[Vinnl]

> Believe it or not, but managing state is dead simple with just vanilla javascript.

Keeping state and the view in sync, however, is not. For example, if you have a list of TODO's that the user can edit in the browser, and that you want to be able to send to the back-end, every time the user adds a TODO, you'll have to remember to update both the model and the DOM. Likewise after an edit or deletion.

These tools really do solve a problem.

[olavgg]

There is a design pattern for that called Observer pattern.