Angular Pipes

Angular pipes are a way to transform data in an Angular template. They are a simple way to show filtered or formatted data to the user. Angular comes with a set of built-in pipes, but you can also create your own custom pipes.

Built-in Pipes

Here are a few examples of built-in pipes:

Currency Pipe

The currency pipe formats a number as a currency string. It takes an optional parameter to specify the currency code, such as USD for US dollars or EUR for euros.

<p>{{ price | currency }}</p>
<p>{{ price | currency:'USD' }}</p>
<p>{{ price | currency:'EUR' }}</p>

Date Pipe

The date pipe formats a date object as a string. It takes an optional parameter to specify the format, such as short, medium, or long.

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

Uppercase Pipe

The uppercase pipe converts a string to uppercase.

<p>{{ name | uppercase }}</p>

Lowercase Pipe

The lowercase pipe converts a string to lowercase.

<p>{{ name | lowercase }}</p>

Custom Pipes

You can create your own custom pipes in Angular by implementing the Pipe interface. Here is an example of a custom pipe that capitalizes the first letter of a string:

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

@Pipe({
  name: 'capitalize'
})
export class CapitalizePipe implements PipeTransform {
  transform(value: string): string {
    if (!value) return '';
    return value.charAt(0).toUpperCase() + value.slice(1);
  }
}

You can use the custom pipe in your templates just like the built-in pipes:

<p>{{ name | capitalize }}</p>

Conclusion

Angular pipes are a simple way to transform and format data in your templates. They can help you display data in a more user-friendly way, and you can even create your own custom pipes for specific needs.

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