit to use the save navigation (?) operator, the template will ignore the null value and will access the property once the object is not null anymore.

   Related Post: Resolver in Angular

10. Use OnPush change detection strategy

    By using the OnPush change detection process, Angular will only check for changes when the input changes, rather than every time there is a change in the application.

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    // app.component.ts
    
    @Component({
      selector: 'app-root',
      templateUrl: './app.component.html',
      changeDetection: ChangeDetectionStrategy.OnPush
    })
    export class AppComponent {
      @Input() items: Item[];
    }
    
    

11. Prevent Memory Leaks in Angular Observable

    Observable memory leaks are common in almost every programming language, framework, or Angular component libraries. And yes, Angular is no exception to that.

    Observables play a vital role to prevent memory leaks and helps in designing and building an Angular project for every business need in the Angular applications. It is solely capable to streamline the application data, but memory leak is one of the severe issues that might occur if you are not focused. It can create the worst situation in mid of development.

    Related Post: Angular Promise vs Observable

    Angular Best Practices That Developers Need to Follow To Avoid Leaks.

    • Using async pipe
    • Using take(1)
    • Using takeUntil()
    Related Post: Angular Development Tools

12. Using index.ts

    index.ts helps you to keep all related things together so that they don’t have to be bothered about the source file name. This helps reduce the size of the import statement.

    For example, we have article/index.ts as

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    export * from './article.model';
    export * from './article.config';
    export {ArticleComponent} from './article.component';
    

    You can easily import all such things directly using the source folder name.

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    import {Article, ArticleConfig} from '..article';
    

13. Build Reusable Components

    If you need to use UI in many places in the Angular application, they need to build a component out of it and use the feature.

    It will save you from a lot of trouble if there are some drastic changes in the UI. So, you need not change the UI code quality in all places. Instead, you can change the code in the component, and that is it.

    For this, you may have to use property and event bindings to pass inputs to the reusable components as a part of Angular material best practices and receive output events from all the components, respectively.

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14. Using Immutability

    Objects and arrays are the reference types in javascript. If we want to copy them into another object or an array and modify them, the best practice is to do that in an immutable way.

    By upgrading such types immutably, we are preserving the original objects and arrays and modifying only their copies. The easiest way to modify objects and arrays immutably is by using the es6 spread operator (…):

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    this.user = {
      name: 'Mike',
      age: 35,
      address: 'Text Street 134'
    }
    
    
    
    let updatedUser = {
      ...this.user,
      name: 'Mark'
    }
    

    We are copying the user object and then just overriding the name property.
    Let’s take a look at how to use the spread operator with arrays:

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    public results = [20, 22, 24];
    let newNumbers = [...this.numbers, 55, 57];
    

    Now if we remove or modify any of the numbers from the newNumbers array, the original array is going to be preserved with all of its values.

15. Implementing Lazy Loading

    Implementing a lazy loading feature is strictly recommended for you, especially when dealing with multi-modular structure applications.

    The good part of this approach is that they can quickly load resources on demand, not all at once. It will eventually help them in decreasing the startup time. Modules we are loading applications lazily as soon as a user navigates to their routes.

    Related Post: jQuery vs Angular

    Let’s show how to set up a lazy load in our module:

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    const appRoutes: Route[] = [
      { path: 'home', component: HomeComponent },
      { path: 'owner', loadChildren: "./owner/owner.module#OwnerModule" },
    ]
    

    In this code file example, the HomeComponent loads eagerly but the OwnerModule and all the smart components registered in that core module file loads in a lazy manner.

16. Try Not to Use ngIf with complex expressions

    Rather than using ngIf, one of the best Angular best practices that you must follow is adopting using ngSwitch for better performance.

Conclusion

We’ve come across the Angular best practices in terms of Angular coding and other essential parameters that make the Angular application process smooth. The Angular project framework makes it easy for you to design and build web applications.

With this comprehensive, opinionated blog on the best practices, we have covered all the major aspects and best practices that can be used by businesses in their Angular development process and reap maximum benefits from it.

In addition, there’s always scope to improve and write code as per angular coding standards and build web and mobile apps. You can unlock the full potential of Angular with Albioirx comprehensive Angular development expertise, Let’s get started!!