https://dzone.com/articles/angular-2-vs-angular-4-features-performance
origin - http://www.pipiscrew.com/2017/08/angular-2-vs-angular-4/ angular-2-vs-angular-4
https://dzone.com/articles/angular-2-vs-angular-4-features-performance
origin - http://www.pipiscrew.com/2017/08/angular-2-vs-angular-4/ angular-2-vs-angular-4