add task solution

src/App.tsx

@@ -1,7 +1,27 @@
-import React from 'react';
+import React, { useState, useEffect, useCallback } from 'react';
 
-export const App: React.FC = () => (
-  <div className="App">
-    <p className="App__message">The last pressed key is [Enter]</p>
-  </div>
-);
+export const App: React.FC = () => {
+  const [keyPress, setKeyPress] = useState<string | null>(null);
+
+  const handleKeyPress = useCallback((event: KeyboardEvent) => {
+    setKeyPress(event.key);
+  }, []);
+
+  useEffect(() => {
+    document.addEventListener('keyup', handleKeyPress);
+
+    return () => {
+      document.removeEventListener('keyup', handleKeyPress);
+    };
+  });
+
+  return (
+    <div className="App">
+      <p className="App__message">
+        {keyPress
+          ? `The last pressed key is [${keyPress}]`
+          : 'Nothing was pressed yet'}
+      </p>
+    </div>
+  );
+};

src/App2.tsx

@@ -0,0 +1,35 @@
+import React from 'react';
+
+interface State {
+  keyPress: string | null;
+}
+
+export class App2 extends React.Component<State> {
+  state: Readonly<State> = {
+    keyPress: null,
+  };
+
+  componentDidMount(): void {
+    document.addEventListener('keyup', this.handleKeyPress);
+  }
+
+  componentWillUnmount(): void {
+    document.removeEventListener('keyup', this.handleKeyPress);
+  }
+
+  handleKeyPress = (event: KeyboardEvent) => {
+    this.setState({ keyPress: event.key });
+  };
+
+  render() {
+    return (
+      <div className="App">
+        <p className="App__message">
+          {this.state.keyPress
+            ? `The last pressed key is [${this.state.keyPress}]`
+            : 'Nothing was pressed yet'}
+        </p>
+      </div>
+    );
+  }
+}