JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-app="Joy" ng-controller="JoyCtrl"> <span ng-bind="item.num | formatNumber"></span>

</div>

JavaScript

angular.module('Joy', [])
    .controller('JoyCtrl', function ($scope) {
    $scope.item = {
        num: 3
    };
}).filter('formatNumber', function () {
    return function (input) {
        return input + 'km';
    }
});;