ng-class in Angular2

Question

I am developing a test application in angular 2 and I\'m stuck with a problem of adding classes based on list from model.

In Angular 1 one could do:

Answer 1

Using typescript and Angular 2 beta, ngClass doesn't seem to work. From following the API preview - https://angular.io/docs/ts/latest/api/common/NgClass-directive.html

template: '
Class Map
'

The example from Google provides two versions of code (which I assume is Alpha and updated to Beta). The new syntax in the website example doesn't seem to work... any ideas?

@View({
    template: `
        

            

                 

                     
completed
                
                
            
        
        `,
        directives: [NgClass, QuestionSection],
})