diff --git a/codewars/7kyu/reverser/koronya.js b/codewars/7kyu/reverser/koronya.js
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+++ b/codewars/7kyu/reverser/koronya.js
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+// [JS][7kyu] Reverser
+// reverser
+// https://www.codewars.com/kata/58069e4cf3c13ef3a6000168/train/javascript
+
+const reverse = (n) => {
+  const length = Math.ceil(Math.log10(n))
+  let flag = length - 1
+  const arr = []
+  while (flag >= 0) {
+    const num = Math.floor(n / 10 ** flag)
+    arr.push(num)
+    n -= num * 10 ** flag
+    flag -= 1
+  }
+
+  return arr.map((item, index) => item * 10 ** index).reduce((acc, curr) => acc + curr, 0)
+}
+
+// reverse(1234) === 4321
+// reverse(10987) === 78901
+// reverse(1020) === 201