40 lines
872 B
Factor
40 lines
872 B
Factor
! (c)2009 Joe Groff bsd license
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USING: kernel math tools.test variants ;
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IN: variants.tests
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VARIANT: list
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nil
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cons: { { first object } { rest list } }
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;
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[ t ] [ nil list? ] unit-test
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[ t ] [ 1 nil <cons> list? ] unit-test
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[ f ] [ 1 list? ] unit-test
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: list-length ( list -- length )
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{
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{ nil [ 0 ] }
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{ cons [ nip list-length 1 + ] }
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} match ;
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[ 4 ]
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[ 5 6 7 8 nil <cons> <cons> <cons> <cons> list-length ] unit-test
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VARIANT: list2 ;
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VARIANT-MEMBER: list2 nil2
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VARIANT-MEMBER: list2 cons2: { { first object } { rest list2 } }
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[ t ] [ nil2 list2? ] unit-test
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[ t ] [ 1 nil2 <cons2> list2? ] unit-test
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[ f ] [ 1 list2? ] unit-test
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: list2-length ( list2 -- length )
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{
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{ nil2 [ 0 ] }
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{ cons2 [ nip list2-length 1 + ] }
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} match ;
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[ 4 ]
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[ 5 6 7 8 nil2 <cons2> <cons2> <cons2> <cons2> list2-length ] unit-test
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