Angular Best Practices To Build Clean and Performant Web Applications in 2022

 

Published On:

  September 27, 2022
Read Time 16.99 Minute Read
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Angular Best Practices To Build Clean and Performant Web Applications in 2022

Developed and maintained by Google, Angular which is a complete rewrite of the AngularJS framework is designed explicitly to build dynamic programming structures. The primary base or we can say that Angular’s 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 single-page applications using leading technologies like HTML, CSS, and Typescript. And as we know that Typescript is a superscript of the JavaScript framework that is specifically used for developing Angular applications.

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 2022. 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.

14 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 Angular framework, read the article on what is Angular. Now, let’s explore some of the best Angular best practices that every developer needs to follow in 2022 for designing and building robust web application development.

    1. Angular CLI

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

      So, when using CLI for your in-house Angular applications, 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 application from scratch and can start a fully functional application right out of the box.
      • ng create: To use test shells for creating new components, routes, services, and pipes with a single command.
      • ng serve: It is primarily used for an application that is developed locally and needs to be tested in the developing phase.
      • ng test: It is used to run local unit tests or end-to-end testing of the most common command.
      • ng lint: It plays a vital role in creating a code shine.
      • 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 app development process and is considered to be one of the easiest ways to understand the code, 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 Folder Structure

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

      • File Naming

      You must give special attention to the file name, especially during the file creation process. In addition, the names must be consistent with the same pattern in which we mention the file’s feature first and then the type, dot separated.

      Some examples of file naming are home.component.ts or home.component.html, or auth.service.ts. You can add more descriptive names to the 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. Some examples are TcHomeComponent, and AuthService.

      • Folder Structure

      Apart from the file name, maintaining the folder structure plays a vital role in Angular development. The best way to manage the folder structure is depicted in the image shown below:
      Folder Structure for Angular Best Practices

    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 modules, lazy loading can be helpful to you while loading a large application.

      Lazy loading 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 in the AppRoutingModule routes configuration.

      Once your Angular application starts, a distinct app feature can be lazy-loaded or loaded on demand. And is considered to be one of the best Angular practices 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 coding standards. It is an impressive way of programming web applications. In Angular applications, you can follow certain coding 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 standard Angular style 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 element name collisions with other apps’ components and native HTML elements.
      • Make a habit of using “const” if you find the values of the variables are intact.
      • Property 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.
    6. Using “trackBy” Along With ‘ngFor’

      ‘ngFor’ allows Angular developers to quickly re-render the entire 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, re-rendering 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, once the developer make any change, the entire DOM 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.

      Every file in an Angular application should be solely responsible for developing a single functionality. By doing this, we are keeping our files clean, readable, and maintainable.

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

      On the safer side, the Angular developers must use the safe navigation operator to access a property directly from an 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.

    10. Prevent Memory Leaks in Angular Observable

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

      Observables play a vital role in designing and building a web application for every business need in Angular application. It is solely responsible for streamlining 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.

      Here’re some of the tips that Angular developers need to follow to avoid leaks.

      • Using async pipe
      • Using take(1)
      • Using takeUntil()
    11. 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';
      
    12. 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 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 components and receive output events from the components, respectively.

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    13. 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 modifying reference 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.

    14. Implementing Lazy Loading

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

      The good part of the Lazy Loading 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.

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

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

      In this code example, the HomeComponent is loading eagerly but the OwnerModule and all the components registered in that module are loading in a lazy manner.

    Conclusion

    We’ve come across the Angular best practices in terms of coding and other essential parameters that make the Angular application process smooth. The Angular framework makes it easy for you to design and build web applications. In addition, there’s always scope to improve the way we write code and build apps.

    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 development process and reap maximum benefits from it.

    Ankur Akvaliya is Sr. Software Engineer at Albiorix Technology. He is a dedicated and hard-working person to deals with any technological needs. He is prominent in working with object-oriented design, problem resolution, requirement gathering, and finally debugging the code. Above all, his keen interest is in writing the technical articles that can become a boon for readers.

Frequently Asked Questions

How do you write good Angular code?

One of the standard Angular practice that every developer
need to adopt, includes:

  • Eliminating much use of modifying reference types
  • Keeping well-organized code
  • Making use of Interfaces to keep the flexible and scalable design
  • Making proper usage of Constructor vs. OnInit
  • Avoiding duplicate API calls
  • Closeout subscriptions
  • Avoid nested subscriptions
  • Avoid business logic in templates
What is the best way to improve the performance of Angular application?
  • Using AoT compilation
  • Using OnPush change detection strategy
  • Using pure pipes.
  • Unsubscribe from Observables.
  • Lazy Loading
  • Use trackBy option for For Loop
  • Avoid computation in template files
  • Usage of web workers
How will integrate API in the Angular app best practices?
  • Use Angular CLI
  • Maintain proper folder structure
  • Follow consistent Angular code standards and styles
  • Typescript
  • Use ES6 Features
  • Use trackBy along with ngFor
  • Break down into small reusable components
  • Use Lazy Loading

Ankur Akvaliya

Ankur Akvaliya is Sr. Software Engineer at Albiorix Technology. He is a dedicated and hard-working person to deals with any technological needs. He is prominent in working with object-oriented design, problem resolution, requirement gathering, and finally debugging the code. Above all, his keen interest is in writing the technical articles that can become a boon for readers.

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