angularJS ng-repeat (2)

ng-repeat no longer allows duplicates.

HTML

<script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
<script src="http://code.angularjs.org/1.1.4/angular.js"></script>
<div ng-controller='ctrl'>
    <ol>
        <li ng-repeat='i in list'>
            <input type='text' ng-model='i.value'></input>
            <button ng-click='deleteItem($index)'>Delete</button>
            
        </li>
    </ol>
    <button ng-click='addItem(item)'>Add</button>
    <div>ITEM: {{list | deValue | json}}</div>
</div>

CSS

html, body {
    height: 100%;
    width: 100%;
}

JavaScript

angular.module("app", []).controller("ctrl", function ($scope) {
    $scope.list = [{value:"one"},{value:"two"}];
    $scope.addItem = function (item) 
    {
        $scope.list.push({value:""});
    };
    
    $scope.deleteItem = function (idx) 
    {
        var item_to_delete = $scope.list[idx];
        $scope.list.splice(idx, 1);
    };
    
})
.filter("deValue", function() {
    function deValue(x) {
        return x != null ? x.value : null;
    }
    
    return function(x) {
        if( angular.isArray(x) ) {
            var ret = [], i;
            for( i=0; i < x.length; i++ ) {
                ret.push(deValue(x[i]));
            }
            return ret;
        }
        else return deValue(x);
    };
});