diff --git a/codewars/7kyu/monkey-tennis-the-aftermath/koronya.js b/codewars/7kyu/monkey-tennis-the-aftermath/koronya.js
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+++ b/codewars/7kyu/monkey-tennis-the-aftermath/koronya.js
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+// [JS][7kyu] Monkey Tennis - The Aftermath
+// monkey-tennis-the-aftermath
+// https://www.codewars.com/kata/5a0c5b3206d5b696940000b8/train/javascript
+
+const TENNIS_BALL_WEIGHT = 58
+
+const ballCollector = (detritus) => {
+  const tennisBallLength = detritus.filter((item) => item === TENNIS_BALL_WEIGHT).length
+  return { weight: tennisBallLength * TENNIS_BALL_WEIGHT }
+}
+
+ballCollector([58, 68, 62, 69, 58])
+ballCollector([60, 66, 71, 68, 62])
+ballCollector([58])
+ballCollector([58, 58, 58])