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const expensiveCalculation = (a, b) => {
console.log('Performing expensive calculation...');
// æéã®ãããæäœãã·ãã¥ã¬ãŒã
let result = 0;
for (let i = 0; i < 1000000; i++) {
result += a * b;
}
return result;
};
const MyComponent = ({ a, b }) => {
const result = React.useMemo(() => expensiveCalculation(a, b), [a, b]);
return (
Result: {result}
);
};
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import React, { useState, useEffect, useCallback } from 'react';
const fetchData = async (endpoint) => {
console.log(`Fetching data from ${endpoint}...`);
const response = await fetch(endpoint);
if (!response.ok) {
throw new Error(`HTTP error! Status: ${response.status}`);
}
return response.json();
};
const Dashboard = () => {
const [userId, setUserId] = useState(1);
const [refresh, setRefresh] = useState(false);
// experimental_useMemoCacheã䜿çšããŠãã£ãã·ã¥ãäœæ
const cache = React.unstable_useMemoCache(10); // 10ãšã³ããªã«å¶é
const invalidateCache = () => {
console.log("Invalidating cache...");
setRefresh(prev => !prev); // ãªãã¬ãã·ã¥ç¶æ
ããã°ã«ããŠåã¬ã³ããªã³ã°ãããªã¬ãŒ
};
// ã¡ã¢åãããããŒã¿ååŸé¢æ°
const userData = React.useMemo(() => {
const endpoint = `https://jsonplaceholder.typicode.com/users/${userId}`;
// ãã£ãã·ã¥ããããŒã¿ãååŸããããšããŸã
const cachedData = cache.read(() => endpoint, () => {
// ãã£ãã·ã¥ã«ãªãå Žåã¯ååŸããŸã
console.log("Cache miss. Fetching data...");
return fetchData(endpoint);
});
return cachedData;
}, [userId, cache, refresh]);
const handleUserIdChange = (event) => {
setUserId(parseInt(event.target.value));
};
return (
User Dashboard
{userData ? (
User Details
Name: {userData.name}
Email: {userData.email}
) : (
Loading...
)}
);
};
export default Dashboard;
説æïŒ
React.unstable_useMemoCache(10)
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颿°ã䜿çšãããšãå¿ èŠã«å¿ããŠãã£ãã·ã¥ãæåã§ç¡å¹åã§ããŸãããã®äŸã§ã¯ããã¿ã³ã¯ãªãã¯ã«ãã£ãŠããªã¬ãŒãããŸããrefresh
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React.unstable_useMemoCache(size)
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