Removing duplicates from select dropdown Angular JS

<!DOCTYPE html>
<html>

  <head>
    <link rel="stylesheet" href="style.css">
    <script src="//code.angularjs.org/snapshot/angular.min.js"></script>
    <script src="script.js"></script>
  </head>

  <body >
    <div ng-app="app" ng-controller="myController">
    <h5>Removing duplicates using unique filter</h5>
    <select ng-options="fruit.name for fruit in fruits | unique: 'name'"
            ng-model = "fruit">
      
    </select>
    
    </div>
  </body>

</html>

// Code goes here

var app = angular.module('app',[])
.controller('myController', function myController( $scope ){

  $scope.fruits = [{"id":"1","name" : "Apple"},
                  {"id":"2","name" : "Banana"},
                  {"id":"3","name" : "Orange"},
                  {"id":"4","name" : "Apple"},
                  {"id":"5","name" : "Orange"},
                  {"id":"6","name" : "Mango"}]
  
})

//filter to remove duplicates and show unique values
app.filter('unique', function () {

        return function (items, filterOn) {

            
            if (filterOn === false) {
                return items;
            }

            if ((filterOn || angular.isUndefined(filterOn)) && angular.isArray(items)) {
                var hashCheck = {}, newItems = [];

                var extractValueToCompare = function (item) {
                    if (angular.isObject(item) && angular.isString(filterOn)) {
                        return item[filterOn];
                    } else {
                        return item;
                    }
                };

                angular.forEach(items, function (item) {
                    var valueToCheck, isDuplicate = false;

                    for (var i = 0; i < newItems.length; i++) {
                        if (angular.equals(extractValueToCompare(newItems[i]), extractValueToCompare(item))) {
                            isDuplicate = true;
                            break;
                        }
                    }
                    if (!isDuplicate) {
                        newItems.push(item);
                    }

                });
                items = newItems;
            }
            return items;
        };
    });

/* Styles go here */