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factor
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add ?first2

db4
Doug Coleman 2008-02-11 16:21:16 -06:00
parent 04dc25f87a
commit 8db19c2ee5
1 changed files with 4 additions and 0 deletions
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extra/sequences/lib/lib.factor
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@ -178,6 +178,10 @@ PRIVATE>
: ?third ( seq -- third/f ) 2 swap ?nth ; inline
: ?fourth ( seq -- fourth/f ) 3 swap ?nth ; inline
: ?first2 ( seq -- 1st/f 2nd/f ) dup ?first swap ?second ; inline
: ?first3 ( seq -- 1st/f 2nd/f 3rd/f ) dup ?first2 rot ?third ; inline
: ?first4 ( seq -- 1st/f 2nd/f 3rd/f 4th/f ) dup ?first3 roll ?fourth ; inline
: accumulator ( quot -- quot vec )
V{ } clone [ [ push ] curry compose ] keep ;