Angular Best Practices To Build Clean and Performant Web Applications
                     
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.
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 ● Make a Habit of Using Safe Navigation 
● Use ES6 Functionality Operator (?)
● Maintaining Proper Folder Structure ● Prevent Memory Leaks in Angular 
● Make a Habit of Using Lazy Loading Observable
● Angular Coding Practices ● Using index.ts
● Using “trackBy” Along With ‘ngFor’ ● Build Reusable Components
● Using Interfaces ● Using Immutability
● Single Responsibility Principle ● Implementing Lazy Loading
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.
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.
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.
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
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.
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.
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.
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:

 {{item.id}} 
\
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.
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.
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.
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()
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';
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.
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 (…).
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.
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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