diff --git a/codewars/6kyu/doors-in-the-school/koronya.js b/codewars/6kyu/doors-in-the-school/koronya.js
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+++ b/codewars/6kyu/doors-in-the-school/koronya.js
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+// [JS][6kyu] Doors in the school
+// doors-in-the-school
+// https://www.codewars.com/kata/57c15d314677bb2bd4000017/train/javascript
+
+const doors = (n) => {
+  const arr = Array.from({ length: n }, () => false)
+  for (let i = 0; i < n; i += 1 || 0) {
+    let targetIndex = i
+    while (targetIndex < n) {
+      arr[targetIndex] = !arr[targetIndex]
+      targetIndex += i + 1
+    }
+  }
+  return arr.filter((door) => door).length
+}
+
+// doors(5) === 2
+// doors(10) === 3
+// doors(100) === 10