AngularJS applications are controlled by controllers. A controller is a JavaScript Object, which is created by a standard JavaScript object called constructor. In below example lastName and firstName are two properties of controller object demonstrated below.
<div ng-app="myApp" ng-controller="myCtrl">
First Name: <input type="text" ng-model="firstName"><br>
Last Name: <input type="text" ng-model="lastName"><br>
<br>
Full Name: {{firstName + " " + lastName}}
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.firstName = "Raj";
$scope.lastName = "shekhar";
});
</script>
Reference
http://www.w3schools.com/angular/angular_controllers.asp
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