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It's easy to create custom pipes to use in your templates to modify interpolated values. You don't have to duplicate your code if you want to also use a pipe's functionality in a component class. All you have to do really is inject the pipe like a service, and then call its transform method.

The following works for any Angular 2+ app.

Say we have a custom <^>CapitalizePipe<^> that capitalizes every word that's longer than 2 characters:

				
					
[label capitalize.pipe.ts]

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

Now, given that your pipe has been properly added to your module's declarations, you can inject it in a component's class like this:

				
					
[label app.component.ts]

// ...

import { CapitalizePipe } from './capitalize.pipe';



@Component({

 selector: 'app-root',

 templateUrl: './app.component.html',

 styleUrls: ['./app.component.css'],

 providers: [ CapitalizePipe ]

})

export class AppComponent {

 constructor(private capitalize: CapitalizePipe) {}

And to use it you simple call <^>transfom<^> on the injected instance:

				
					
onSubmit(value) {

 this.data = this.capitalize.transform(value);

 // ...

}

👍 Simple as that! Now you can define logic in custom pipes that can be reused directly in component classes without duplicating code.