15 lines
287 B
Factor
15 lines
287 B
Factor
USING: math tools.test ;
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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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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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