🧪 improve playground by adding an examples abstraction

playground/examples.ts

@@ -0,0 +1,29 @@
+class Examples {
+    #examples: Function[] = [];
+    #only: Function[] = [];
+
+    constructor() {
+        window.addEventListener(
+            "load",
+            () => {
+                if (this.#only.length > 0) {
+                    this.#only.forEach((fn) => fn());
+                } else {
+                    this.#examples.forEach((fn) => fn());
+                }
+            },
+            { once: true },
+        );
+    }
+
+    make(fn: () => void): void {
+        this.#examples.push(fn);
+    }
+
+    only(fn: () => void): void {
+        this.#only.push(fn);
+    }
+}
+
+const examples = new Examples();
+export default examples;