Top 10 Angular Best Practices To Follow In 2020

Top 10 Angular Best Practices To Follow In 2020

Angular Development has emerged as one of the most prominent technologies for mobile/web application development. It is developed and managed by the google team, so there’s no doubt about its popularity. In spite of the fact that the angular developers are efficient enough to develop web applications, they need some best practices to ensure the web applications’ performance and speed. To make the Angular web applications user friendly and super-responsive, you must follow the best practices. Here we’ll see some best practices for angular web app development services. Before proceeding for the angular web apps let us see some important terms in Angular.

What is DOM in Angular?

DOM stands for Document Object Model. Angular directives are used to bind the application data with HTML attributes and these are as follows-

  • ng-disabled
  • ng-show
  • ng-hide

What is @component in Angular?

@components are primary building blocks in Angular UI. Angular components are the subsets of directives. Angular components are the combination of properties templates, style, selector and many other properties.

What is lazy loading in Angular?

Lazy loading means delaying the object until it is required. It is a process of loading modules like images, videos and so on. The main aim of lazy loading in Angular is to improve the loading time by prioritizing modules and displaying required modules only. 

Top 10 Angular Best Practices To Follow In 2020-

1. Lazy Loading Feature Module-

Use of lazy load modules can improve your productivity. It is an inbuilt feature in Angular that helps developers to load the thing which is required. For instance, when you use the feature, it loads the components and other things that you need and stop other unnecessary  files to get loaded. Let us see how it functions;

// app.routing.ts
{ path: 'not-lazy-loaded', component: NotLazyLoadedComponent }

Here the ‘LazyLoading’ isn’t in place and you will end creating huge and unnecessary heavy-sized applications. When you use ‘LazyLoad’ and it helps you reduce the size of the application by abstaining from unnecessary file from loading.

2. Angular coding styles-

Using coding standards helps to carry out smooth angular web app development. Most of the angular developers struggle with the bug issues and bug fixing while developing angular app. You can follow several coding styles for better results like user-experience and lesser number of errors and bug etc. It is preferred to use naming conventions for files with similar names such as-

Tws.component.css

tws.component.html

General naming conventions in Angular:

  • Separate files by using dots-

.service, .component, .pipe and .module are the different files where this naming convention can be applied to reduce the complications.

tws.service.ts

  • Symbols and Filenames-

It is necessary to use filenames as per the symbols. For instance:

@Component({....})
Export class Tekkiwebsolutions { }
Tekkiwebsolutions.component.ts

@Directive({...})
Export class Tekkiwebsolutions { }
Tekkiwebsolutions.directives.ts

@NgModule({....})
Export class AppModule { }
app.module.ts

3. Use trackBy rather than ngFor-

‘ngFor’ is a built-in template directive in Angular and generally we use it to create a template for each item in application. Developers can use ‘trackBy’ rather than ‘ngFor’ that help you to bring a unique and customized identifier each item rather than rendering the whole DOM tree.

How ‘trackBy’ Helps-

When you use ‘ngFor’, you need to re-render the entire DOM tree after each change in the array while using ‘trackBy’, you can specify the changes separately and it will help angular to make DOM changes for the defined array. When you use ‘ngFor’ like;

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

Now, each time when the changes occur, the whole DOM tree will be re-rendered. When you use ‘trackBy’ functions, like;

@Component({
Selector: ‘my-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; // or item.id
 }
 }

Now, it returns a unique identifier for each item and will be rendered only the selected item.

4. Folder structure for Angular-

Folder structure creation is an important factor that you should consider before starting a project. If you have not structured the folder properly, then you might face a lot of problems that  keep haunting you throughout your development process. Regardless of whether it is medium and large- sized project, you come across a lot of changes in between development and your project should easily adapt to the new changes made in the middle of development. Also, that is possible when you have created an appropriate folder in place.

5. Angular in-app navigations(Routing):

In-application navigation is used to handle the navigation with one view to another view. Single-page apps allow the user to show or hide the parts of the display.

Best practices for angular routing are:

  • Creating modular routes
  • Lazy loading routes
  • Lazy loading routes with Preload
  • Organizing routes guards

6. Clean Application Structure with Angular Modular Development-

Each web application should be rapid. Enterprise web apps contain some modules with multiple functionalities. The modularization of the angular code is useful in initial loading time and organizes the code in appropriate structure.

7. Utilizing ES6 Features-

Angular comes up with some significant upgrades in all its release. ECMAScript is one of the JavaScript versions which continually get updated with new functionalities and features. Now, you have ES6 which has a lot of new features and functionalities that you can use in Angular.

‘let and const’ instead of ‘var’ –

Using ‘let and const’ rather than ‘var’ allows you to prevent issues and problems that you have because of var. ‘let‘ can be used in a normal situation and the value does not receive any changes, then ‘const’ should be in place. Example;

let temp;
Const pi = 3.14159

Spread Operator:

ES6 has a ‘spread operator’  that is represented by 3 dots(..) which offers to help with some common tasks, however so far in ES6, it is used just for arrays. It helps ‘iterable’ that can be strings, arrays and sets to get spread inside the receiver. This is how it works-

With Array;

const items = ['This', 'is', 'a', 'sentence'];
console.log(items) // Line 1
console.log(...items) // Line 2
// [ 'This', 'is', 'a', 'sentence' ] // Output 1
// This is a sentence // Output 2

Example with Object:

const obj = { name: 'Foo', age: 22 };
const newObj = { ...obj }
console.log(newObj)
// { name: 'Foo', age: 22 }

8. Save Memory Bytes by using AsyncPipes-

Memory leaks are common and found in each programming language, library or framework. Observables in Angular are helpful because it streamlines data, however memory leak is a serious issue that may occur if you are not focused. It can make the most terrible circumstance in the middle of development. Let us see the tips to avoid leaks.

Using ‘take(1):

‘take(1)’ is an operator that completes the emission by taking its value and enables the ‘take(1) not to subscribe when new value is encountered with. It will ensure that you get the data just one time. Be secure with ‘take(1)’ and avoid memory leaks. Here’s the way it occurs;

data$.pipe(take(1)).subscribe(res=>console.log(res))

Using ‘async pipe’:

You can use subscribed observables or use ‘async pipe’ and promise in the view. You should prevent yourself from subscribing observables in the component and binding that in view. So, finally if a complete observable technique is not in place, memory leaks are vulnerable to occur.

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

9. Differentiate the Smart and Dumb components in Angular-

We should initially analyse what is savvy components and dumb components in angular development:- Smart components used in data manipulation, calling APIs, and different functionalities, Whereas, dumb components are those who focus on how they look like.

Analyzing both these components is a necessary part of the angular best practices 2020. It implies the smart components include how things work, whereas dumb components include how UI will look and about reusability.

10. State management-

State management in Angular helps to manage state transitions by storing state of any form of data. There are multiple state management libraries like NGRX, NGXS, Akita and so on with different use, purposes and states. All these are good to use, however NGXS could be the preferred one as most of the developers have referred to this as most usable and simple to learn the tool.

Final Words-

Building an user friendly and super-responsive application is not an easy task, but can be ease by following the above best practices. If you are still facing the problem with Angular development, consult with Solace experts. We are here to help you through consultation and development. You can hire angular developers of Solace team for effective and efficient Angular development. We will be happy to help you.

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