Сделали компонент часов

src/App.jsx

@@ -1,67 +1,45 @@
-import React, { useState, useReducer, useRef, memo } from 'react'
+import React from 'react'
 
-function tasksReducer(state, action) {
+class Clock extends React.Component {
-    switch(action.type) {
+    constructor(props) {
-        case 'ADD_TASK':
+        super(props)
-            return [...state, action.payload]
+        this.state = { time: new Date().toLocaleTimeString() }
-        case 'TOGGLE_TASK':
-            return state.map(task => task.id === action.payload ? {...task, complite: !task.complite} : task)
-        case 'REMOVE_TASK':
-            return state.filter(task => task.id !== action.payload)
-        default:
-            return state
-    }
     }
     
-const TaskList = memo(function TaskList({tasks, onToggle, onRemove}) {
+    componentDidMount() {
-    console.log("Rendred")
+        this.timerId = setInterval(()=>{
-    return (
+            this.setState({ time: new Date().toLocaleTimeString() })
-        <ul>
+        }, 1000);
-        {tasks.map(({id, text, complite}) => (
+        console.log('Таймер смонтирован')
-                <li key={id}
+    }
-                    style={{textDecoration: complite ? 'line-through' : 'none' }}>
+    
-                    <input type="checkbox" checked={complite} onChange={()=>onToggle(id)} />
+    componentDidUpdate(prevProps,prevState) {
-                    {text}
+        console.log('Компонент обнвлен')
-                    <button onClick={()=> onRemove(id)} style={{marginLeft: 10}}>
+    }
-                        Удалить
+    
-                    </button>
+    componentWillUnmount() {
-                </li>
+        clearInterval(this.timerId)
-            ))}
+        console.log('Компонент таймера размонтирован')
-        </ul>
+    }
-    )
+    
-})
+    render() {
+        return <div>
+            <h2>Текущее время: {this.state.time}</h2>
+            </div>
+    }
+}
 
 function App() {
-    const [tasks, dispatch] = useReducer(tasksReducer,[])
+    const [showClock, setShowClock] = React.useState(true);
-    const [input,setInput] = useState('')
-    const [error,setError] = useState('')
-    const inputRef = useRef(null)
-    
-    const addTask = () => {
-        if (input.trim() === '') {
-            setError('Пустой текст задачи')
-            return
-        }
-        setError('')
-        dispatch({
-            type: 'ADD_TASK',
-            payload: {id: Date.now(), text: input.trim(), complite: false }
-        })
-        setInput('')
-        inputRef.current.focus()
-    }
     
 	return (
-		<div style={{padding: 20}}>
+		<>
-			<h1>Список дел</h1>
+			<h1>Жизненный цикл компонента часов</h1>
-			<input ref={inputRef} value={input} onChange={e => setInput(e.target.value)} />
+            <button onClick={()=> setShowClock(!showClock)}>
-			<button onClick={addTask}>Добавить</button>
+                {showClock ? 'Скрыть часы' : 'Показать часы' }
-            {error && <p style={{color: 'red'}}>{error}</p>}
+            </button>
-            
+            {showClock && <Clock />}
-            <TaskList tasks={tasks} 
+		</>
-                onToggle={id => dispatch({type: 'TOGGLE_TASK', payload: id})}
-                onRemove={id => dispatch({type: 'REMOVE_TASK', payload: id})} />
-		</div>
 	)
 }
 

src/main.jsx

@@ -4,7 +4,5 @@ import { createRoot } from 'react-dom/client'
 import App from './App.jsx'
 
 createRoot(document.getElementById('root')).render(
-	<StrictMode>
 		<App />
-	</StrictMode>
 )