diff --git a/codewars/7kyu/playing-with-sets-sup-sub/koronya.js b/codewars/7kyu/playing-with-sets-sup-sub/koronya.js
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+++ b/codewars/7kyu/playing-with-sets-sup-sub/koronya.js
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+// [JS][7kyu] Playing with Sets : Sup/Sub
+// playing-with-sets-sup-sub
+// https://www.codewars.com/kata/5885424265fc9c38100017ef/train/javascript
+
+const isSubsetOf = (s1, s2) => [...s1].every((item) => s2.has(item))
+const isSupersetOf = (s1, s2) => isSubsetOf(s2, s1)
+
+const s1 = new Set([1, 2])
+const s2 = new Set([1, 2, 3])
+
+isSubsetOf(s1, s2) // true
+isSupersetOf(s2, s1) // true
+isSubsetOf(s2, s1) // false
+isSupersetOf(s1, s2) // false