From e8ef3454880b92a5485a339b3b6fe7b64cfe5305 Mon Sep 17 00:00:00 2001
From: Lam Wei Lun <weilun.lam@gmail.com>
Date: Wed, 21 Jan 2026 19:35:12 +0800
Subject: Add length, clear, is_empty to Stack and Queue

---
 std/queue.zc            | 14 ++++++++++++--
 std/stack.zc            | 12 ++++++++++++
 tests/std/test_queue.zc | 14 ++++++++++++++
 tests/std/test_stack.zc | 14 ++++++++++++++
 4 files changed, 52 insertions(+), 2 deletions(-)

diff --git a/std/queue.zc b/std/queue.zc
index 2bbcfaa..31e5dbd 100644
--- a/std/queue.zc
+++ b/std/queue.zc
@@ -38,8 +38,6 @@ impl Queue<T> {
       self.cap = self.cap * 2;
       self.data = realloc(self.data, sizeof(T) * self.cap);
     }
-
-    // Assigns it at the back of 
     self.data[self.len] = value;
     self.len = self.len + 1;
   }
@@ -56,6 +54,18 @@ impl Queue<T> {
     }
     return Option<T>::None();
   }
+
+  fn length(self) -> usize {
+    return self.len;
+  }
+
+  fn clear(self) {
+    self.len = 0;
+  }
+
+  fn is_empty(self) -> bool {
+    return self.len == 0;
+  }
 }
 
 impl Drop for Queue<T> {
diff --git a/std/stack.zc b/std/stack.zc
index 3d7c3c5..7df77f1 100644
--- a/std/stack.zc
+++ b/std/stack.zc
@@ -50,6 +50,18 @@ impl Stack<T> {
     }
     return Option<T>::None();
   }
+
+  fn length(self) -> usize {
+    return self.len;
+  }
+
+  fn clear(self) {
+    self.len = 0;
+  }
+
+  fn is_empty(self) -> bool {
+    return self.len == 0;
+  }
 }
 
 impl Drop for Stack<T> {
diff --git a/tests/std/test_queue.zc b/tests/std/test_queue.zc
index 4d40c42..131eb05 100644
--- a/tests/std/test_queue.zc
+++ b/tests/std/test_queue.zc
@@ -28,6 +28,20 @@ test "Queue Push/Pop" {
   assert(v.is_none(), "v should not have a valid value");
 }
 
+test "Queue Length and Clear" {
+  print "Testing Queue clear";
+  var queue = Queue<i32>::new();
+  defer queue.free();
+
+  assert(queue.is_empty() && queue.length() == 0, "queue should be empty");
+
+  queue.push(123);
+  assert(!queue.is_empty() && queue.length() == 1, "queue should have 1 value");
+
+  queue.clear();
+  assert(queue.is_empty() && queue.length() == 0, "queue should be empty");
+}
+
 test "Queue Clone" {
   print "Testing Queue Cloning";
   var queue = Queue<i32>::new();
diff --git a/tests/std/test_stack.zc b/tests/std/test_stack.zc
index ecc9d3c..03e51a4 100644
--- a/tests/std/test_stack.zc
+++ b/tests/std/test_stack.zc
@@ -28,6 +28,20 @@ test "Stack Push/Pop" {
   assert(v.is_none(), "v should not have a valid value");
 }
 
+test "Stack Length and Clear" {
+  print "Testing Stack clear";
+  var stack = Stack<i32>::new();
+  defer stack.free();
+
+  assert(stack.is_empty() && stack.length() == 0, "Stack should be empty");
+
+  stack.push(123);
+  assert(!stack.is_empty() && stack.length() == 1, "Stack should have 1 value");
+
+  stack.clear();
+  assert(stack.is_empty() && stack.length() == 0, "Stack should be empty");
+}
+
 test "Stack Clone" {
   print "Testing Stack Cloning";
   var stack = Stack<i32>::new();
-- 
cgit v1.2.3