Add example for Singleton with private static

tshemsedinov · tshemsedinov · commit 5df731ecd1ba · 2025-04-28T11:44:33.000+03:00
diff --git a/JavaScript/8-class.js b/JavaScript/8-class.js
@@ -0,0 +1,16 @@
+'use strict';
+
+class Singleton {
+  static #instance;
+
+  constructor() {
+    const instance = Singleton.#instance;
+    if (instance) return instance;
+    Singleton.#instance = this;
+  }
+}
+
+// Usage
+
+console.assert(new Singleton() === new Singleton());
+console.log('instances are equal');
