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Creating Functional Forms

• Composition: the previous examples have used it

• Apply to All: one form in Scheme is mapcar

• Applies the given function to all elements of the given list; result is a list of the results

      (define (mapcar fun lis)
          (cond
              ((null? lis) '())
              (else (cons (fun (car lis)) 
                          (mapcar fun (cdr lis))))
          )
      )