Pipes have been around since AngularJS. They’re useful at transforming data, especially when the same transformation is used throughout the application. Pipes make it easy to add these transformations into your component template.
Angular Pipes
Angular includes several pipes to add to your template. You don’t need to import them or add them as directives or anything—just start using them.
lowercase
Lowercase: {{ "The Quick Brown Fox Jumped Over The Lazy Dogs" | lowercase }}
Produces:
Lowercase: the quick brown fox jumped over the lazy dogs
uppercase
Uppercase: {{ "The Quick Brown Fox Jumped Over The ...
