#custompipe

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Pipe tutorial for Angular 12; In this tutorial, we'll learn about Angular's default and custom pipes. Angular comes with a plethora of built-in Pipes that can help you solve a variety of programming issues while designing a single-page web application. We'll also learn how to build custom Angular Pipe from the ground up. Let's get started without further hesitation:

Angular 13 Pipe Example

- Working with Angular Pipes - Angular Built-in Pipes - Creating Custom Pipe in Angular

Getting Started

Pipes are incredibly important when it comes to managing data within interpolation " | ", and we'll talk about them in Angular. Pipes were once known as filters in Angular, but they are now known as Pipes. The letter | can be used to alter data. The syntax for the same can be found below. {{ i will become uppercase one day | uppercase }} Dates, arrays, texts, and integers are all acceptable inputs for pipes. | is used to separate inputs. Before being shown in the browser, the inputs will be transformed into the desired format. We'll take a look at a few pipe-related instances. We're attempting to show the given text in uppercase in the given example. You'll be able to do that with the use of pipes, as demonstrated below — The convertText variable is defined in the app.component.ts file - app.component.ts import { Component } from '@angular/core'; @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: }) export class AppComponent { convertText: string = "I Am Being Managed By Pipes"; } The following code section can be found in the app.component.html file. app.component.html {{convertText | lowercase}} {{convertText | uppercase}}

Angular Built-in Pipes

Angular Pipes allow you to rapidly recreate data in your Angular app. Angular has a built-in Pipes API that allows you to quickly change your data. You may also use it to make custom Pipes in your app. Let's take a look at some of the most helpful Angular Pipes. Built-in Angular Pipes - Async Pipe - Currency Pipe - Date Pipe - Slice Pipe - Decimal Pipe - Json Pipe - Percent Pipe - LowerCase Pipe - UpperCase Pipe

How to Use Built-in Pipes in Angular 13

Let's see how we may make advantage of the built-in Angular pipes. 1. Async Pipe When obtaining data in the form of observables, the Async pipe is regarded the best technique. The async pipe automatically subscribes to an Observable/Promise and returns the values delivered. {{ users.name }}   2. Currency Pipe The angled currency pipe allows you to convert numbers between different currencies. import { Component } from '@angular/core'; @Component({ selector: 'app-root', template: ` Currency Pipe {{ itemPrice | currency:'USD':true }} {{ itemPrice | currency:'EUR':true}} {{ itemPrice | currency:'INR' }} ` }) export class AppComponent { itemPrice: number = 5.50; }   3. Date Pipe In Angular, the date pipe is used to format the Date. import { Component } from '@angular/core'; @Component({ selector: 'app-root', template: ` Date Pipe {{ currentDate | date:'fullDate' }} {{ numDateFormat | date:'medium' }} {{ getYear | date:'yy' }} {{ getTime | date:'Hm' }} ` }) export class AppComponent { currentDate = Date.now(); numDateFormat = 1478496544151; getYear = 'Tue Dec 12 2018 11:20:18 GMT+0530'; getTime = 'Wed Jan 20 2019 12:20:18 GMT+0530'; }   4. Slice Pipe In Angular, the Slice pipe API creates a subset list or string. {{ users }}   5. Decimal Pipe In Angular, the Decimal pipe is used to format decimal numbers. CommonModule in Angular has issues with the Decimal Pipe API. import { Component } from '@angular/core'; @Component({ selector: 'app-root', template: ` Decimal Pipe {{myNum1 | number}} {{myNum2 | number}} ` }) export class AppComponent { myNum1: number = 7.4364646; myNum2: number = 0.9; }   6. Json Pipe The JSON pipe API allows an Angular app to expose an object as a JSON string. Behind the scenes, it complements the JSON.stringify function. {{ objectName | json }}   7. Percent Pipe In Angular, the Percent pipe API converts an integer to its percentage value. import { Component } from '@angular/core'; @Component({ selector: 'app-root', template: ` LowerCase & UpperCase Pipe A: {{numA | percent}} B: {{numB | percent:'4.3-5'}} ` }) export class AppComponent { numA: number = 0.349; numB: number = 2.4595; }   8. LowerCase & UpperCase Pipe In an Angular app, lowercase or uppercase pipes help format text to lower or upper case. import { Component } from '@angular/core'; @Component({ selector: 'app-root', template: ` LowerCase & UpperCase Pipe {{convertText | lowercase}} {{convertText | uppercase}} ` }) export class AppComponent { convertText: string = "I Am Being Managed By Pipes"; }

How to Create Custom Pipe in Angular 13

Let's look at how we can make a custom pipe now. Run the following command in Angular CLI to construct a custom pipe to count words: ng g pipe wordcount After running the command in Angular CLI, this is how it will look. ng g pipe wordcount # CREATE src/app/wordcount.pipe.spec.ts (199 bytes) # CREATE src/app/wordcount.pipe.ts (207 bytes) # UPDATE src/app/app.module.ts (433 bytes) This command will automatically generate the files wordcount.pipe.ts and wordcount.pipe.spec.ts, as well as update the app.module.ts file. app.module.ts import { BrowserModule } from '@angular/platform-browser'; import { NgModule } from '@angular/core'; import { AppComponent } from './app.component'; // Custom Pipe imported here by Angular CLI import { WordcountPipe } from './wordcount.pipe'; @NgModule({ declarations: , imports: , providers: , bootstrap: }) export class AppModule { } Now, utilizing the PIPE API service, let's construct a logic for word counting in a string in Angular. Use the code below to open the wordcount.pipe.ts file. import { Pipe, PipeTransform } from '@angular/core'; @Pipe({ name: 'wordcount' }) export class WordcountPipe implements PipeTransform { transform(value: any, args?: any): any { return value.trim().split(/s+/).length; } } app.component.ts import { Component } from '@angular/core'; // Usage of wordcount pipe within interpolation @Component({ selector: 'app-root', template: ` Word Counter Pipe in action below

{{ customText | wordcount }}