অ্যাঙ্গুলারজেএস watch

<!DOCTYPE html>
<html ng-app="app">
<body>

  <div ng-controller="app">
    <input ng-model="name">
    <p>{{name}}</p>
  </div>

  <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.8.3/angular.min.js"></script>
  <script>
    angular.module("app", [])
      .controller("app", function($scope) {
        $scope.name = "আরিফ";

        $scope.$watch("name", function(n, o) {
          console.log(n, o);
        });
      });
  </script>

</body>
</html>