diff --git a/static/js/DOICache.js b/static/js/DOICache.js
index a6af9435..3041a404 100644
--- a/static/js/DOICache.js
+++ b/static/js/DOICache.js
@@ -33,4 +33,8 @@ class DOICache{
   get size(){
     return this._doimap.size()
   }
+  keys() { return this._doimap.keys()}
+  values() { return this._doimap.values()}
+  entries() { return this._doimap.entries()}
+  [Symbol.iterator]() { return this.values()}
 }
\ No newline at end of file