diff --git a/ts/lik.fastmap.ts b/ts/lik.fastmap.ts
index 60f4d0a..4ba8465 100644
--- a/ts/lik.fastmap.ts
+++ b/ts/lik.fastmap.ts
@@ -38,4 +38,8 @@ export class FastMap<T> {
     }
     return keys;
   }
+
+  public clean() {
+    this.mapObject = {};
+  }
 }