If you need a custom pipe, before creating one, consider checking out the NGX Pipes package which has 70+ already implemeted custom pipes.

Here are some examples:

<p>{{ date | timeAgo }}</p> 
<!-- Output: "last week" -->

<p>{{ 'foo bar' | ucfirst }}</p>
<!-- Output: "Foo bar" -->

<p>3 {{ 'Painting' | makePluralString: 3 }}</p>
<!-- Output: "3 Paintings" -->

<p>{{ [1, 2, 3, 1, 2, 3] | max }}</p>
<!-- Output: "3" -->

Links

• https://github.com/danrevah/ngx-pipes