title: charAt coming back as undefined
body: <p>I've got the following function, however it's saying the charAt is undefined. The error is relating to the alert line. If i do alert(value) it gives me the value no problems.</p>
  
  <pre><code>$scope.markAnswer = function(answerID, questionID) {
          if ($scope.containsObject(answerID, $scope.selectedAnswer)) {
              $scope.selectedAnswer.splice($scope.selectedAnswer.indexOf(answerID), 1);
          } else {
              $scope.selectedAnswer.push(answerID);
          }
  
          angular.forEach($scope.selectedAnswer, function(value, key) {
              alert(value.charAt(0));
              if(questionID == res){
                  $log.info("questionID");
              }
  
          });
      }
  </code></pre>
  
  <p>The following error:</p>
  
  <pre><code> TypeError: undefined is not a function
      at http://127.0.0.1:9000/modules/core/controllers/home.js:57:25
      at Object.forEach (http://127.0.0.1:9000/lib/angular/angular.js:325:18)
      at Scope.$scope.markAnswer (http://127.0.0.1:9000/modules/core/controllers/home.js:56:17)
      at http://127.0.0.1:9000/lib/angular/angular.js:10903:21
      at http://127.0.0.1:9000/lib/angular-touch/angular-touch.js:441:9
      at Scope.$eval (http://127.0.0.1:9000/lib/angular/angular.js:12811:28)
      at Scope.$apply (http://127.0.0.1:9000/lib/angular/angular.js:12909:23)
      at HTMLDivElement.&lt;anonymous&gt; (http://127.0.0.1:9000/lib/angular-touch/angular-touch.js:440:13)
      at HTMLDivElement.jQuery.event.dispatch (http://127.0.0.1:9000/lib/jquery/dist/jquery.js:4430:9)
      at HTMLDivElement.elemData.handle (http://127.0.0.1:9000/lib/jquery/dist/jquery.js:4116:28)
  </code></pre>