1e90139a06b1

--- a/DOCUMENTATION.markdown	Wed Sep 27 20:03:21 2017 -0400
+++ b/DOCUMENTATION.markdown	Fri Oct 13 01:32:30 2017 -0400
@@ -1193,6 +1193,16 @@
 
   
 
+### `HSET-REDUCE` (function)
+
+    (HSET-REDUCE HSET FUNCTION &KEY (INITIAL-VALUE NIL IVP))
+
+Reduce `function` over the elements of `hset`.
+
+  The order in which the elements are processed is undefined.
+
+  
+
 ### `HSET-REMOVE!` (function)
 
     (HSET-REMOVE! HSET &REST ELEMENTS)

--- a/losh.lisp	Wed Sep 27 20:03:21 2017 -0400
+++ b/losh.lisp	Fri Oct 13 01:32:30 2017 -0400
@@ -2749,6 +2749,18 @@
     new))
 
 
+(define-hset-op hset-reduce (hset function &key (initial-value nil ivp))
+  "Reduce `function` over the elements of `hset`.
+
+  The order in which the elements are processed is undefined.
+
+  "
+  (if ivp
+    (iterate (for (n nil) :in-hashtable storage)
+             (reducing n by function :initial-value initial-value))
+    (iterate (for (n nil) :in-hashtable storage)
+             (reducing n by function))))
+
 (define-hset-op hset-elements (hset)
   "Return a fresh list containing the elements of `hset`."
   (hash-table-keys storage))

--- a/package.lisp	Wed Sep 27 20:03:21 2017 -0400
+++ b/package.lisp	Fri Oct 13 01:32:30 2017 -0400
@@ -154,7 +154,7 @@
     :hset-filter!
     :hset-map
     :hset-map!
-    ))
+    :hset-reduce))
 
 (defpackage :losh.hash-tables
   (:documentation "Utilities for operating on hash tables.")