never bind a function in a template

As the only one @Michael_Hladky told me to 'never bind a function in a template' here is a repo to demonstrate the issue

demo

See it in action on firebaseapp

Be sure to open the debug console in your browser

problem description

when you are binding a function in a template you may not be aware of how often the binding is executed.

this project tries to clarify the problem and show some solutions