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import React, { useState, experimental_Scope } from 'react';
function MyComponent() {
const [showScope, setShowScope] = useState(true);
return (
{showScope && (
{/* äžç·ã«ã¬ããŒãžã³ã¬ã¯ã·ã§ã³ãããã¹ãã³ã³ããŒãã³ã */}
)}
);
}
function ExpensiveComponent() {
// ãã®ã³ã³ããŒãã³ãã¯å€ãã®ã¡ã¢ãªãå²ãåœãŠãããè² è·ã®é«ãèšç®ãè¡ãå¯èœæ§ããããŸã
const largeArray = new Array(1000000).fill(0);
return (
{/* largeArrayã䜿çšããŠäœããã¬ã³ããªã³ã° */}
{largeArray.length}
);
}
export default MyComponent;
ãã®äŸã§ã¯ãExpensiveComponentã倧ããªé
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1. åçãªã³ã³ãã³ãã®èªã¿èŸŒã¿
èšäºãç»åãåç»ãªã©ã®å€§éã®ã³ã³ãã³ããåçã«èªã¿èŸŒãã§è¡šç€ºãããŠã§ãã¢ããªã±ãŒã·ã§ã³ãèããŠã¿ãŸãããããŠãŒã¶ãŒãç¹å®ã®ã³ã³ãã³ãããé¢ãããšãé¢é£ããã³ã³ããŒãã³ããã¢ã³ããŠã³ããããŸããexperimental_Scopeã䜿çšãããšããããã®ã³ã³ããŒãã³ãã䜿çšããã¡ã¢ãªãè¿
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2. è€éãªãã©ãŒã ã³ã³ããŒãã³ã
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3. ã€ã³ã¿ã©ã¯ãã£ããªããŒã¿å¯èŠå
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4. Reactã«ããã²ãŒã éçº
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