sequences.extras: adding 2map!.

slavapestov · Aug 9, 2012 · 567b0ab · 567b0ab
1 parent bb3974e
commit 567b0ab
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/extra/sequences/extras/extras.factor b/extra/sequences/extras/extras.factor
@@ -230,3 +230,6 @@ PRIVATE>
 
 : 2map-into ( seq1 seq2 quot into -- )
     [ (2each) ] dip collect ; inline
+
+: 2map! ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... seq1 )
+    pick [ 2map-into ] keep ; inline