var app = angular.module('myApp' , []);
app.controller('myController' , ['$scope' , function($scope)) {
$scope.sum = function(val) {
return 3+5;
};
}]);
<body>
<h2>Attaching behavior to controller - AngularJS</h2>
<div ng-app="myApp" ng-controller="myController">
Sum of 3 and 5
is {{sum()}}
</div>
</body>