add accumulator

2008-02-01 22:46:32 -06:00 · 2008-02-01 22:46:32 -06:00 · 004dd0dc5e
parent db3ac4d75f
commit 004dd0dc5e
1 changed files with 3 additions and 0 deletions
--- a/extra/sequences/lib/lib.factor
+++ b/extra/sequences/lib/lib.factor
@ -140,3 +140,6 @@ PRIVATE>
 : ?second ( seq -- second/f ) 1 swap ?nth ; inline
 : ?third ( seq -- third/f ) 2 swap ?nth ; inline
 : ?fourth ( seq -- fourth/f ) 3 swap ?nth ; inline
+
+: accumulator ( quot -- quot vec )
+    V{ } clone [ [ push ] curry compose ] keep ;