Angular: Empty Fiddle

http://angularjs.org/

HTML

<script src="http://code.angularjs.org/angular-1.0.1.js"></script>
<div ng-app="myApp" ng-controller="MyCtrl">
    
    <!-- this if comparison is what I want to do -->
    <ul>
        <li ng-repeat="item in data">
            <div ng-if="angular.isString(item)">
                {{ item }}
            </div>
        </li>
    </ul>
    
    <hr>
        
    <!-- tried to debug by outputting the result of angular.isString, but it doesn't return anything -->        
    <ul>    
        <li ng-repeat="item in data">
            {{ angular.isString(item) }}            
        </li>
    </ul>
</div>

JavaScript

var myApp = angular.module('myApp',[]);

function MyCtrl($scope)
{
    $scope.data =
    [
        "Hello",
        "-",
        123
    ];
}