{{child.property1}}:{{parent.property1}}
```
file: app.js
```javascript
const app = angular.module('MyApp', []);
app.controller('ParentController', [function(){
this.property1 = 'fun';
}]);
app.controller('ChildController', [function(){
this.property1 = 'awesome';
}]);
```
## Use services to add functionality to controllers
1. Services provide additional functionality to your controller
- names always start with $
- examples
- $scope
- handles how view receives data
- $log
- logging
- $http
- handles AJAX
1. Need to be passed in as parameters of controller
```javascript
app.controller('SomeController', [ '$someService', function($someService){
$someService.doStuff();
}]);
```
1. Array syntax with `$someService` string avoids problems later on with minifying your code