AngularJS getter & setter

<!DOCTYPE html>
<html ng-app="myApp">
<head>
	<meta charset="UTF-8">
	<title>Hello World AngularJS</title>
	<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.3/angular.min.js"></script>
	<script src="controller.js"></script>
</head>
<body ng-controller="myCtrl">
	<input type="text" ng-model="myText" ng-model-options="{getterSetter: true}">
	{{text}}
</body>
</html>

var app = angular.module('myApp', []);

app.controller('myCtrl', function($scope) {

	var myText = "HELLO";

	$scope.myText = function(newText) {
		if(angular.isDefined(newText)) {
			myText = newText.toUpperCase();
			return myText;
		} else {
			return myText;
		}
	};

});