JSFiddle - React, Tailwind, and code Playground
HTML
<div ng-app="euro">
<p>
{{-4|euro}}
</p>
</div>JavaScript
var app=angular.module("euro",[]);
app.filter("euro", function() {
return function(number){
if (isNaN(number)){return "wrong number";}
if(number<0){number=number*(-1); }
return "€ " + number}
});