From ed6af9350c97e817655c2e8f938c4bccb5c231b8 Mon Sep 17 00:00:00 2001
From: rrbharath <ryanrbharath@gmail.com>
Date: Tue, 28 Jul 2026 17:14:31 -0400
Subject: [PATCH] Add Dart solution for Single Number

---
 dart/single_number.dart | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 dart/single_number.dart

diff --git a/dart/single_number.dart b/dart/single_number.dart
new file mode 100644
index 0000000..dd0525e
--- /dev/null
+++ b/dart/single_number.dart
@@ -0,0 +1,17 @@
+/*
+Given a non-empty array of integers nums, every element appears twice except for one. Find that single one.
+
+You must implement a solution with a linear runtime complexity and use only constant extra space.
+*/
+
+class Solution {
+  int singleNumber(List<int> nums) {
+    int ans = 0;
+
+    for (final int num in nums) {
+      ans ^= num;
+    }
+
+    return ans;
+  }
+}