diff --git a/codewars/7kyu/number-to-digit-tiers/koronya.js b/codewars/7kyu/number-to-digit-tiers/koronya.js
new file mode 100644
index 000000000..d13d8aa07
--- /dev/null
+++ b/codewars/7kyu/number-to-digit-tiers/koronya.js
@@ -0,0 +1,16 @@
+// [JS][7kyu] Number to digit tiers
+// number-to-digit-tiers
+// https://www.codewars.com/kata/586bca7fa44cfc833e00005c/train/javascript
+
+const createArrayOfTiers = (num) => {
+  const arr = String(num).split('')
+  const arrLen = arr.length
+  const result = []
+  for (let i = 0; i < arrLen; i += 1 || 0) {
+    result.push([...arr].splice(0, i + 1).join(''))
+  }
+  return result
+}
+
+createArrayOfTiers(420)
+createArrayOfTiers(2017)