final

src/App.jsx

@@ -1,50 +1,32 @@
-import { memo, useState, useMemo } from 'react'
+import React, { useMemo, useCallback, useState } from 'react'
 
-function memoize(fn) {
+const TodoItem = React.memo(({ item, onToggle, onDelete }) => {
-    const cache = new Map();
+    console.log(`rendred ${item.id}`);
-    return function(...args) {
+    return <li>
-        const key = JSON.stringify(args);
+            {item.name}
-        if (cache.has(key)) {
+            <button onClick={() => onToggle(item.id)}>Done</button>
-            return cache.get(key);
+            <button onClick={() => onDelete(item.id)}>remove</button>
-        }
+        </li>
-        const result = fn.apply(this, args);
+})
-        cache.set(key,result);
-        return result;
-    }
-}
 
-function fibonachi(n, memo={}) {
+function ItemList({ items }) {
-    if (n in memo) {console.log(n);return memo[n];}
-    if (n <= 1) return 1;
-    memo[n] = fibonachi(n-1, memo) + fibonachi(n - 2, memo);
-    return memo[n];
-}
 
-const MyComponent = ({ value }) => {
+    const handleToggle = useCallback(id => {
-    console.log('Rendring');
+        items.done = true;
-    return <div>{value}</div>
+        console.log(`Item ${id} done`)
-}
+        console.log(id)
-
+    },[]);
-const MemoizedComponent = memo(MyComponent);
-
-const Child = memo(({ children }) => {
-    console.log('Child component rendred');
-    return <div>{children}</div>;
-});
-
-const Parent = () => {
-    const [count,setCount] = useState(0);
-    const [text, setText] = useState('');
-    
-    const stableChild = useMemo(() => <span>Memo text</span>,[]);
     
+    const handleDelete = useCallback(id => {
+        items.pop(id);
+    },[]);
     return (
         <>
-            <Child>
+            <h3>List items</h3>
-                {stableChild}
+            {items.map(item => (
-            </Child>
+             <TodoItem key={item.id} item={item}
-            <input type="text" onChange={(e) => setText(e.target.value)} value={text} />
+              onToggle={handleToggle} onDelete={handleDelete} />
-            <button onClick={() => setCount(count + 1)}>Increment {count}</button>
+             ))}
         </>
     )
 }
@@ -52,9 +34,13 @@ const Parent = () => {
 function App() {
 	return (
 		<>
+			{/* Добавьте тестовый контент для проверки */}
 			<h1>Hello, React!</h1>
-            <Parent />
+            <ItemList items={[
-        </>
+                {id:1,name:'Первый',done:false},
+                {id:2,name:'Второй',done:false}
+            ]} />
+		</>
 	)
 }