diff --git a/src/libecmaobjects/ecma-helpers-values-collection.c b/src/libecmaobjects/ecma-helpers-values-collection.c
index af40a435b..e5fa638de 100644
--- a/src/libecmaobjects/ecma-helpers-values-collection.c
+++ b/src/libecmaobjects/ecma-helpers-values-collection.c
@@ -147,6 +147,66 @@ ecma_new_strings_collection (ecma_string_t* string_ptrs_buffer[], /**< pointers
   return ecma_new_values_collection (values_buffer, strings_number, false);
 } /* ecma_new_strings_collection */
 
+/**
+ * Initialize new collection iterator for the collection
+ */
+void
+ecma_collection_iterator_init (ecma_collection_iterator_t *iterator_p, /**< context of iterator */
+                               ecma_collection_header_t *collection_p) /**< header of collection */
+{
+  iterator_p->header_p = collection_p;
+  iterator_p->next_chunk_cp = collection_p->next_chunk_cp;
+  iterator_p->current_index = 0;
+  iterator_p->current_value_p = NULL;
+  iterator_p->current_chunk_end_p = ((ecma_value_t*) iterator_p->header_p->data
+                                     + sizeof (iterator_p->header_p->data) / sizeof (ecma_value_t));
+} /* ecma_collection_iterator_init */
+
+/**
+ * Move collection iterator to next element if there is any.
+ *
+ * @return true - if iterator moved,
+ *         false - otherwise (current element is last element in the collection)
+ */
+bool
+ecma_collection_iterator_next (ecma_collection_iterator_t *iterator_p) /**< context of iterator */
+{
+  if (unlikely (iterator_p->header_p->unit_number == 0
+                || iterator_p->current_index + 1 == iterator_p->header_p->unit_number))
+  {
+    return false;
+  }
+
+  JERRY_ASSERT (iterator_p->current_index + 1 < iterator_p->header_p->unit_number);
+
+  if (iterator_p->current_value_p == NULL)
+  {
+    JERRY_ASSERT (iterator_p->current_index == 0);
+    iterator_p->current_value_p = (ecma_value_t*) iterator_p->header_p->data;
+
+    return true;
+  }
+
+  iterator_p->current_index++;
+  iterator_p->current_value_p++;
+
+  if (iterator_p->current_value_p == iterator_p->current_chunk_end_p)
+  {
+    ecma_collection_chunk_t *next_chunk_p = ECMA_GET_POINTER (iterator_p->next_chunk_cp);
+    JERRY_ASSERT (next_chunk_p != NULL);
+
+    iterator_p->next_chunk_cp = next_chunk_p->next_chunk_cp;
+    iterator_p->current_value_p = (ecma_value_t*) &next_chunk_p->data;
+    iterator_p->current_chunk_end_p = iterator_p->current_value_p + sizeof (next_chunk_p->data) / sizeof (ecma_value_t);
+  }
+  else
+  {
+    JERRY_ASSERT (iterator_p->current_value_p < iterator_p->current_chunk_end_p);
+  }
+
+  return true;
+} /* ecma_collection_iterator_next */
+
 /**
  * @}
  * @}
diff --git a/src/libecmaobjects/ecma-helpers.c b/src/libecmaobjects/ecma-helpers.c
index 722ed1253..49cdef0e8 100644
--- a/src/libecmaobjects/ecma-helpers.c
+++ b/src/libecmaobjects/ecma-helpers.c
@@ -491,28 +491,6 @@ ecma_delete_property (ecma_object_t *obj_p, /**< object */
   JERRY_UNREACHABLE();
 } /* ecma_delete_property */
 
-/**
- * Free all chunks of a collection
- */
-void
-ecma_free_collection (ecma_collection_header_t *collection_header_p) /**< header of collection */
-{
-  JERRY_ASSERT(collection_header_p != NULL);
-
-  ecma_collection_chunk_t *non_first_chunk_p = ECMA_GET_POINTER (collection_header_p->next_chunk_cp);
-
-  ecma_dealloc_collection_header (collection_header_p);
-
-  while (non_first_chunk_p != NULL)
-  {
-    ecma_collection_chunk_t *next_chunk_p = ECMA_GET_POINTER (non_first_chunk_p->next_chunk_cp);
-
-    ecma_dealloc_collection_chunk (non_first_chunk_p);
-
-    non_first_chunk_p = next_chunk_p;
-  }
-} /* ecma_free_collection */
-
 /**
  * Construct empty property descriptor.
  *
diff --git a/src/libecmaobjects/ecma-helpers.h b/src/libecmaobjects/ecma-helpers.h
index c79ec9ec8..e0ce63392 100644
--- a/src/libecmaobjects/ecma-helpers.h
+++ b/src/libecmaobjects/ecma-helpers.h
@@ -106,6 +106,26 @@ extern ecma_collection_header_t *ecma_new_values_collection (ecma_value_t values
 extern void ecma_free_values_collection (ecma_collection_header_t* header_p, bool do_deref_if_object);
 extern ecma_collection_header_t *ecma_new_strings_collection (ecma_string_t* string_ptrs_buffer[],
                                                               ecma_length_t strings_number);
+
+/**
+ * Context of ecma-values' collection iterator
+ */
+typedef struct
+{
+  ecma_collection_header_t *header_p; /**< collection header */
+  uint16_t next_chunk_cp; /**< compressed pointer to next chunk */
+  ecma_length_t current_index; /**< index of current element */
+  ecma_value_t *current_value_p; /**< pointer to current element */
+  ecma_value_t *current_chunk_beg_p; /**< pointer to beginning of current chunk's data */
+  ecma_value_t *current_chunk_end_p; /**< pointer to place right after the end of current chunk's data */
+} ecma_collection_iterator_t;
+
+extern void
+ecma_collection_iterator_init (ecma_collection_iterator_t *iterator_p,
+                               ecma_collection_header_t *collection_p);
+extern bool
+ecma_collection_iterator_next (ecma_collection_iterator_t *iterator_p);
+
 /* ecma-helpers.c */
 extern ecma_object_t* ecma_create_object (ecma_object_t *prototype_object_p,
                                           bool is_extensible,
@@ -147,8 +167,6 @@ extern void ecma_free_property (ecma_property_t *prop_p);
 
 extern void ecma_delete_property (ecma_object_t *obj_p, ecma_property_t *prop_p);
 
-extern void ecma_free_collection (ecma_collection_header_t *collection_header_p);
-
 extern ecma_property_descriptor_t ecma_make_empty_property_descriptor (void);
 
 #endif /* !JERRY_ECMA_HELPERS_H */