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<!DOCTYPE html>
<html ng-app='app'>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.0/angular.min.js"></script>
  <meta charset="utf-8">
  <title>Dependency injection</title>
</head>
<body>
​
  <div ng-controller="login">
    <div  ng-if='!user.isAuthenticated'>
      You are not logged in yet.
      <button ng-click="user.login()">
        Log in
      </button>
    </div>
  </div>
  
  <div ng-controller="welcome" >
   <div ng-if='user.isAuthenticated'>
      Hello, {{user.firstName + ',' +  user.lastName}}
    </div>
  </div>
  
  
</body>
</html>
 
(function () {
  var app = angular.module('app', []);
  
  app.factory('user', function () {
    return {
      isAuthenticated: false,
      login: function () {
        this.firstName = 'John';
        this.lastName = 'Doe';
        this.isAuthenticated = true;
      }
    };
  });
  
​
  app.controller('login', function ($scope, user) {
    $scope.user = user;
  });
  
  
  app.controller('welcome', function ($scope, user) {
    $scope.user = user;
  });
  
})();
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