Introduction

Angular Pipes are a powerful mechanism in Angular that allows you to transform data in your templates. They provide a clean and reusable way to format, filter, or manipulate data before displaying it to the user.

Angular Pipes

Angular Pipes are functions that take an input value and transform it into a desired output. They are declared using the pipe symbol (|) followed by the pipe name. For example, the uppercase pipe transforms text to uppercase:

<p>{{ 'hello world' | uppercase }}</p>

This will render as:

HELLO WORLD

Built-in Pipes

Angular provides a set of built-in pipes that cover common data transformation needs. Here are a few examples:

• uppercase: Converts text to uppercase.
• lowercase: Converts text to lowercase.
• date: Formats dates.
• number: Formats numbers.
• currency: Formats currency values.

Custom Pipes

You can create your own custom pipes to extend Angular's functionality. Custom pipes allow you to encapsulate specific data transformations that are relevant to your application. Here's a basic example:

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({ name: 'reverse' })
 export class ReversePipe implements PipeTransform {
  transform(value: string): string {
    return value.split('').reverse().join('');
  }
}

This pipe reverses a string. You can then use this pipe in your templates:

<p>{{ 'hello world' | reverse }}</p>

This will render as:

dlrow olleh

Using Pipes

To use a pipe, simply place it after the value you want to transform, separated by the pipe symbol (|). You can pass arguments to pipes to customize their behavior. For example:

<p>{{ date | date: 'medium' }}</p>

This will format the date variable using the 'medium' format.

Summary

• Angular Pipes provide a concise way to transform data in your templates.
• Built-in pipes cover common data formatting needs.
• You can create custom pipes for specific transformation logic.
• Pipes can be chained together to achieve complex transformations.
• Avoid using pipes for complex business logic.