Is functional GUI programming possible? [closed]

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The Haskell approach seems to be to just wrap imperative GUI toolkits (such as GTK+ or wxWidgets) and to use “do” blocks to simulate an imperative style

That’s not really the “Haskell approach” — that’s just how you bind to imperative GUI toolkits most directly — via an imperative interface. Haskell just happens to have fairly prominent bindings.

There are several moderately mature, or more experimental purely functional/declarative approaches to GUIs, mostly in Haskell, and primarily using functional reactive programming.

Some examples are:

For those of you not familiar with Haskell, Flapjax, http://www.flapjax-lang.org/ is an implementation of functional reactive programming on top of JavaScript.

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