Angular filter - Move an array item to first position but preserve the rest of the lists order (only set up for basic array of either integers or strings)

itemFirst.filter.js

(function() {
  'use strict';

	angular
		.module('fcp')
		.filter('itemFirst', itemFirst);

	/** @ngInject */
	function itemFirst($filter) {

		var filter = function(input, property, key) {
			var out = [];

			if (typeof input !== 'undefined') {
				if (typeof key !== 'undefined') {
					var first = $filter('filter')(input,key,true);
					var everythingElse = $filter('filter')(input,'!'+key,true);

					out = first.concat(everythingElse);
				} else {
					out = input;
				}
			}

		    return out;

		};

		return filter;
	}

})();