Inheritance/Single: Difference between revisions
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Add Racket example |
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setClass("Collie", representation(), prototype(), contains="Dog") |
setClass("Collie", representation(), prototype(), contains="Dog") |
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setClass("Lab", representation(), prototype(), contains="Dog")</lang> |
setClass("Lab", representation(), prototype(), contains="Dog")</lang> |
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=={{header|Racket}}== |
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<lang racket> |
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#lang racket |
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(define animal% (class object% (super-new))) |
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(define dog% (class animal% (super-new))) |
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(define cat% (class animal% (super-new))) |
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(define lab% (class dog% (super-new))) |
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(define collie% (class dog% (super-new))) |
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;; unit tests |
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(require rackunit) |
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(check-true (is-a? (new dog%) animal%)) |
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(check-false (is-a? (new collie%) cat%)) |
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</lang> |
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=={{header|REBOL}}== |
=={{header|REBOL}}== |
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