[cout]

This is exactly the point of vue. On the surface, it looks a lot like a cleaner angularjs, but it's very different. There's no need for a digest cycle to re-evaluate watch expressions on each iteration, because it uses getters and setters to detect changes (though it still supports watchers too). Vue is also very different from React, which (when I last used it) required components to implement shouldComponentUpdate. Vue does this at the cost of breaking compatibility with older browsers (which were not old at all when React and Angular 1.0 came out); I think the tradeoff is worth it.