The layout system is declarative (with escape hatch to looping and conditionals), and so is the finite state machine syntax DSL inside, and the regular expression syntax (a novel reformulation).

But the nicest feature, invisible in the syntax because it is a property of the runtime under the hood, is that when you change your mutable state, any layout that used those variables is automatically scheduled for refresh. You thus declare what is on the screen, and how it is arrange, and the system knows what to do. In this sense it more like SQL, where you give it a goal, and don't specify the ordering of how to achieve the task.

There are also mini-solvers built into the language for the common tasks of solving for rectangles and points, which are quite handy.

Please take it for a spin, you might like it!