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How to check if a scope variable is undefined?
This does not work:
<p ng-show="foo == undefined">Show this if $scope.foo == undefined</p> 
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The $ in AngularJs is a built-in object.It contains application data and methods.
The $scope in an AngularJS is a built-in object, which contains application data and methods. You can create properties to a $scope object inside a controller function and assign a value or function to it. The $scope is glue between a controller and view (HTML).
$rootScope is a parent object of all “$scope” angular objects created in a webpage. $scope is a child object that is used to bind the HTML(view) & Javascript(Controller) in a webpage. It is created with the ng-app directive. It is created with the ng-controller directive.
In short, in case of dependency injection the scope object is received as $scope while in case of non-dependency injection scope object is received as scope or with any name. Save this answer.
Here is the cleanest way to do this:
<p ng-show="{{foo === undefined}}">Show this if $scope.foo === undefined</p> No need to create a helper function in the controller!
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