From fe2042864c6ac4b9a64f2b0be893724b785fd39e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=88=B1=E7=89=B9=E6=AF=8F=E7=BE=8A=E9=98=9F?=
 <t2026104239910027@eduxiji.net>
Date: Sat, 27 Jun 2026 13:22:45 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E5=AE=9E=E7=8E=B0=20Object/Array=20?=
 =?UTF-8?q?=E7=9A=84=20toString=20=E4=B8=8E=20valueOf?=
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---
 crates/oxide_builtins/src/array.rs  |  6 ++++++
 crates/oxide_builtins/src/object.rs | 12 ++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/crates/oxide_builtins/src/array.rs b/crates/oxide_builtins/src/array.rs
index 66c123e..8dd0ad1 100644
--- a/crates/oxide_builtins/src/array.rs
+++ b/crates/oxide_builtins/src/array.rs
@@ -342,6 +342,12 @@ pub fn array_join<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
     NativeResult::Ok(result_val)
 }
 
+pub fn array_to_string<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
+    // Array.prototype.toString() delegates to join with the default "," separator,
+    // ignoring its own arguments per spec.
+    array_join(vm, &[args[0]])
+}
+
 pub fn array_index_of<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
     builtins_debug!("Array.prototype.indexOf called with {} args", args.len());
     let arr_ptr = array_ptr!(vm, args);
diff --git a/crates/oxide_builtins/src/object.rs b/crates/oxide_builtins/src/object.rs
index 8758769..654d78f 100644
--- a/crates/oxide_builtins/src/object.rs
+++ b/crates/oxide_builtins/src/object.rs
@@ -459,6 +459,18 @@ pub fn object_has_own<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
     NativeResult::Ok(JsValue::bool(vm.get_own_property_slot(obj, key_si).is_some()))
 }
 
+pub fn object_proto_value_of<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
+    // Object.prototype.valueOf returns the `this` object unchanged; OrdinaryToPrimitive
+    // then falls through to toString since the result is not primitive.
+    NativeResult::Ok(vm.reg(args[0]))
+}
+
+pub fn object_proto_to_string<H: VmHost>(vm: &mut H, _args: &[u8]) -> NativeResult {
+    // ponytail: minimal [[Class]] string — always "[object Object]". Type-specific
+    // tags ("[object Array]" etc.) and Symbol.toStringTag are a later refinement.
+    NativeResult::Ok(vm.new_string("[object Object]"))
+}
+
 pub fn object_proto_has_own_property<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
     if args.len() < 2 {
         return NativeResult::Ok(JsValue::bool(false));