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by RodgerTheGreat
5444 days ago
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Forth can be used to create 'if' statements from scratch, too. Many Forth implementations start up by loading a set of definitions for things like comments, conditionals and flow control. : IF COMPILE 0BRANCH HERE 0 , ; IMMEDIATE
: ELSE COMPILE BRANCH HERE SWAP 0 , HERE SWAP ! ; IMMEDIATE
: THEN HERE SWAP ! ; IMMEDIATE
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