--- a/dowa/dowa.h	Mon Dec 15 19:55:17 2025 -0800
+++ b/dowa/dowa.h	Fri Dec 19 13:30:30 2025 -0800
@@ -54,6 +54,12 @@
 extern void  Dowa_Arena_Destroy(Dowa_PArena arena);
 /* Strdup but saves within the arena */
 extern void *Dowa_Arena_Copy(Dowa_PArena p_arena, const void *src, size_t size);
+/* Resets the arena offset to 0, allowing reuse without freeing */
+extern void  Dowa_Arena_Reset(Dowa_PArena p_arena);
+/* Returns the current number of bytes allocated in the arena */
+extern size_t Dowa_Arena_Get_Used(Dowa_PArena p_arena);
+/* Returns the remaining capacity in bytes */
+extern size_t Dowa_Arena_Get_Remaining(Dowa_PArena p_arena);
 
 
 // --- HashMap --- //
@@ -97,6 +103,12 @@
 extern int32         Dowa_HashMap_Push_Value_With_Type_NoCopy(Dowa_PHashMap p_hash_map, const char *key, void *value, size_t value_size, Dowa_HashMap_ValueType type);
 /* Removes the entry with the specified key from the hashmap and frees its data if owned. */
 extern void          Dowa_HashMap_Pop_Key(Dowa_PHashMap p_hash_map, const char *key);
+/* Returns TRUE if the key exists in the hashmap, FALSE otherwise. */
+extern boolean       Dowa_HashMap_Has_Key(Dowa_PHashMap p_hash_map, const char *key);
+/* Removes all entries from the hashmap without destroying it. */
+extern void          Dowa_HashMap_Clear(Dowa_PHashMap p_hash_map);
+/* Returns the number of entries currently in the hashmap. */
+extern uint32        Dowa_HashMap_Get_Count(Dowa_PHashMap p_hash_map);
 
 // --- Utility Functions --- //
 /* Prints all entries in the hashmap to stdout for debugging purposes. */