diff --git a/codewars/7kyu/operator-overload/koronya.js b/codewars/7kyu/operator-overload/koronya.js
new file mode 100644
index 000000000..398b30467
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+++ b/codewars/7kyu/operator-overload/koronya.js
@@ -0,0 +1,38 @@
+// [JS][7kyu] Operator overload ?
+// operator-overload
+// https://www.codewars.com/kata/52a0849a852a854d050005f4/train/javascript
+
+class Foo {
+  constructor(value) {
+    this.val = value
+  }
+
+  [Symbol.toPrimitive](hint) {
+    if (hint === 'number') {
+      return this.val
+    }
+    if (hint === 'string') {
+      return String(this.val)
+    }
+    return this.val
+  }
+}
+
+// const Foo = function (value) {
+//   this.val = value
+// }
+
+// Foo.prototype[Symbol.toPrimitive] = function (hint) {
+//   if (hint === 'number') {
+//     return this.val
+//   }
+//   if (hint === 'string') {
+//     return String(this.val)
+//   }
+//   return this.val
+// }
+
+new Foo(2) + new Foo(3) === 5
+new Foo(-2) + new Foo(3) === 1
+new Foo(-21) + new Foo(-7) === -28
+new Foo(1.5) + new Foo(0.2) === 1.7