diff --git a/contains-duplicate/seona926.js b/contains-duplicate/seona926.js
new file mode 100644
index 000000000..2721c3e59
--- /dev/null
+++ b/contains-duplicate/seona926.js
@@ -0,0 +1,16 @@
+/**
+ * @param {number[]} nums
+ * @return {boolean}
+ */
+let containsDuplicate = function (nums) {
+  let counts = {};
+
+  return nums.some((num) => {
+    if (counts[num] === undefined) {
+      counts[num] = 1;
+      return false;
+    } else {
+      return true;
+    }
+  });
+};