Add count controller

assets/js/controllers/count_controller.js

@@ -0,0 +1,35 @@
+import { Controller } from "@hotwired/stimulus";
+
+export default class extends Controller {
+  static targets = ["result"];
+
+  static values = {
+    count: Number,
+  };
+
+  connect() {
+    console.log("count#connect");
+
+    this.resultTarget.textContent = this.countValue;
+  }
+
+  countValueChanged() {
+    console.log("count#countValueChanged");
+
+    this.resultTarget.textContent = this.countValue;
+  }
+
+  decrement() {
+    console.log("count#decrement");
+
+    if (this.countValue > 0) {
+      this.countValue = this.countValue - 1;
+    }
+  }
+
+  increment() {
+    console.log("count#increment");
+
+    this.countValue = this.countValue + 1;
+  }
+}