sequences.extras: experimenting with take-while and drop-while.

[factor.git] / extra / sequences / extras / extras.factor

diff --git a/extra/sequences/extras/extras.factor b/extra/sequences/extras/extras.factor
index 8d2805473cbd0198f381e44334f91d35beb53ee7..1092be46b76ab1c9d38207bc5e529b08ba2d311e 100644 (file)
--- a/extra/sequences/extras/extras.factor
+++ b/extra/sequences/extras/extras.factor
@@ -602,3 +602,9 @@ PRIVATE>
 
 : map-values ( assoc quot: ( value -- value' ) -- assoc )
     '[ swap _ dip swap ] assoc-map ; inline
+
+: take-while ( ... seq quot: ( ... elt -- ... ? ) -- head-slice )
+    [ '[ @ not ] find drop ] 2keep drop swap 0 or head-slice ; inline
+
+: drop-while ( ... seq quot: ( ... elt -- ... ? ) -- tail-slice )
+    [ '[ @ not ] find drop ] 2keep drop swap 0 or tail-slice ; inline