22 lines
570 B
Factor
22 lines
570 B
Factor
USING: math tools.test classes.algebra ;
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IN: classes.predicate
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PREDICATE: negative < integer 0 < ;
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PREDICATE: positive < integer 0 > ;
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[ t ] [ negative integer class< ] unit-test
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[ t ] [ positive integer class< ] unit-test
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[ f ] [ integer negative class< ] unit-test
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[ f ] [ integer positive class< ] unit-test
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[ f ] [ negative negative class< ] unit-test
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[ f ] [ positive negative class< ] unit-test
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GENERIC: abs ( n -- n )
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M: integer abs ;
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M: negative abs -1 * ;
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M: positive abs ;
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[ 10 ] [ -10 abs ] unit-test
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[ 10 ] [ 10 abs ] unit-test
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[ 0 ] [ 0 abs ] unit-test
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