useful angulr basic filters

_filter.controller.js

(function() {

    'use strict';

    angular
        .module('app')
        .filter('STRING_LIMIT_FILTER', function() {
            return function(input, num) {
                let output = input.split(' ').slice(0, num).join(' ');
                return output;
            };
        })
        .filter('FIRST_CAPS', function() {
            return function(input) {
                let output = input ? (input.charAt(0).toUpperCase() + input.substr(1).toLowerCase()) : '';
                return output;
            };
        })
        .filter('isEmpty', function() {
          return function(object) {
            return angular.equals({}, object);
          };
        })
        .filter('fromNow', function() { // require moment.js
          return function(input) {
            return moment(input).fromNow();
          };
        })
        .filter('htmlDecode', function () {
            // can use as `let output = $filter('htmlDecode')(inputString)` in JS 
            return function (input) { // input is string with html entities such as …
                let doc = new DOMParser().parseFromString(input, "text/html");
                let output = doc.documentElement.textContent;
                return output;
            };
        });
}());