having to add one extra node for the variable declaration feels cumbersome Well you don't always have to define a variable. For example `=sum()`in a node will just take all the parent values and sum them, whether they are variables or just pure values.

But you're right that if you want to define a variable its takes two nodes (the expression as the parent, then the `var foo` as the child). I should probably support defining a variable completely inside a node like `var foo = 1 + 2`.

I'm still a little hesitant to add any text on the arrows until I find a better way to do it via the keyboard. I find that just using the text in the nodes is usually sufficient anyways.