javascript - I replaced $scope to a variable and now my angular application doesn't work -

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i'm doing angular application , read it's practice don't use $scope. replaced variable, , data not appearing on page:
this: 

observatoryapp.controller('appcontroller', function appcontroller($scope, $http){   var $scope = this;   $scope.years = [];   $http.get('json/years.json').then(function(response){     $scope.years = response.data;     $scope.data = $scope.years[0];   });

now this:

observatoryapp.controller('appcontroller', function appcontroller($http){   var self = this;   self.years = [];   $http.get('json/years.json').then(function(response){     self.years = response.data;     self.data = self.years[0];   });

and data not showing on index.html page:

<body ng-controller="appcontroller">   ...   <select class="year form-control"     ng-options="year.id year in years"     ng-model="data">   </select>   ... </body>

what i'm doing wrong?

i read it's practice don't use $scope

that have been in context of using controlleras alias alternative.

unless use alias use injected $scope assign model properties to. never var $scope = this;


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