Angular: Empty Fiddle

http://angularjs.org/

HTML

<div ng-controller="MyCtrl">
<input type="radio" ng-model="value" value="foo">
<input type="radio" ng-model="value" value="bar">
<input type="radio" ng-model="value" value="baz">    
<hr> 
{{value}}
</div>

JavaScript

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

function MyCtrl($scope) {
    $scope.value= 'foo';
    
    $scope.$watch('value', function(value) {
       console.log(value);
    });
}