diff --git a/two-sum/yoonthecoder.js b/two-sum/yoonthecoder.js
new file mode 100644
index 000000000..f37002549
--- /dev/null
+++ b/two-sum/yoonthecoder.js
@@ -0,0 +1,14 @@
+var twoSum = function (nums, target) {
+  const map = new Map();
+
+  for (let i = 0; i < nums.length; i++) {
+    const complement = target - nums[i];
+    if (map.has(complement)) {
+      return [map.get(complement), i];
+    }
+    map.set(nums[i], i);
+  }
+};
+
+// Time complexity: O(n)
+// Space complexity: O(n) - hash map storage