Сделали компонент с фотографией

src/App.jsx

@@ -1,82 +1,58 @@
-import memo, { useMemo, useCallback, useState } from 'react'
+import React from 'react'
 
-function MyComponent() {
+class RandomUser extends React.Component {
-    const [count, setCount] = useState(0);
+    constructor(props) {
-    const [name, setName] = useState('John');
+        super(props)
+        this.state = { user: {} }
+    }
     
-    const greeting = useMemo(() => `Hello, ${name}!`,[name]);
+    componentDidMount() {
+        fetch('https://randomuser.me/api')
+        .then(responce => responce.json())
+        .then(json => this.setState({ user: json.results[0] }));
+        console.log('смонтирован')
+    }
     
-    return (
+    componentDidUpdate(prevProps,prevState) {
-        <>
+        console.log(this.state);
-        <h2>{greeting}</h2>
+        console.log('Компонент обнвлен')
-        <button onClick={()=>setName('Alex')}>New name</button>
+    }
-        </>
-    )
-}
     
-function MyComponent2() {
+    componentWillUnmount() {
-    const [data,setData] = useState([{theme:'light'}])
+        console.log('Компонент таймера размонтирован')
-    const userPreferences = useMemo(()=>({theme: 'dark', language: 'en'}),[]);
+    }
     
-    const processData = useMemo(()=>{
+    render() {
-        return data.map(item => ({ ...item,theme: userPreferences.theme }))
+        return <div>
-    },[data, userPreferences]);
+            {this.state.user && 
-    console.log(processData);
+                this.state.user.name &&
-    return (
+                (
-        <>
+                <>
-            <h2 className={data.theme}>2</h2>
+                    <h2>{this.state.user.name.first} {this.state.user.name.last}</h2>
-            <button onClick={()=>setData(data)}>set new theme</button>
+                    <img src={this.state.user.picture.medium} />
-        </>
+                    <button onClick={() => {
-    )
+                        console.log('Загружаем ... ')
-}
+                        fetch('https://randomuser.me/api')
-
+                        .then(responce => responce.json())
-function MyComponent3() {
+                        .then(json => this.setState({ user: json.results[0] }));
-    const sum = useMemo(()=> a+b,[a,b]);//Бессмысленное применение и вредное
+                    }}>Загрузить нового</button>
-
+                </>
-    //Применение оправдано
+                )
-    const complexResult = useMemo(()=>{
+            }
-        return heavyMethOperations(largeDataSet);
+            </div>
-    },[largeDataSet])
+    }
-}
-
-function ParentComponent({ items }) {
-    const [filter, setFilter] = useState('');
-    
-    const listProps = useMemo(()=>({
-            items: items.filter(item => item.name.includes(filter)),
-            onItemClick: id => console.log('Clicked',id),
-            theme: 'dark'
-        }),[items,filter]);
-    
-    return (
-        <>
-        <Memoized {...listProps} />
-        <button onClick={()=>setFilter('Bob')}>Click</button>
-        </>
-    )
-}
-
-function Memoized(props) {
-    console.log(props);
-    return (
-        <>
-        <h3 className={props.theme}>Memoized</h3>
-        {props.items.map((item) => (
-         <>
-            <li>
-                {item.name}
-            </li>
-         </>))}
-        </>
-    )
 }
 
 function App() {
+    const [showClock, setShowClock] = React.useState(true);
+    
 	return (
 		<>
-			{/* Добавьте тестовый контент для проверки */}
+			<h1>Домашнее задание: жизненый цикл</h1>
-			<h1>Hello, React!</h1>
+            <button onClick={()=> setShowClock(!showClock)}>
-            <ParentComponent items={[{name:'Alex'},{name:'Bob'}]} />
+                {showClock ? 'Скрыть часы' : 'Показать часы' }
+            </button>
+            {showClock && <RandomUser />}
 		</>
 	)
 }