Inheritance/Single: Difference between revisions
Content deleted Content added
Add Racket example |
|||
Line 1,144:
setClass("Collie", representation(), prototype(), contains="Dog")
setClass("Lab", representation(), prototype(), contains="Dog")</lang>
=={{header|Racket}}==
<lang racket>
#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%))
</lang>
=={{header|REBOL}}==
| |||