From 7501a69736a3fb2b9faa18b8258bb07168815de7 Mon Sep 17 00:00:00 2001
From: koronya <koronya@hanmail.net>
Date: Thu, 7 May 2026 23:39:50 +0900
Subject: [PATCH] [JS][7kyu] Are they square?

---
 codewars/7kyu/are-they-square/koronya.js | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 codewars/7kyu/are-they-square/koronya.js

diff --git a/codewars/7kyu/are-they-square/koronya.js b/codewars/7kyu/are-they-square/koronya.js
new file mode 100644
index 000000000..325b07ac4
--- /dev/null
+++ b/codewars/7kyu/are-they-square/koronya.js
@@ -0,0 +1,18 @@
+// [JS][7kyu] Are they square?
+// are-they-square
+// https://www.codewars.com/kata/56853c44b295170b73000007/train/javascript
+
+const isSquare = (arr) => {
+  if (arr.length === 0) {
+    return undefined
+  }
+  return arr.every((num) => {
+    const sqrt = Math.sqrt(num)
+    return sqrt === Math.floor(sqrt)
+  })
+}
+
+isSquare([1, 4, 9, 16, 25, 36]) === true
+isSquare([1, 2, 3, 4, 5, 6]) === false
+isSquare([]) === undefined
+isSquare([1, 2, 4, 15]) === false