added an cleanup to remove items

weightedrandom/weightedrandom.go

@@ -98,3 +98,14 @@ func (wr *WeightRandom[T]) Get() (t T) {
 	}
 	return
 }
+
+// Cleanup deletes the items where the the function returns true
+func (wr *WeightRandom[T]) Cleanup(f func(T) bool) {
+	nl := make(wflist[T], 0, wr.data.Len())
+	for _, item := range wr.data {
+		if !f(item.value) {
+			nl = append(nl, item)
+		}
+	}
+	wr.data = nl
+}