2 files changed, 10 insertions, 1 deletions
diff --git a/skate/set/set.go b/skate/set/set.go
index a198094..6bad47e 100644
--- a/skate/set/set.go
+++ b/skate/set/set.go
@@ -5,9 +5,15 @@ import (
 	"strings"
 )
 
-// Set implements basic string set operations.
+// Set implements basic string set operations, not thread-safe.
 type Set map[string]struct{}
 
+func (s *Set) Clear() {
+	for k := range *s {
+		delete(*s, k)
+	}
+}
+
 // Add adds an element.
 func (s *Set) Add(v string) *Set {
 	(*s)[v] = struct{}{}
diff --git a/skate/set/set_test.go b/skate/set/set_test.go
index c319759..403b6df 100644
--- a/skate/set/set_test.go
+++ b/skate/set/set_test.go
@@ -36,4 +36,7 @@ func TestSet(t *testing.T) {
 	top.Add("2")
 	top.Add("3")
 	is.Equal(r.TopK(2), &top)
+
+	r.Clear()
+	is.Equal(r.Len(), 0)
 }