What are Pipes in Angular

Angular pipes are a powerful feature that allows you to transform and format data directly in your templates. They are used for displaying data in a user-friendly way without modifying the underlying data.

Introduction to Pipes

Pipes in Angular are similar to filters in other frameworks. They take in data, transform it, and then display the modified data in the template.

Using Pipes in Templates:

• Pipes can be used in template expressions to format and transform data.

//Example of using a pipe in Angular template
<p>{{ currentDate | date:'short' }}</p>

Chaining Pipes:

• Pipes can be chained to perform multiple transformations on the data.

//Example of chaining pipes in Angular template
<p>{{ amount | currency:'USD':true:'1.2-2' | lowercase }}</p>

Common Built-in Pipes

Angular comes with a set of built-in pipes that cover common formatting needs.

DatePipe:

• Formats dates based on the provided format.

//Example of using DatePipe in Angular template
<p>{{ currentDate | date:'medium' }}</p>

UpperCasePipe and LowerCasePipe:

• Convert text to uppercase or lowercase.

//Example of using UpperCasePipe and LowerCasePipe in Angular template
<p>{{ textValue | uppercase }}</p>
<p>{{ textValue | lowercase }}</p>

CurrencyPipe:

• Formats a number as currency.

//Example of using CurrencyPipe in Angular template
<p>{{ price | currency:'USD':true:'1.2-2' }}</p>

Creating Custom Pipes

You can also create your own custom pipes for specific data transformations.

Creating a Pipe:

• Create a custom pipe by implementing the PipeTransform interface.

// Example of creating a custom pipe in Angular
import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
  name: 'myCustomPipe'
})
export class MyCustomPipe implements PipeTransform {
  transform(value: any, args?: any): any {
    // Custom logic goes here
    return transformedValue;
  }
}

Using Custom Pipe:

• Use the custom pipe in the template as you would with a built-in pipe.

//Example of using a custom pipe in Angular template
<p>{{ dataValue | myCustomPipe }}</p>

Conclusion

In this tutorial, we’ve explored the concept of Angular pipes, which provide a convenient way to format and transform data in templates. We looked at some common built-in pipes and learned how to create custom pipes for specific needs.

In the next tutorial, we’ll delve into Angular testing, covering unit testing with Jasmine and Karma, as well as end-to-end (E2E) testing with Protractor.

“Angular pipe tutorial for beginners”
“Understanding Angular pipes examples”
“Best practices for using pipes in Angular”
“Custom pipes in Angular explained”
“Angular date pipe usage and tips”
“Efficient data filtering with Angular pipes”
“Exploring lesser-known Angular pipe features”