Reitter: Answering the question: "How do I develop an app for GNOME?"

Let has nothing to do with immutability, you can use set! to modify a let binding. The point of let is that you can give a value a name within an expression. (f (let ((a 0)) a)) is valid scheme. f(var a = 1; a) is not valid JavaScript. The whole idea of separating expressions and statements is completely backwards.

That said, I wouldn't like to program in scheme either. Syntax does matter and I also want a good static type system.