All VDOM systems are. The difference is how explicit the data binding is: I maintain implicit 2-way binds, Angluar style, are a Bad Idea.

Mmm no sorry i don't agree. For me virtual dom is only a tree generated from code,diffed and batched. Speaking only of the algoritm. For me databining templates libraries are vue and ractive. See this 2 links for comparison. https://vuejs.org/guide/comparison.html

http://blog.ractivejs.org/posts/whats-the-difference-between...

That's true, but what I meant was that all VDOM based systems have binding to some degree, and where optimization is required, explicit is better than implicit.