Give an example of custom pipe?

You can create custom reusable pipes for the transformation of existing value. For example, let us create a custom pipe for finding file size based on an extension,

import { Pipe, PipeTransform } from '@angular/core';
@Pipe({ name: 'customFileSizePipe' })
export class FileSizePipe implements PipeTransform {
transform(size: number, extension: string = 'MB'): string {
return (size / (1024 * 1024)).toFixed(2) + extension;

Now you can use the above pipe in template expression as below,

template: `
<h2>Find the size of a file</h2>
<p>Size: {{288966 | customFileSizePipe: 'GB'}}</p>

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Made by Michael Sakhniuk