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Expands into a lambda that invokes the body following the first matching lambda-list.

(define plus
  (case-lambda 
    (() 0)
    ((x) x)
    ((x y) (+ x y))
    ((x y z) (+ (+ x y) z))
    (args (apply + args))))

(plus)                      ==> 0
(plus 1)                    ==> 1
(plus 1 2 3)                ==> 6

For more information see the documentation for SRFI-16

This special form is also compatible with the definition from the R7RS (scheme case-lambda) library.