Сделали useReducer для счетчика

src/App.jsx

@@ -1,67 +1,51 @@
-import React, { useState, useReducer, useRef, memo } from 'react'
+import { useState, useReducer } from 'react'
 
-function tasksReducer(state, action) {
+function counterReducer(state, action) {
-    switch(action.type) {
+    switch (action.type) {
-        case 'ADD_TASK':
+        case 'increment':
-            return [...state, action.payload]
+            return state + 1
-        case 'TOGGLE_TASK':
+        case 'decrement':
-            return state.map(task => task.id === action.payload ? {...task, complite: !task.complite} : task)
+            return state - 1
-        case 'REMOVE_TASK':
+        case 'reset':
-            return state.filter(task => task.id !== action.payload)
+            return 0
+        case 'set_value':
+            return action.value
         default:
             return state
     }
 }
 
-const TaskList = memo(function TaskList({tasks, onToggle, onRemove}) {
+function Counter() {
-    console.log("Rendred")
+    const [count, dispatch] = useReducer(counterReducer,0);
+    
     return (
-        <ul>
+        <div>
-        {tasks.map(({id, text, complite}) => (
+            <span>Счетчик: {count}</span>
-                <li key={id}
+            <button onClick={()=> dispatch({type: 'increment'})}>+</button>
-                    style={{textDecoration: complite ? 'line-through' : 'none' }}>
+            <button onClick={()=> dispatch({type: 'decrement'})}>-</button>
-                    <input type="checkbox" checked={complite} onChange={()=>onToggle(id)} />
+            <button onClick={()=> dispatch({type: 'reset'})}>reset</button>
-                    {text}
+            <button onClick={()=> dispatch({type: 'set_value', value: 5})}>set 5</button>
-                    <button onClick={()=> onRemove(id)} style={{marginLeft: 10}}>
+        </div>
-                        Удалить
-                    </button>
-                </li>
-            ))}
-        </ul>
     )
-})
+}
 
 function App() {
-    const [tasks, dispatch] = useReducer(tasksReducer,[])
+    const [tasks, setTasks] = useState([])
-    const [input,setInput] = useState('')
+    const [filter, setFilter] = useState('all')
-    const [error,setError] = useState('')
+    const [sortBy,setSortBy] = useState('date')
-    const inputRef = useRef(null)
     
-    const addTask = () => {
+    const addTask = newTask => {
-        if (input.trim() === '') {
+        setTasks([...tasks,newTask])
-            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>
+			{/* Добавьте тестовый контент для проверки */}
-			<input ref={inputRef} value={input} onChange={e => setInput(e.target.value)} />
+			<h1>Hello, React!</h1>
-			<button onClick={addTask}>Добавить</button>
+            <Counter />
-            {error && <p style={{color: 'red'}}>{error}</p>}
+		</>
-            
-            <TaskList tasks={tasks} 
-                onToggle={id => dispatch({type: 'TOGGLE_TASK', payload: id})}
-                onRemove={id => dispatch({type: 'REMOVE_TASK', payload: id})} />
-		</div>
 	)
 }
 

src/App.module.scss

@@ -0,0 +1,15 @@
+.container {
+/*    display: flex;
+    flex-direction: column;
+    flex-wrap: nowrap;*/
+    height: 500px;
+    overflow: auto;
+    border: 1px solid black;
+}
+.item {
+    font-size: 16pt;
+    border: 1px dotted gray;
+    /*margin: 5px 10px;
+    padding: 10px;*/
+    border-radius: 5px;
+}