As we know angular is an open-source JavaScript framework designed for building front-end applications. Angular is not just a framework but an entire platform packed with features that make front-end web and mobile development more manageable. Angular is like other modern JavaScript libraries, such as React and Vue.js, and uses many shared concepts. While React is more popular among web developers worldwide, Angular is suitable for enterprise apps.
So there are some of the best practices that developers should follow when building Angular applications.
- Use Angular CLI: The primary thing that you should consider when developing your web application is development tooling. These days, we have modern tools that make front-end web development more straightforward. For Angular, we have many tools, most importantly, the official Angular CLI and Nx, a smart and extensible build framework.you can create an Angular project without using the official CLI, this is only useful for learning purposes. For real-world development, you should use Angular CLI. Angular CLI is a command line interface. It becomes very easy to develop the angular application without configuring build tools like Webpack. Make sure to use Angular CLI to generate your project since it comes with the best practices recommended by the team, or even use Nx if you are building full-stack applications.Before installing Angular CLI, you must have a recent version of Node.js and npm installed.You can use the below command to install the angular CLI-
npm install -g @angular/cli
- Use a Scalable and Maintainable Project Structure: It is not a easy task to find the convenient project structure or architecture. it gets easier as you get more experience building both small and large apps. For a small application, the default structure generated by Angular CLI is okay. Still, once your project grows, you’ll find it difficult to maintain and scale your app correctly. So it is a good practice to architecting your app with a core module, shared module, and feature module for each feature of your application (plus the root application module, which bootstraps the app). You then move the imports in the app module to the core module and leave the app module only for application bootstrapping. You must place all the singleton services, which should only have one instance for the entire application in the core module. For example, the authentication service should only have one instance for each application so that it can be part of the core module.
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Strict Mode : The Angular team has moved to apply the strict mode progressively with an option in Angular 10 to enable strict mode by default for all projects starting with Angular 12. This is a best practice now enabled by default, but if you must disable it for learning purposes, you use the — no-strict option when creating a new project.
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Use Lazy Loading : In angular we can build the SPA(Single page application). This is a modern type of app that’s different from the traditional web apps we created before.Angular loads SPA bundles at once from the server and uses JavaScript or client-side routing to enable users to navigate between different views. Here comes the role of lazy-loading, which revolves around the idea of deferring the loading of specific modules when the users of your application access them. This benefits you by reducing the actual downloading size of the application bundles. Lazy-loading also improves the boot time by not loading unused modules when the application first starts, but only when users trigger navigation. s a best practice, you must lazy-load the feature modules in your application whenever that’s possible.
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Unsubscribe from RxJS Observables: When subscribing your components to RxJS Observables, you should always unsubscribe. Otherwise, this causes unwanted memory leaks as the observable stream is open, even after destroying the component using it. Unsubscribe the component in the ngOnDestory event after destroying the component or use the async pipe to subscribe to Observables and automatically unsubscribe in templates.
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Use ngFor with trackBy: You use the ngFor directive to iterate arrays in Angular templates. When you change an array, the complete DOM tree re-renders, which is not performance-wise.To solve this problem , you must use ngFor with trackBy which uniquly identifies each DOM element and enables angular to re-render only the modified elements.
