Uncaught ReferenceError: $scope is not defined

You wrongly used $scope outside the controller. Use the $scope inside the controller

angular.module('myApp', []).controller("RaffleCtrl", function ($scope) {
  $scope.entries = [
      {
        name: "Larry"
      }, {
        name: "Curly"
      }, {
        name: "Moe"
      }
    ];

   $scope.addEntry = function () {
     $scope.entries($scope.newEntry)
     $scope.newEntry = {}
   };
});