Re: Dynamic variable binding

[Kjetil S. Matheussen]

Sebastian Tennant:
> Hi all,
>
> An elementary scheme problem from an elementary schemer...
>
> I need to create multiple variable bindings from a list of symbols.  The
> value of the variables is unimportant.  It's the 'names' of the
> variables that matter.
>
> In pseudo-scheme code:
>
>  (map (lambda (v) (define (eval v) "foo") '(var1 var2 var3)))
>
> Clearly this won't work but I thought perhaps calling a macro in place
> of the 'define' would do it, but...

That's a common problem.
Maybe this is one good enough:

(define-macro (define-lotsof names value)
   `(begin
      ,@(map (lambda (name)
                `(define ,name ,value))
             names)))

(define-lotsof (a b c) "foo")

If not, you may need to play with local-eval or similar.