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
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+++ 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