added examples of hooks and state components

Author: Daniel-Cross

src/App.css

@@ -1,25 +1,13 @@
-import React from 'react';
-import logo from './logo.svg';
-import './App.css';
+import React from "react";
+import MyStatefulComponent from "./components/state";
+import MyStatelessComponent from "./components/hooks";
 
 function App() {
   return (
-    <div className="App">
-      <header className="App-header">
-        <img src={logo} className="App-logo" alt="logo" />
-        <p>
-          Edit <code>src/App.js</code> and save to reload.
-        </p>
-        <a
-          className="App-link"
-          href="https://reactjs.org"
-          target="_blank"
-          rel="noopener noreferrer"
-        >
-          Learn React
-        </a>
-      </header>
-    </div>
+    <>
+      <MyStatefulComponent />
+      <MyStatelessComponent />
+    </>
   );
 }
 

src/App.js

@@ -0,0 +1,20 @@
+import React, { useState, useEffect } from "react";
+
+const MyStatelessComponent = () => {
+  const [count, setCount] = useState(0);
+
+  // Similar to componentDidMount and componentDidUpdate:
+  useEffect(() => {
+    // Update the document title using the browser API
+    document.title = `You clicked ${count} times`;
+  });
+
+  return (
+    <div>
+      <p>You clicked {count} times</p>
+      <button onClick={() => setCount(count + 1)}>Click me</button>
+    </div>
+  );
+};
+
+export default MyStatelessComponent;

src/components/hooks.js

@@ -0,0 +1,30 @@
+import React, { Component } from "react";
+
+class MyStatefulComponent extends Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      count: 0,
+    };
+  }
+
+  componentDidMount() {
+    document.title = `You clicked ${this.state.count} times`;
+  }
+  componentDidUpdate() {
+    document.title = `You clicked ${this.state.count} times`;
+  }
+
+  render() {
+    return (
+      <div>
+        <p>You clicked {this.state.count} times</p>
+        <button onClick={() => this.setState({ count: this.state.count + 1 })}>
+          Click me
+        </button>
+      </div>
+    );
+  }
+}
+
+export default MyStatefulComponent;