From 8a222956c69af92cb21d5715375ffaa3bef30766 Mon Sep 17 00:00:00 2001
From: koronya <koronya@hanmail.net>
Date: Sun, 14 Jun 2026 19:15:41 +0900
Subject: [PATCH] [JS][7kyu] Clean Nesting Tree

---
 codewars/7kyu/clean-nesting-tree/koronya.js | 54 +++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 codewars/7kyu/clean-nesting-tree/koronya.js

diff --git a/codewars/7kyu/clean-nesting-tree/koronya.js b/codewars/7kyu/clean-nesting-tree/koronya.js
new file mode 100644
index 000000000..18bed17c6
--- /dev/null
+++ b/codewars/7kyu/clean-nesting-tree/koronya.js
@@ -0,0 +1,54 @@
+// [JS][7kyu] Clean Nesting Tree
+// clean-nesting-tree
+// https://www.codewars.com/kata/67c9c1cdf96c66388eb35cd4/train/javascript
+
+const isNested = (item) => item.length !== 0
+const isNotEqualArr = (arr) => new Set(arr).size > 1
+
+const isInvalidArr = (arr) => isNotEqualArr(arr.map((item) => isNested(item)))
+
+const isCleanlyNested = (xs) => {
+  const stack = []
+  stack.push(xs)
+  while (stack.length > 0) {
+    let arr = stack.shift()
+    if (!arr) {
+      continue
+    }
+    if (isInvalidArr(arr)) {
+      return false
+    }
+    arr.forEach((item) => stack.push(item))
+  }
+
+  return true
+}
+
+// isCleanlyNested([]) === true
+// isCleanlyNested([[], []]) === true
+// isCleanlyNested([
+//   [[], [], []],
+//   [[], [[]]],
+// ]) === false
+// isCleanlyNested([[[[[]], [[]]], [[]]], [[]]]) === true
+// isCleanlyNested([
+//   [
+//     [
+//       [[[], [], [], []], [[[[]], [[]], [[]]]]],
+//       [[], [], [], [], [], []],
+//     ],
+//   ],
+//   [[], [], [], []],
+// ]) === true
+// isCleanlyNested([[[], [], [], [], []]]) === true
+// isCleanlyNested([
+//   [
+//     [[], [], []],
+//     [[], [], []],
+//     [[], [], []],
+//     [[], [], [], [], [], []],
+//   ],
+// ]) === true
+// isCleanlyNested([[], [[], [[], [[], [], [], []], [[[], [], [], []], [], [], [[], [], [], [], [], []]], []], []], [], [], [], []]) === false
+// isCleanlyNested([[], [[], [], []], []]) === false
+// isCleanlyNested([[], [], [[], [[], [], [], []], [], []], [], [], []]) === false