From 8eabc23a45d02532157257a0e004239db8ca9fbc Mon Sep 17 00:00:00 2001
From: earncef <earncef@earncef.com>
Date: Tue, 9 Apr 2019 04:52:37 +0200
Subject: [PATCH] Fixed runtime error when iterating over undefined. (#177)

---
 objects/undefined.go | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/objects/undefined.go b/objects/undefined.go
index 79a380f..0fdbc08 100644
--- a/objects/undefined.go
+++ b/objects/undefined.go
@@ -40,3 +40,23 @@ func (o *Undefined) Equals(x Object) bool {
 func (o *Undefined) IndexGet(index Object) (Object, error) {
 	return UndefinedValue, nil
 }
+
+// Iterate creates a map iterator.
+func (o *Undefined) Iterate() Iterator {
+	return o
+}
+
+// Next returns true if there are more elements to iterate.
+func (o *Undefined) Next() bool {
+	return false
+}
+
+// Key returns the key or index value of the current element.
+func (o *Undefined) Key() Object {
+	return o
+}
+
+// Value returns the value of the current element.
+func (o *Undefined) Value() Object {
+	return o
+}