Angular Best Practices To Build Clean and Performant Web Applications
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The document outlines best practices for developing web applications using Angular, emphasizing key elements like Angular CLI, ES6 functionality, folder structure, lazy loading, and coding standards. It highlights the importance of modularization, memory management, and creating reusable components to enhance application performance and maintainability. Following these practices is crucial for building robust and efficient Angular applications in 2023.
Angular Best Practices To Build Clean and Performant Web Applications
- 2. Angular Best Practices to Build Web Applications Angular, a completely rewritten version of the AngularJS framework created and maintained by Google, is specifically intended for developing dynamic programming structures. Modules, components, metadata, templates, data binding, services, directives, and dependency injection are the fundamental building blocks of Angular. It frequently develops a wide range of additional internal platforms for developing SPAs with cutting- edge tools including HTML, CSS, and Typescript. Furthermore, as is well known, TypeScript development services are a superscript of the JavaScript framework, which is specifically employed in the creation of Angular apps. We can develop UI applications that are more robust and compatible by utilising Angular technology. Due to these features, Angular will continue to rank among the most widely used front-end frameworks in 2023. To make it simple, we have created an article that outlines the angular js best practices that every developer should adopt to create reliable online applications.
- 3. 14 Angular Best Practices That You Need To Follow The greatest framework for creating strong, feature-rich web applications for your business requirements is Angular. Read the post on what is Angular to learn more about the Angular framework. Let's now examine some of the top Angular best practices that you must adhere to in 2023 for developing powerful online applications. ● Angular CLI ● Use ES6 Functionality ● Maintaining Proper Folder Structure ● Make a Habit of Using Lazy Loading ● Angular Coding Practices ● Using “trackBy” Along With ‘ngFor’ ● Using Interfaces ● Single Responsibility Principle ● Make a Habit of Using Safe Navigation Operator (?) ● Prevent Memory Leaks in Angular Observable ● Using index.ts ● Build Reusable Components ● Using Immutability ● Implementing Lazy Loading
- 4. 1. Angular CLI A comprehensive and powerful tool, Angular CLI (Angular Command Line Interface) aids in the startup, development, maintenance, testing, and even debugging of Angular apps. The primary purpose of the Angular command line interface tool is to streamline scheduling and the entire strategy. 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. Angular CLI makes it simple to start the app development process and is regarded as one of the simplest ways to comprehend business logic, regardless of whether another developer has worked on it. It will eventually lower many costs and provide engineers with more time.
- 5. 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 that is developed locally and needs to be tested in the developing phase. ● ng test: It is used to run end-to-end or local unit testing 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.
- 6. 2. Use ES6 Functionality ES6 stands for ECMAScript 6, and it gives you the ability to work with new syntax and angular features to create code that is more up-to-date and comprehensible. New features and functions are continually added to ES6. You can frequently programme JavaScript more easily thanks to ES6 capabilities like Let and Const, Arrow Functions, and Object Literals string interpolation.
- 7. 3. Maintaining Proper Folder Structure Maintaining file and folder structures that make your work easier is one of the most popular Angular-recommended practices. Let's examine the naming conventions for files and classes as well as the structure of the folder hierarchy in an Angular project. ● File Naming ● Class Naming ● Folder Structure
- 8. 4. Make a Habit of Using Lazy Loading Different modules, such as documents, JS, CSS, videos, photos, etc., are often loaded slowly. It is exclusively in charge of accelerating the application's load time, and it typically does so by splitting the load into numerous packets and loading them as needed. Lazy loading can be useful to you while your large application loads rather than employing other related routines to accomplish a lazy load of the feature modules. When something is used, lazy load processing will begin. Instead of loading the component in the AppRoutingModule routes configuration, the Angular developers working for the top AngularJS development company use the lazy-loading function to loadChildren.
- 9. 5. Angular Coding Practices You must adhere to Angular code standards, which is one of the most popular Angular best practises. It is a powerful method for creating mobile and online applications. To create Angular applications that offer the best user experience, you can adhere to specific coding standards. Full-stack developers find it difficult to address urgent problems and fix defects, especially when working with intricate code structures.
- 10. 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. ● Per file, the code must not exceed 400 lines limit ● Per function, the code must not exceed 75 lines ● Utilise custom prefixes to prevent element name collisions with components in other apps and with native HTML elements. ● If the values of the variables are intact, declare it with const ● Names of properties and methods should be in lower camelcase ● Always leave one empty line between imports and modules such as third-party and application imports and third-party module and custom module ● We shouldn’t name our interfaces with the starting capital I letter as we do in some programming languages.
- 11. 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 the defined array rather than re-rendering DOM. 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: <ul> <li *ngfor= "let item of collection;"> {{item.id}} </li> </ul>
- 12. 7. Using Interfaces Interfaces are crucial, especially when a contract for a class needs to be created. Additionally, it aids in the creation of the class needed to implement the functions and attributes specified in the interface. As an illustration, consider how the class HomeComponent implements the OnInit and OnDestroy methods in the Angular application. You may manage object literals with the help of interfaces. Our object must implement every property of the interface if it is an interface type.
- 13. 8. Single Responsibility Principle Avoiding the creation of several components, services, or directives inside of a single file is one of the fundamental Angular best practices that every developer must adhere to. The single responsibility concept states that each file in an Angular application should only be in charge of creating a single, distinct functionality. We keep our files organised, readable, and maintained with the support of the single responsibility concept.
- 14. 9. Make a Habit of Using Safe Navigation Operator (?) To be on the safe side, programmers can only access a property directly from one object in a component's template by using the safe navigation operator. When attempting to access a property for a null object, an exception will be raised. The template will disregard the null value and access the property once the object is no longer null, however, if they develop a habit of using the save navigation (?) operator, they will be able to access it.
- 15. 10. Prevent Memory Leaks in Angular Observable Nearly all programming languages, frameworks, and Angular libraries have observable memory leaks. And Angular is a perfect example of it. Every business need in Angular apps requires the use of observables, which are essential for developing and building Angular projects. Although it can just simplify application data, a memory leak is one of the serious problems that might happen if you are not paying attention. The worst condition can be produced in the middle of progress. Here’re some of the tips that developers need to follow to avoid leaks. ● Using async pipe ● Using take(1) ● Using takeUntil()
- 16. 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 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. import {Article, ArticleConfig} from '..article';
- 17. 12. Build Reusable Components Build a component out of it and use the feature if you need to use UI throughout your Angular application. If the UI is drastically altered, it will save you a lot of trouble. Therefore, you do not need to update the UI code quality everywhere. Instead, all you need to do is alter the component's code. To accomplish this, you might need to employ property and event bindings to send inputs to the reusable components and receive output events from various components, respectively.
- 18. 13. Using Immutability Javascript's reference types are objects and arrays. The ideal practice is to replicate them immutably into another object or an array before making changes to them. 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 (…).
- 19. 14. Implementing Lazy Loading You are strongly encouraged to include a lazy loading functionality, especially when working with applications that have multiple modules. The advantage of the lazy loading strategy is that resources can be quickly loaded when needed rather than all at once. They will eventually be able to cut down on startup time thanks to it. Applications are lazy loading modules as soon as a user navigates to their routes.
- 20. Conclusion We've learned about Angular's best practices for coding and other crucial elements that facilitate the development of Angular applications. You can create web applications with ease thanks to the Angular project framework. Additionally, there is always room for improvement in the manner in which we create software and code. We have covered all the key elements and best practices that organisations may utilise in their Angular development process to get the most out of it with our in-depth, opinionated article on the best practices.
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