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site/src/components/ReactCounter.jsx

@@ -0,0 +1,15 @@
+import { useState } from 'react';
+
+export default function ReactCounter() {
+  const [count, setCount] = useState(0);
+  const add = () => setCount((i) => i + 1);
+  const subtract = () => setCount((i) => i - 1);
+
+  return (
+    <div id="react" className="counter">
+      <button onClick={subtract}>-</button>
+      <pre>{count}</pre>
+      <button onClick={add}>+</button>
+    </div>
+  );
+}