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Reactéçºã®äžçã§ã¯ãããã©ãŒãã³ã¹ã®æé©åã¯çµ¶ãéãªã远æ±ã§ããã¢ããªã±ãŒã·ã§ã³ã®é床ãåäžãããããã®åŒ·åãªãã¯ããã¯ã®äžã€ããç¹ã«ã¡ã¢åãå°çšã®ãã£ãã·ã¥é¢æ°ãéãããã£ãã·ã¥ã®æŽ»çšã§ããããããåã«ãã£ãã·ã¥ãå®è£ ããã ãã§ã¯æé©ãªããã©ãŒãã³ã¹ã¯ä¿èšŒãããŸãããã¢ã¯ã»ã¹é床ãšãããçãåæããŠããã£ãã·ã¥ã®æå¹æ§ãç£èŠããããšãäžå¯æ¬ ã§ãããã®èšäºã§ã¯ãReactã¢ããªã±ãŒã·ã§ã³ã«ããããã£ãã·ã¥é¢æ°ã®ããã©ãŒãã³ã¹ãå®è£ ããã³ç£èŠããããã®æŠç¥ãæ¢ããæé©åãçã«å¹æçã§ããããšã確å®ã«ããŸãã
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¥åãå床çŸãããšãã«ãããçŽæ¥ååŸããããšã§ãåé·ãªèšç®ãåæžããããšã«ãããŸããReactã§ã¯ãããã¯äžè¬çã«React.memoãuseMemoãã«ã¹ã¿ã ãã£ãã·ã¥é¢æ°ãªã©ã®ãã¯ããã¯ãçšããŠå®çŸãããŸãããããã®ããŒã«ã¯ããã©ãŒãã³ã¹ã倧å¹
ã«åäžãããããšãã§ããŸããã广çã«å®è£
ã»ç£èŠãããªãå Žåãè€éããæãå¯èœæ§ããããŸããé©åãªç£èŠããªããã°ã以äžã®ãããªç¹ã«æ°ã¥ããªããããããŸããã
- äœããããçïŒãã£ãã·ã¥ã广çã«å©çšãããŠããããäžèŠãªèšç®ãçºçããŠããã
- ãã£ãã·ã¥ç¡å¹åã®åé¡ïŒãã£ãã·ã¥ã®ç¡å¹åãäžæ£ç¢ºã ãšãå€ãããŒã¿ãäºæããªãåäœã«ã€ãªããå¯èœæ§ãããã
- ããã©ãŒãã³ã¹ã®ããã«ããã¯ïŒãã£ãã·ã¥èªäœã®ã¢ã¯ã»ã¹æéãé·ãå Žåããããããã«ããã¯ã«ãªãå¯èœæ§ãããã
ãããã£ãŠããã£ãã·ã¥ã®ã¢ã¯ã»ã¹é床ãšãããçãç£èŠããããšã¯ããã£ãã·ã³ã°æŠç¥ãæå³ããããã©ãŒãã³ã¹äžã®å©ç¹ããããããŠããããšã確èªããããã«äžå¯æ¬ ã§ããæ ªåŒåžå Žãç£èŠãããããªãã®ã ãšèããŠãã ãããç²ç®çã«æè³ããªãããã«ãç²ç®çã«ãã£ãã·ã¥ã䜿çšãã¹ãã§ã¯ãããŸãããæ å ±ã«åºã¥ããæææ±ºå®ãè¡ãããã«ã¯ããŒã¿ãå¿ èŠã§ãã
Reactã§ã®ãã£ãã·ã¥é¢æ°ã®å®è£
ã¢ãã¿ãªã³ã°ã«å ¥ãåã«ãReactã§ãã£ãã·ã¥é¢æ°ãå®è£ ããæ¹æ³ãç°¡åã«èŠãŠãããŸããããããã€ãã®æ¹æ³ããããããããã«ãã¬ãŒããªãããããŸãã
1. ã³ã³ããŒãã³ãã®ã¡ã¢åã®ããã®React.memo
React.memoã¯ã颿°ã³ã³ããŒãã³ããã¡ã¢åããé«éã³ã³ããŒãã³ãã§ããpropsã倿ŽãããŠããªãå ŽåïŒæµ
ãæ¯èŒïŒãåã¬ã³ããªã³ã°ãé²ããŸããããã¯ãè€éãªããŸãã¯é«ã³ã¹ããªpropsãåãåãã³ã³ããŒãã³ãã«æé©ã§ãããŒã¿ãåããŸãŸã§ããå Žåã®äžèŠãªåã¬ã³ããªã³ã°ãé²ããŸãã
const MyComponent = React.memo(function MyComponent(props) {
// Component logic
return <div>{props.data}</div>;
});
2. å€ãã¡ã¢åããããã®useMemo
useMemoã¯ã颿°ã®çµæãã¡ã¢åããReactããã¯ã§ããäŸåé¢ä¿ã倿Žãããå Žåã«ã®ã¿å€ãåèšç®ããŸããããã¯ãã³ã³ããŒãã³ãå
ã®é«ã³ã¹ããªèšç®ãããŒã¿å€æã«åœ¹ç«ã¡ãŸãã
const memoizedValue = useMemo(() => {
// Expensive calculation
return computeExpensiveValue(a, b);
}, [a, b]);
3. ã«ã¹ã¿ã ãã£ãã·ã¥é¢æ°
ããè€éãªãã£ãã·ã³ã°ã·ããªãªã§ã¯ãã«ã¹ã¿ã ãã£ãã·ã¥é¢æ°ãäœæã§ããŸããããã«ããããã£ãã·ã¥ã®åé€ããªã·ãŒãããŒçæãããã³ã¹ãã¬ãŒãžã¡ã«ããºã ãå¶åŸ¡ã§ããŸããåºæ¬çãªå®è£ ã§ã¯ãJavaScriptãªããžã§ã¯ãããã£ãã·ã¥ãšããŠäœ¿çšããããšããããŸãã
const cache = {};
function cachedFunction(arg) {
if (cache[arg]) {
return cache[arg];
}
const result = expensiveOperation(arg);
cache[arg] = result;
return result;
}
ããé«åºŠãªå®è£
ã§ã¯ãlru-cacheãmemoize-oneã®ãããªã©ã€ãã©ãªã䜿çšããŠãæè¿æã䜿çšãããŠããªãïŒLRUïŒåé€ããªã·ãŒãªã©ã®é«åºŠãªæ©èœãå©çšããããšããããŸãã
ãã£ãã·ã¥ã¢ã¯ã»ã¹é床ãç£èŠãããã¯ããã¯
ã§ã¯ããã£ãã·ã¥é¢æ°ã®ã¢ã¯ã»ã¹é床ãç£èŠãããã¯ããã¯ãæ¢ã£ãŠã¿ãŸãããããã£ãã·ã¥ããããŒã¿ãååŸããæéãšããŒãããèšç®ããæéãæž¬å®ããããšã«çŠç¹ãåœãŠãŸãã
1. performance.now()ã«ããæåã§ã®æé枬å®
æãçŽæ¥çãªæ¹æ³ã¯ãperformance.now()ã¡ãœããã䜿çšããŠããã£ãã·ã¥ã¢ã¯ã»ã¹ã®ååŸã«çµéããæéãæž¬å®ããããšã§ããããã«ããããã现ããªå¶åŸ¡ãå¯èœã«ãªããåã
ã®ãã£ãã·ã¥ããããšãã¹ã远跡ã§ããŸãã
function cachedFunctionWithTiming(arg) {
const cacheKey = String(arg); // Ensure the key is a string
if (cache[cacheKey]) {
const startTime = performance.now();
const result = cache[cacheKey];
const endTime = performance.now();
const accessTime = endTime - startTime;
console.log(`Cache hit for ${cacheKey}: Access time = ${accessTime}ms`);
return result;
}
const startTime = performance.now();
const result = expensiveOperation(arg);
const endTime = performance.now();
const computeTime = endTime - startTime;
cache[cacheKey] = result;
console.log(`Cache miss for ${cacheKey}: Compute time = ${computeTime}ms`);
return result;
}
ãã®ã¢ãããŒãã«ãããåãã£ãã·ã¥ãããã®ã¢ã¯ã»ã¹æéãšåãã£ãã·ã¥ãã¹ã®èšç®æéããã°ã«èšé²ã§ããŸãããããã®ãã°ãåæããããšã§ãæœåšçãªããã©ãŒãã³ã¹ã®ããã«ããã¯ãç¹å®ã§ããŸãã
2. ã¢ãã¿ãªã³ã°çšHOCïŒé«éã³ã³ããŒãã³ãïŒã§ãã£ãã·ã¥é¢æ°ãã©ãããã
React.memoã§ã©ãããããReactã³ã³ããŒãã³ãã®å Žåãã¬ã³ããªã³ã°æéãæž¬å®ããé«éã³ã³ããŒãã³ãïŒHOCïŒãäœæã§ããŸãããã®HOCã¯ã³ã³ããŒãã³ããã©ããããåã¬ã³ããªã³ã°ã«ãããæéãèšé²ããŸããããã¯ãè€éãªã³ã³ããŒãã³ãã§ã®ã¡ã¢åã®åœ±é¿ãç£èŠããã®ã«ç¹ã«åœ¹ç«ã¡ãŸãã
function withPerformanceMonitoring(WrappedComponent) {
return React.memo(function WithPerformanceMonitoring(props) {
const startTime = performance.now();
const element = <WrappedComponent {...props} />;
const endTime = performance.now();
const renderTime = endTime - startTime;
console.log(`${WrappedComponent.displayName || 'Component'} render time: ${renderTime}ms`);
return element;
});
}
const MyComponentWithMonitoring = withPerformanceMonitoring(MyComponent);
ãã®HOCã¯ãã©ã®ã³ã³ããŒãã³ãã«ãç°¡åã«é©çšããŠããã®ã¬ã³ããªã³ã°ããã©ãŒãã³ã¹ã远跡ã§ããŸãããã°ãçè§£ãããããªãããã«ãã³ã³ããŒãã³ãã«é©åã«ååãä»ããããšãå¿ããªãã§ãã ãããäžèŠãªãªãŒããŒããããé¿ããããã«ãæ¬çªç°å¢ã§ã¢ãã¿ãªã³ã°ãç¡å¹ã«ããã¡ã«ããºã ã远å ããããšãæ€èšããŠãã ããã
3. ãã©ãŠã¶éçºè ããŒã«ã䜿çšãããããã¡ã€ãªã³ã°
ææ°ã®ãã©ãŠã¶éçºè ããŒã«ã¯ãReactã¢ããªã±ãŒã·ã§ã³ã®ããã©ãŒãã³ã¹ããã«ããã¯ãç¹å®ããã®ã«åœ¹ç«ã€åŒ·åãªãããã¡ã€ãªã³ã°æ©èœãæäŸããŸããäŸãã°ãChrome DevToolsã®Performanceã¿ãã§ã¯ã颿°åŒã³åºããã¬ã³ããªã³ã°æéãã¬ããŒãžã³ã¬ã¯ã·ã§ã³ã€ãã³ããªã©ãã¢ããªã±ãŒã·ã§ã³ã®ã¢ã¯ãã£ããã£ã®ã¿ã€ã ã©ã€ã³ãèšé²ã§ããŸãããã®åŸããã®ã¿ã€ã ã©ã€ã³ãåæããŠãé ããã£ãã·ã¥ã¢ã¯ã»ã¹ãéå¹çãªèšç®ãç¹å®ã§ããŸãã
Performanceã¿ãã䜿çšããã«ã¯ããã©ãŠã¶ã®éçºè ããŒã«ãéããPerformanceã¿ãã«ç§»åããŠãRecordãã¿ã³ãã¯ãªãã¯ããã ãã§ããã¢ããªã±ãŒã·ã§ã³ãæäœããŠãç£èŠããããã£ãã·ã¥ã¢ã¯ã»ã¹ãããªã¬ãŒããŸããçµäºããããStopãã¿ã³ãã¯ãªãã¯ããŸãããããšãPerformanceã¿ãã«ã¢ããªã±ãŒã·ã§ã³ã®ã¢ã¯ãã£ããã£ã®è©³çްãªã¿ã€ã ã©ã€ã³ã衚瀺ãããŸãããã£ãã·ã¥é¢æ°ãé«ã³ã¹ããªæäœã«é¢é£ããé·ã颿°åŒã³åºããæ¢ããŠãã ããã
4. åæãã©ãããã©ãŒã ãšã®é£æº
ããé«åºŠãªã¢ãã¿ãªã³ã°ã®ããã«ããã£ãã·ã¥é¢æ°ãGoogle AnalyticsãNew RelicãDatadogãªã©ã®åæãã©ãããã©ãŒã ãšçµ±åããããšãã§ããŸãããããã®ãã©ãããã©ãŒã ã䜿çšãããšãããã©ãŒãã³ã¹ããŒã¿ããªã¢ã«ã¿ã€ã ã§åéã»åæããã¢ããªã±ãŒã·ã§ã³ã®åäœã«é¢ãã貎éãªæŽå¯ãåŸãããšãã§ããŸãã
åæãã©ãããã©ãŒã ãšçµ±åããã«ã¯ããã£ãã·ã¥ãããããã¹ãããã³ã¢ã¯ã»ã¹æéã远跡ããããã®ã³ãŒãããã£ãã·ã¥é¢æ°ã«è¿œå ããå¿ èŠããããŸãããã®ããŒã¿ã¯ããã®ãã©ãããã©ãŒã ã®APIã䜿çšããŠéä¿¡ã§ããŸãã
function cachedFunctionWithAnalytics(arg) {
const cacheKey = String(arg);
if (cache[cacheKey]) {
const startTime = performance.now();
const result = cache[cacheKey];
const endTime = performance.now();
const accessTime = endTime - startTime;
// Send cache hit data to analytics platform
trackEvent('cache_hit', { key: cacheKey, accessTime: accessTime });
return result;
}
const startTime = performance.now();
const result = expensiveOperation(arg);
const endTime = performance.now();
const computeTime = endTime - startTime;
cache[cacheKey] = result;
// Send cache miss data to analytics platform
trackEvent('cache_miss', { key: cacheKey, computeTime: computeTime });
return result;
}
//Example trackEvent function (replace with your analytics platform's API)
function trackEvent(eventName, eventData) {
console.log(`Analytics event: ${eventName}`, eventData);
// Replace with your actual analytics platform's code (e.g., ga('send', 'event', ...))
}
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