How to take actions when data changes

Dealing with not having access to Angular's $scope object (using $watch)

`

<script> //console.dir(scope) // this also works //console.dir(scope.msg) // This doesn't because scope.msg doesn't yet exist

// Lambda function to access the Angular Scope ;(function(scope) { //console.log('--- SCOPE ---') //console.dir(scope) // this works but you only get it once (on startup) //console.dir(scope.msg) // Doesn't work for because scope.msg doesn't yet exist

//Have to use $watch so we pick up new, incoming msg's
scope.$watch('msg.payload', function(newVal, oldVal) {
    console.log('- Scope.msg -')
    console.dir(scope.msg)
})

})(scope) </script> `