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12
Task/History-variables/Factor/history-variables.factor
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12
Task/History-variables/Factor/history-variables.factor
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USING: accessors combinators formatting kernel models.history ;
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1 <history> {
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[ add-history ]
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[ value>> "Initial value: %u\n" printf ]
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[ 2 >>value add-history ]
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[ 3 swap value<< ]
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[ value>> "Current value: %u\n" printf ]
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[ go-back ]
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[ go-back ]
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[ value>> "Restored value: %u\n" printf ]
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} cleave
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