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Author SHA1 Message Date
laktionov-as ef33d16373 Сделали React.memo и React.useMemo 2026-05-21 21:33:02 +03:00
9 changed files with 48 additions and 758 deletions
-25
View File
@@ -1,25 +0,0 @@
{
"products": [
{
"id":1,
"name":"Кросовки Red & White 2025",
"brand":"NIKE",
"price":38.0,
"imageUrl":"./assets/images/sneakers-image.jpg"
},
{
"id":2,
"name":"Кросовки белые 2024",
"brand":"NIKE",
"price":40.0,
"imageUrl":"./assets/images/sneakers-image.jpg"
},
{
"id":3,
"name":"Sneakers Red & White 2025",
"brand":"NIKE",
"price":46.0,
"imageUrl":"./assets/images/sneakers-image.jpg"
}
]
}
-13
View File
@@ -5,19 +5,6 @@
<link rel="icon" type="image/svg+xml" href="/vite.svg" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Vite + React</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: Arial, Helvetica, sans-serif;
}
body {
background-color: rgb(249, 249, 249);
}
</style>
</head>
<body>
<div id="root"></div>
+2 -389
View File
@@ -9,9 +9,7 @@
"version": "0.0.0",
"dependencies": {
"react": "^19.1.0",
"react-dom": "^19.1.0",
"react-icons": "^5.5.0",
"sass-embedded": "^1.89.2"
"react-dom": "^19.1.0"
},
"devDependencies": {
"@eslint/js": "^9.25.0",
@@ -321,12 +319,6 @@
"node": ">=6.9.0"
}
},
"node_modules/@bufbuild/protobuf": {
"version": "2.5.2",
"resolved": "https://registry.npmjs.org/@bufbuild/protobuf/-/protobuf-2.5.2.tgz",
"integrity": "sha512-foZ7qr0IsUBjzWIq+SuBLfdQCpJ1j8cTuNNT4owngTHoN5KsJb8L9t65fzz7SCeSWzescoOil/0ldqiL041ABg==",
"license": "(Apache-2.0 AND BSD-3-Clause)"
},
"node_modules/@esbuild/aix-ppc64": {
"version": "0.25.5",
"resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.25.5.tgz",
@@ -1526,12 +1518,6 @@
"node": "^6 || ^7 || ^8 || ^9 || ^10 || ^11 || ^12 || >=13.7"
}
},
"node_modules/buffer-builder": {
"version": "0.2.0",
"resolved": "https://registry.npmjs.org/buffer-builder/-/buffer-builder-0.2.0.tgz",
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"license": "MIT/X11"
},
"node_modules/callsites": {
"version": "3.1.0",
"resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
@@ -1600,12 +1586,6 @@
"dev": true,
"license": "MIT"
},
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"version": "0.5.2",
"resolved": "https://registry.npmjs.org/colorjs.io/-/colorjs.io-0.5.2.tgz",
"integrity": "sha512-twmVoizEW7ylZSN32OgKdXRmo1qg+wT5/6C3xu5b9QsWzSFAhHLn2xd8ro0diCsKfCj1RdaTP/nrcW+vAoQPIw==",
"license": "MIT"
},
"node_modules/concat-map": {
"version": "0.0.1",
"resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
@@ -2058,6 +2038,7 @@
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"integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
"dev": true,
"license": "MIT",
"engines": {
"node": ">=8"
@@ -2073,12 +2054,6 @@
"node": ">= 4"
}
},
"node_modules/immutable": {
"version": "5.1.3",
"resolved": "https://registry.npmjs.org/immutable/-/immutable-5.1.3.tgz",
"integrity": "sha512-+chQdDfvscSF1SJqv2gn4SRO2ZyS3xL3r7IW/wWEEzrzLisnOlKiQu5ytC/BVNcS15C39WT2Hg/bjKjDMcu+zg==",
"license": "MIT"
},
"node_modules/import-fresh": {
"version": "3.3.1",
"resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.3.1.tgz",
@@ -2486,15 +2461,6 @@
"react": "^19.1.0"
}
},
"node_modules/react-icons": {
"version": "5.5.0",
"resolved": "https://registry.npmjs.org/react-icons/-/react-icons-5.5.0.tgz",
"integrity": "sha512-MEFcXdkP3dLo8uumGI5xN3lDFNsRtrjbOEKDLD7yv76v4wpnEq2Lt2qeHaQOr34I/wPN3s3+N08WkQ+CW37Xiw==",
"license": "MIT",
"peerDependencies": {
"react": "*"
}
},
"node_modules/react-refresh": {
"version": "0.17.0",
"resolved": "https://registry.npmjs.org/react-refresh/-/react-refresh-0.17.0.tgz",
@@ -2562,326 +2528,6 @@
"dev": true,
"license": "MIT"
},
"node_modules/rxjs": {
"version": "7.8.2",
"resolved": "https://registry.npmjs.org/rxjs/-/rxjs-7.8.2.tgz",
"integrity": "sha512-dhKf903U/PQZY6boNNtAGdWbG85WAbjT/1xYoZIC7FAY0yWapOBQVsVrDl58W86//e1VpMNBtRV4MaXfdMySFA==",
"license": "Apache-2.0",
"dependencies": {
"tslib": "^2.1.0"
}
},
"node_modules/sass-embedded": {
"version": "1.89.2",
"resolved": "https://registry.npmjs.org/sass-embedded/-/sass-embedded-1.89.2.tgz",
"integrity": "sha512-Ack2K8rc57kCFcYlf3HXpZEJFNUX8xd8DILldksREmYXQkRHI879yy8q4mRDJgrojkySMZqmmmW1NxrFxMsYaA==",
"license": "MIT",
"dependencies": {
"@bufbuild/protobuf": "^2.5.0",
"buffer-builder": "^0.2.0",
"colorjs.io": "^0.5.0",
"immutable": "^5.0.2",
"rxjs": "^7.4.0",
"supports-color": "^8.1.1",
"sync-child-process": "^1.0.2",
"varint": "^6.0.0"
},
"bin": {
"sass": "dist/bin/sass.js"
},
"engines": {
"node": ">=16.0.0"
},
"optionalDependencies": {
"sass-embedded-android-arm": "1.89.2",
"sass-embedded-android-arm64": "1.89.2",
"sass-embedded-android-riscv64": "1.89.2",
"sass-embedded-android-x64": "1.89.2",
"sass-embedded-darwin-arm64": "1.89.2",
"sass-embedded-darwin-x64": "1.89.2",
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"sass-embedded-linux-arm64": "1.89.2",
"sass-embedded-linux-musl-arm": "1.89.2",
"sass-embedded-linux-musl-arm64": "1.89.2",
"sass-embedded-linux-musl-riscv64": "1.89.2",
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"sass-embedded-linux-x64": "1.89.2",
"sass-embedded-win32-arm64": "1.89.2",
"sass-embedded-win32-x64": "1.89.2"
}
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"resolved": "https://registry.npmjs.org/sass-embedded-win32-x64/-/sass-embedded-win32-x64-1.89.2.tgz",
"integrity": "sha512-cS2j5ljdkQsb4PaORiClaVYynE9OAPZG/XjbOMxpQmjRIf7UroY4PEIH+Waf+y47PfXFX9SyxhYuw2NIKGbEng==",
"cpu": [
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],
"license": "MIT",
"optional": true,
"os": [
"win32"
],
"engines": {
"node": ">=14.0.0"
}
},
"node_modules/sass-embedded/node_modules/supports-color": {
"version": "8.1.1",
"resolved": "https://registry.npmjs.org/supports-color/-/supports-color-8.1.1.tgz",
"integrity": "sha512-MpUEN2OodtUzxvKQl72cUF7RQ5EiHsGvSsVG0ia9c5RbWGL2CI4C7EpPS8UTBIplnlzZiNuV56w+FuNxy3ty2Q==",
"license": "MIT",
"dependencies": {
"has-flag": "^4.0.0"
},
"engines": {
"node": ">=10"
},
"funding": {
"url": "https://github.com/chalk/supports-color?sponsor=1"
}
},
"node_modules/scheduler": {
"version": "0.26.0",
"resolved": "https://registry.npmjs.org/scheduler/-/scheduler-0.26.0.tgz",
@@ -2957,27 +2603,6 @@
"node": ">=8"
}
},
"node_modules/sync-child-process": {
"version": "1.0.2",
"resolved": "https://registry.npmjs.org/sync-child-process/-/sync-child-process-1.0.2.tgz",
"integrity": "sha512-8lD+t2KrrScJ/7KXCSyfhT3/hRq78rC0wBFqNJXv3mZyn6hW2ypM05JmlSvtqRbeq6jqA94oHbxAr2vYsJ8vDA==",
"license": "MIT",
"dependencies": {
"sync-message-port": "^1.0.0"
},
"engines": {
"node": ">=16.0.0"
}
},
"node_modules/sync-message-port": {
"version": "1.1.3",
"resolved": "https://registry.npmjs.org/sync-message-port/-/sync-message-port-1.1.3.tgz",
"integrity": "sha512-GTt8rSKje5FilG+wEdfCkOcLL7LWqpMlr2c3LRuKt/YXxcJ52aGSbGBAdI4L3aaqfrBt6y711El53ItyH1NWzg==",
"license": "MIT",
"engines": {
"node": ">=16.0.0"
}
},
"node_modules/tinyglobby": {
"version": "0.2.14",
"resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.14.tgz",
@@ -2995,12 +2620,6 @@
"url": "https://github.com/sponsors/SuperchupuDev"
}
},
"node_modules/tslib": {
"version": "2.8.1",
"resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
"integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
"license": "0BSD"
},
"node_modules/type-check": {
"version": "0.4.0",
"resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
@@ -3055,12 +2674,6 @@
"punycode": "^2.1.0"
}
},
"node_modules/varint": {
"version": "6.0.0",
"resolved": "https://registry.npmjs.org/varint/-/varint-6.0.0.tgz",
"integrity": "sha512-cXEIW6cfr15lFv563k4GuVuW/fiwjknytD37jIOLSdSWuOI6WnO/oKwmP2FQTU2l01LP8/M5TSAJpzUaGe3uWg==",
"license": "MIT"
},
"node_modules/vite": {
"version": "6.3.5",
"resolved": "https://registry.npmjs.org/vite/-/vite-6.3.5.tgz",
+1 -4
View File
@@ -4,7 +4,6 @@
"version": "0.0.0",
"type": "module",
"scripts": {
"server": "json-server --watch db.json --port 8000",
"dev": "vite",
"build": "vite build",
"lint": "eslint .",
@@ -12,9 +11,7 @@
},
"dependencies": {
"react": "^19.1.0",
"react-dom": "^19.1.0",
"react-icons": "^5.5.0",
"sass-embedded": "^1.89.2"
"react-dom": "^19.1.0"
},
"devDependencies": {
"@eslint/js": "^9.25.0",
+46 -187
View File
@@ -1,200 +1,59 @@
import styles from './App.module.scss'
import SneakersImage from './assets/images/sneakers-image.jpg'
import { FaRegUser } from 'react-icons/fa'
import React from 'react'
import { memo, useState, useMemo } from 'react'
function EffectComponent() {
const [size, setSize] = React.useState(100);
const boxRef = React.useRef(null);
React.useEffect(() => {
const box = boxRef.current
if (box) {
const { width, height } = box.getBoundingClientRect()
console.log('[useEffect] Размеры (EffectComponent):', { width, height })
function memoize(fn) {
const cache = new Map();
return function(...args) {
const key = JSON.stringify(args);
if (cache.has(key)) {
return cache.get(key);
}
}, [size]);
const result = fn.apply(this, args);
cache.set(key,result);
return result;
}
}
function fibonachi(n, memo={}) {
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 }) => {
console.log('Rendring');
return <div>{value}</div>
}
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>,[]);
return (
<div style={{ marginBottom: '30px' }}>
<h3>useEffect</h3>
<div
ref={boxRef}
style={{
width: size,
height: size,
backgroundColor: 'lightblue',
transition: 'all 1.3s',
}}
/>
<button onClick={() => setSize(prev => prev + 20)}>Увеличить</button>
</div>
<>
<Child>
{stableChild}
</Child>
<input type="text" onChange={(e) => setText(e.target.value)} value={text} />
<button onClick={() => setCount(count + 1)}>Increment {count}</button>
</>
)
}
function LayoutEffectComponent() {
const [size, setSize] = React.useState(100)
const boxRef = React.useRef(null)
React.useLayoutEffect(() => {
const box = boxRef.current
if (box) {
const { width, height } = box.getBoundingClientRect()
console.log('[useLayoutEffect] Размеры (LayoutEffectComponent):', {
width,
height,
})
}
}, [size])
return (
<div>
<h3>useLayoutEffect</h3>
<div
ref={boxRef}
style={{
width: size,
height: size,
backgroundColor: 'lightgreen',
transition: 'all 1.3s',
}}
/>
<button onClick={() => setSize(prev => prev + 20)}>Увеличить</button>
</div>
)
}
function Header() {
const handleChange = event => {
const newValue = event.target.value
console.log('Новое значение:', newValue)
}
return (
<header className={styles.header}>
<div>
<h2>Store</h2>
<input type='text' placeholder='Search...' onChange={handleChange} />
</div>
<div>
<FaRegUser size={24} color='#3258e3' />
<button>Profile</button>
</div>
</header>
)
}
function ToolTip() {
const ref = React.useRef(null);
const [height,setHeight] = React.useState(0);
React.useLayoutEffect(()=>{
if (ref.current) {
const rect = ref.current.getBoundingClientRect();
setHeight(rect.height);
}
},[])
return <div ref={ref} style={{height: '40px'}}>Высота: {height}</div>
}
function Product({ name, brand, price, url }) {
const [isLiked, setIsLiked] = React.useState(false)
const toggleLike = () => {
setIsLiked(!isLiked)
}
function handleAddClick() {
console.log('Working!')
}
return (
<div className={styles.product}>
<img src={SneakersImage} alt='' />
<ToolTip />
<div className={styles.content}>
<div className={styles.title}>
<h4>{name}</h4>
<div className={styles.actions}>
<button
className={styles.likeButton}
onClick={toggleLike}
aria-label={isLiked ? 'Убрать лайк' : 'Добавить лайк'}
>
<svg
width='18'
height='18'
viewBox='0 0 24 24'
fill={isLiked ? 'red' : 'none'}
stroke={isLiked ? 'red' : 'currentColor'}
strokeWidth='1.5'
>
<path d='M12 21.35L10.55 20.03C5.4 15.36 2 12.28 2 8.5C2 5.42 4.42 3 7.5 3C9.24 3 10.91 3.81 12 5.09C13.09 3.81 14.76 3 16.5 3C19.58 3 22 5.42 22 8.5C22 12.28 18.6 15.36 13.45 20.04L12 21.35Z' />
</svg>
</button>
<button onClick={handleAddClick}>+</button>
</div>
</div>
<p className={styles.description}>{brand}</p>
<p className={styles.price}>${price}</p>
</div>
</div>
)
}
function MyComponent({ children }) {
return <div className="wrapper">{children}</div>;
}
function RowList({ children }) {
return (
<div className="rowList">
{children.map(child => (
<div className="row">{child}</div>
))}
<p>{React.Children.count(children)}</p>
</div>
);
}
function App() {
const [products,setProducts] = React.useState([]);
const getProducts = async () => {
const responce = await fetch('http://localhost:8000/products');
const data = await responce.json();
setProducts(data);
}
React.useEffect(() => {
getProducts();
},[]);
console.log({...products});
return (
<>
<div className={styles.container}>
<Header />
</div>
<div className={styles.container}>
<ul className={styles.list}>
{products.map(product => (
<li>
<Product {...product} />
</li>
))}
</ul>
<MyComponent>
<h4>Заголовок</h4>
<p>Привет!</p>
</MyComponent>
<ol>
<RowList>
<li>первый</li>
<li>второй</li>
<li>третий</li>
</RowList>
</ol>
</div>
<h1>Hello, React!</h1>
<Parent />
</>
)
}
-135
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@@ -1,135 +0,0 @@
@use './assets/styles/variables' as *;
.header {
display: flex;
justify-content: space-between;
align-items: center;
padding: 20px;
background-color: white;
border-bottom-left-radius: 10px;
border-bottom-right-radius: 10px;
div {
&:first-child {
display: flex;
align-items: center;
gap: 20px;
h2 {
color: $primary-color;
}
input {
border-radius: 5px;
outline: none;
font-size: 16px;
border: 1px solid gainsboro;
padding: 5px 10px;
&:focus {
border: 1px solid $primary-color;
}
}
}
&:last-child {
display: flex;
align-items: center;
gap: 10px;
button {
outline: 0;
border: 0;
border-radius: 5px;
padding: 5px 15px;
font-size: 16px;
background-color: $primary-color;
color: $white-color;
font-weight: 600;
cursor: pointer;
&:hover {
background-color: $seconday-color;
}
}
}
}
}
.container {
max-width: 1220px;
margin: 0 auto;
}
.list {
display: flex;
justify-content: space-between;
flex-wrap: wrap;
border-radius: 10px;
margin-top: 100px; /* временно */
padding: 20px;
background-color: white;
list-style: none;
}
.product {
display: flex;
flex-direction: column;
width: 350px;
gap: 20px;
border-radius: 10px;
}
.content {
display: flex;
flex-direction: column;
gap: 10px;
}
.title {
display: flex;
justify-content: space-between;
align-items: center;
h4 {
font-size: 18px;
}
.actions {
display: flex;
align-items: center;
gap: 5px;
button {
border: 1px solid $primary-color;
background-color: $white-color;
color: $primary-color;
border-radius: 5px;
outline: 0;
font-size: 20px;
padding: 5px 10px;
cursor: pointer;
&:hover {
background-color: $seconday-color;
color: $white-color;
}
}
}
}
img {
border-radius: 10px;
}
.description {
color: gray;
}
.price {
font-weight: bold;
}
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-5
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@@ -1,5 +0,0 @@
$white-color: white;
$black-color: black;
$primary-color: #3258e3;
$seconday-color: #4432e3;
+1 -2
View File
@@ -1,9 +1,8 @@
import { StrictMode } from 'react'
import { createRoot } from 'react-dom/client'
// удаляем import './index.css'
import App from './App.jsx'
createRoot(document.getElementById('root')).render(
<StrictMode>
<App />
</StrictMode>
)