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A-M baby

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Ingy döt Net 2013-04-10 21:29:02 -07:00
parent 764da6cbbb
commit db842d013d
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Task/Inheritance-Single/Racket/inheritance-single.rkt Normal file
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#lang racket
(define animal% (class object% (super-new)))
(define dog% (class animal% (super-new)))
(define cat% (class animal% (super-new)))
(define lab% (class dog% (super-new)))
(define collie% (class dog% (super-new)))
;; unit tests
(require rackunit)
(check-true (is-a? (new dog%) animal%))
(check-false (is-a? (new collie%) cat%))