diff --git a/codewars/7kyu/evens-and-odds/koronya.js b/codewars/7kyu/evens-and-odds/koronya.js
new file mode 100644
index 000000000..df240f194
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+++ b/codewars/7kyu/evens-and-odds/koronya.js
@@ -0,0 +1,12 @@
+// [JS][7kyu] Evens and Odds
+// evens-and-odds
+// https://www.codewars.com/kata/583ade15666df5a64e000058/train/javascript
+
+const evensAndOdds = (num) => (num % 2 === 0 ? num.toString(2) : num.toString(16))
+
+evensAndOdds(2) === '10'
+evensAndOdds(13) === 'd'
+evensAndOdds(47) === '2f'
+evensAndOdds(0) === '0'
+evensAndOdds(12800) === '11001000000000'
+evensAndOdds(8172381723) === '1e71ca61b'