{"id":28476,"date":"2025-08-30T17:30:23","date_gmt":"2025-08-30T14:30:23","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/react-performans-optimizasyonu-usememo-usecallback-ve-react-memo\/"},"modified":"2025-08-30T17:30:23","modified_gmt":"2025-08-30T14:30:23","slug":"react-performans-optimizasyonu-usememo-usecallback-ve-react-memo","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/react-performans-optimizasyonu-usememo-usecallback-ve-react-memo\/","title":{"rendered":"React Performans Optimizasyonu: useMemo, useCallback ve React.memo"},"content":{"rendered":"<p>React Performans Optimizasyonu: useMemo, useCallback ve React.memo<\/p>\n<p>React uygulamalar\u0131n\u0131z yava\u015fl\u0131yor mu?  Karma\u015f\u0131k bile\u015fenleriniz render performans\u0131n\u0131 d\u00fc\u015f\u00fcr\u00fcyor mu?  Bu makalede, React&#8217;in performans optimizasyon ara\u00e7lar\u0131 olan <code>useMemo<\/code>, <code>useCallback<\/code> ve <code>React.memo<\/code>&#8216;yu derinlemesine inceleyece\u011fiz.  Bu ara\u00e7lar\u0131 ne zaman, nas\u0131l ve neden kullanman\u0131z gerekti\u011fini, ger\u00e7ek d\u00fcnya senaryolar\u0131yla birlikte ad\u0131m ad\u0131m \u00f6\u011freneceksiniz.  Performans\u0131n\u0131z\u0131 art\u0131rmak ve React uygulamalar\u0131n\u0131z\u0131n daha h\u0131zl\u0131 ve verimli \u00e7al\u0131\u015fmas\u0131n\u0131 sa\u011flamak i\u00e7in bu rehberi dikkatlice inceleyin.<\/p>\n<h2>React Performans Optimizasyonu \u0130\u00e7in Temel Kavramlar<\/h2>\n<p>React&#8217;in sanal DOM (Document Object Model) mimarisi, ger\u00e7ek DOM&#8217;a g\u00f6re daha h\u0131zl\u0131 g\u00fcncellemeler sa\u011flar. Ancak, karma\u015f\u0131k uygulamalarda bile\u015fenlerin gereksiz yere yeniden renderlanmas\u0131 performans sorunlar\u0131na yol a\u00e7abilir.  Bu gereksiz yeniden render olaylar\u0131n\u0131 \u00f6nlemek i\u00e7in React, \u00e7e\u015fitli optimizasyon teknikleri sunar.  <code>useMemo<\/code>, <code>useCallback<\/code> ve <code>React.memo<\/code>, bu tekniklerin en yayg\u0131n ve etkili olanlar\u0131d\u0131r.  \u00d6ncelikle, bu kavramlar\u0131 ayr\u0131 ayr\u0131 ele alal\u0131m.<\/p>\n<p><strong>useMemo:<\/strong>  <code>useMemo<\/code> hook&#8217;u, pahal\u0131 hesaplamalar\u0131 haf\u0131zada tutarak tekrar tekrar hesaplaman\u0131n \u00f6n\u00fcne ge\u00e7er.  Bir fonksiyon ve ba\u011f\u0131ml\u0131l\u0131k dizisi al\u0131r. Ba\u011f\u0131ml\u0131l\u0131klardan herhangi biri de\u011fi\u015fti\u011finde fonksiyon yeniden \u00e7al\u0131\u015ft\u0131r\u0131l\u0131r ve sonucu haf\u0131zada saklan\u0131r. Aksi takdirde, \u00f6nbelle\u011fe al\u0131nm\u0131\u015f sonu\u00e7 geri d\u00f6nd\u00fcr\u00fcl\u00fcr.  Bu sayede, her renderda ayn\u0131 hesaplaman\u0131n tekrar tekrar yap\u0131lmas\u0131n\u0131n \u00f6n\u00fcne ge\u00e7erek performans art\u0131\u015f\u0131 sa\u011flan\u0131r.<\/p>\n<p><strong>useCallback:<\/strong> <code>useCallback<\/code> hook&#8217;u, fonksiyonlar\u0131 haf\u0131zada tutarak referanslar\u0131n\u0131 korur.  Bu, fonksiyonlar\u0131n her renderda yeniden olu\u015fturulmas\u0131n\u0131 \u00f6nler.  Bu durum, \u00f6zellikle bir \u00fcst bile\u015fene fonksiyon prop&#8217;u olarak ge\u00e7en fonksiyonlarda \u00f6nemlidir.  \u00c7\u00fcnk\u00fc \u00fcst bile\u015fen, fonksiyonun referans\u0131 de\u011fi\u015fmedi\u011fi s\u00fcrece yeniden renderlanmaz.  Sonu\u00e7 olarak, gereksiz yeniden render olaylar\u0131n\u0131 azalt\u0131r.<\/p>\n<p><strong>React.memo:<\/strong> <code>React.memo<\/code> y\u00fcksek mertebeli bir bile\u015fendir.  Bir bile\u015feni al\u0131r ve \u00f6nbelle\u011fe al\u0131r.  Props&#8217;lar de\u011fi\u015fmedi\u011fi s\u00fcrece, bile\u015fen yeniden renderlanmaz.  Bu, performans a\u00e7\u0131s\u0131ndan \u00f6zellikle prop&#8217;lar s\u0131k de\u011fi\u015fmeyen ve pahal\u0131 render i\u015flemlerine sahip bile\u015fenlerde olduk\u00e7a etkilidir.  Varsay\u0131lan olarak, referans kar\u015f\u0131la\u015ft\u0131rma yapar.  Ancak, <code>areEqual<\/code> fonksiyonu ile \u00f6zelle\u015ftirilebilir.<\/p>\n<h2>useMemo Nas\u0131l Kullan\u0131l\u0131r? \u00d6rneklerle Anlat\u0131m<\/h2>\n<p>useMemo&#8217;nun g\u00fcc\u00fcn\u00fc anlamak i\u00e7in, karma\u015f\u0131k bir hesaplama gerektiren bir senaryo ele alal\u0131m.  \u00d6rne\u011fin, b\u00fcy\u00fck bir dizi \u00fczerinde i\u015flem yaparak bir toplam hesaplamam\u0131z gerekti\u011fini varsayal\u0131m.  Bu i\u015flem her renderda tekrarlan\u0131rsa, performans d\u00fc\u015f\u00fckl\u00fc\u011f\u00fcne yol a\u00e7abilir.<\/p>\n<p>\u0130\u015fte <code>useMemo<\/code> kullanmadan \u00f6nceki durum:<\/p>\n<pre><code class=\"language-javascript\">function MyComponent() {\n  const numbers = [1, 2, 3, ..., 100000]; \/\/ B\u00fcy\u00fck bir dizi\n  const sum = numbers.reduce((acc, curr) => acc + curr, 0); \n  return <div>Toplam: {sum}<\/div>;\n}<\/pre>\n<p><\/code><\/p>\n<p>Her renderda <code>reduce<\/code> fonksiyonu \u00e7al\u0131\u015ft\u0131r\u0131l\u0131yor.  \u015eimdi <code>useMemo<\/code> ile optimize edelim:<\/p>\n<pre><code class=\"language-javascript\">import React, { useMemo } from &#039;react&#039;;\n\nfunction MyComponent() {\n  const numbers = [1, 2, 3, ..., 100000];\n  const sum = useMemo(() => numbers.reduce((acc, curr) => acc + curr, 0), [numbers]); \n  return <div>Toplam: {sum}<\/div>;\n}<\/pre>\n<p><\/code><\/p>\n<p>Art\u0131k <code>sum<\/code> de\u011fi\u015fkeni sadece <code>numbers<\/code> dizisi de\u011fi\u015fti\u011finde hesaplanacak.  <code>[numbers]<\/code> ba\u011f\u0131ml\u0131l\u0131k dizisi, <code>useMemo<\/code>'nun ne zaman yeniden hesaplama yapmas\u0131 gerekti\u011fini belirler.  Bu basit de\u011fi\u015fiklik, b\u00fcy\u00fck diziler i\u00e7in \u00f6nemli performans iyile\u015ftirmeleri sa\u011flar.  Ba\u015fka bir \u00f6rnek olarak, karma\u015f\u0131k bir g\u00f6rsel i\u015flemin sonucunu <code>useMemo<\/code> ile \u00f6nbelle\u011fe alabiliriz.<\/p>\n<h2>useCallback Nas\u0131l Kullan\u0131l\u0131r? Ger\u00e7ek D\u00fcnya Senaryolar\u0131<\/h2>\n<p>Bir \u00fcst bile\u015fene fonksiyon prop'u olarak ge\u00e7en fonksiyonlar\u0131 optimize etmek i\u00e7in <code>useCallback<\/code> kullan\u0131r\u0131z.  \u00d6rne\u011fin, bir form bile\u015feninde, form verilerini g\u00f6nderen bir fonksiyonu \u00fcst bile\u015fene ge\u00e7irelim.  Bu fonksiyon her renderda yeniden olu\u015fturulursa, gereksiz yeniden renderlara yol a\u00e7abilir.<\/p>\n<p>\u0130\u015fte <code>useCallback<\/code> kullanmadan \u00f6nceki durum:<\/p>\n<pre><code class=\"language-javascript\">function ParentComponent() {\n  const handleSubmit = (data) => {\n    console.log(&#039;Veriler g\u00f6nderildi:&#039;, data);\n  };\n\n  return <ChildComponent onSubmit={handleSubmit} \/>;\n}\n\nfunction ChildComponent({ onSubmit }) {\n  \/\/ ... Form bile\u015feni ...\n  return <button onClick={() => onSubmit({ name: &#039;Fatih&#039;, email: &#039;fatih@example.com&#039; })}>G\u00f6nder<\/button>;\n}<\/pre>\n<p><\/code><\/p>\n<p>\u015eimdi <code>useCallback<\/code> ile optimize edelim:<\/p>\n<pre><code class=\"language-javascript\">import React, { useCallback } from &#039;react&#039;;\n\nfunction ParentComponent() {\n  const handleSubmit = useCallback((data) => {\n    console.log(&#039;Veriler g\u00f6nderildi:&#039;, data);\n  }, []); \/\/ Bo\u015f dizi, fonksiyonun asla yeniden olu\u015fturulmayaca\u011f\u0131n\u0131 belirtir\n\n  return <ChildComponent onSubmit={handleSubmit} \/>;\n}\n\nfunction ChildComponent({ onSubmit }) {\n  \/\/ ... Form bile\u015feni ...\n  return <button onClick={() => onSubmit({ name: &#039;Fatih&#039;, email: &#039;fatih@example.com&#039; })}>G\u00f6nder<\/button>;\n}<\/pre>\n<p><\/code><\/p>\n<p>Bo\u015f ba\u011f\u0131ml\u0131l\u0131k dizisi sayesinde, <code>handleSubmit<\/code> fonksiyonu sadece ilk renderda olu\u015fturulur ve daha sonra referans\u0131 korunur.  Bu da <code>ChildComponent<\/code>'\u0131n gereksiz yeniden renderlanmas\u0131n\u0131 \u00f6nler.  Bu, \u00f6zellikle b\u00fcy\u00fck formlar veya karma\u015f\u0131k i\u015flemler i\u00e7eren bile\u015fenlerde \u00f6nemlidir.<\/p>\n<h2>React.memo Nas\u0131l Kullan\u0131l\u0131r? Performans Kar\u015f\u0131la\u015ft\u0131rmalar\u0131<\/h2>\n<p>React.memo, bile\u015fenlerin gereksiz yeniden renderlanmas\u0131n\u0131 \u00f6nlemek i\u00e7in kullan\u0131\u015fl\u0131d\u0131r.  \u00d6zellikle prop'lar\u0131 s\u0131k de\u011fi\u015fmeyen ve render i\u015flemleri pahal\u0131 olan bile\u015fenler i\u00e7in idealdir.  Bir liste bile\u015fenini ele alal\u0131m.  Liste \u00f6\u011felerinin i\u00e7eri\u011fi de\u011fi\u015fmedik\u00e7e, bile\u015fenin yeniden renderlanmas\u0131na gerek yoktur.<\/p>\n<pre><code class=\"language-javascript\">const MyList = React.memo(({ items }) => (\n  <ul>\n    {items.map((item) => (\n      <li key={item.id}>{item.name}<\/li>\n    ))}\n  <\/ul>\n));<\/pre>\n<p><\/code><\/p>\n<p>React.memo, varsay\u0131lan olarak referans e\u015fitli\u011fini kontrol eder.  Ancak, <code>areEqual<\/code> prop'u kullan\u0131larak \u00f6zelle\u015ftirilebilir.  Bu, karma\u015f\u0131k nesnelerin kar\u015f\u0131la\u015ft\u0131r\u0131lmas\u0131nda daha hassas kontrol sa\u011flar.<\/p>\n<p>Performans kar\u015f\u0131la\u015ft\u0131rmas\u0131 i\u00e7in, <code>React.memo<\/code> kullanmadan ve kulland\u0131ktan sonra render say\u0131lar\u0131n\u0131 kar\u015f\u0131la\u015ft\u0131ral\u0131m.  Bu, React Developer Tools veya benzeri ara\u00e7larla yap\u0131labilir.  Genellikle, <code>React.memo<\/code> ile \u00f6nemli \u00f6l\u00e7\u00fcde render say\u0131s\u0131 azal\u0131r, bu da performans iyile\u015fmesine yol a\u00e7ar.<\/p>\n<h2>\u0130leri D\u00fczey Optimizasyon Teknikleri:  \u015eartl\u0131 Renderlama<\/h2>\n<p>useMemo, useCallback ve React.memo'nun \u00f6tesinde, performans\u0131 daha da iyile\u015ftirmek i\u00e7in di\u011fer teknikleri kullanabiliriz.  \u015eartl\u0131 renderlama, bile\u015fenlerin yaln\u0131zca gerekti\u011finde yeniden renderlanmas\u0131n\u0131 sa\u011flar.  <code>shouldComponentUpdate<\/code> lifecycle metodu veya React'in yeni hook'lar\u0131 ile bu ger\u00e7ekle\u015ftirilebilir.  <code>useMemo<\/code> ile bir ko\u015ful ekleyerek de \u015fartl\u0131 renderlama yapabiliriz.<\/p>\n<pre><code class=\"language-javascript\">import React, { useMemo, useState } from &#039;react&#039;;\n\nfunction MyComponent({ data }) {\n  const [count, setCount] = useState(0);\n\n  const expensiveCalculation = useMemo(() => {\n    if (data.length > 1000) {\n       return complexCalculation(data);\n    }\n    return null;\n  }, [data]);\n\n  return (\n    <div>\n      <p>Count: {count}<\/p>\n      <button onClick={() => setCount(count + 1)}>Art\u0131r<\/button>\n      {expensiveCalculation && <p>Sonu\u00e7: {expensiveCalculation}<\/p>}\n    <\/div>\n  );\n}<\/pre>\n<p><\/code><\/p>\n<p>Bu \u00f6rnekte, <code>expensiveCalculation<\/code> sadece <code>data<\/code> dizisinin uzunlu\u011fu 1000'den b\u00fcy\u00fckse hesaplan\u0131r.  Bu sayede, b\u00fcy\u00fck veriler i\u00e7in performans art\u0131\u015f\u0131 sa\u011flan\u0131r.  Ayr\u0131ca, memoize edilmi\u015f sonu\u00e7, sonraki renderlarda yeniden hesaplanmaz.  Bu teknik, performans sorunlar\u0131n\u0131 gidermek i\u00e7in \u00e7ok \u00f6nemli bir stratejidir.<\/p>\n<h2>\u00d6nemli Uyar\u0131lar ve G\u00fcvenlik \u00d6nlemleri<\/h2>\n<p><strong>Dikkat:<\/strong> <code>useMemo<\/code> ve <code>useCallback<\/code>'\u0131 gereksiz yere kullanmaktan ka\u00e7\u0131n\u0131n.  Bu hook'lar, performans iyile\u015ftirmesi sa\u011flasa da, gereksiz yere kullan\u0131m\u0131, kodun karma\u015f\u0131kl\u0131\u011f\u0131n\u0131 art\u0131rabilir ve okunabilirli\u011fini azaltabilir.  Sadece ger\u00e7ekten pahal\u0131 i\u015flemler i\u00e7in kullan\u0131lmalar\u0131 \u00f6nemlidir.  Ayr\u0131ca, ba\u011f\u0131ml\u0131l\u0131k dizilerinin do\u011fru bir \u015fekilde tan\u0131mlanmas\u0131, optimizasyonun do\u011fru \u00e7al\u0131\u015fmas\u0131 i\u00e7in kritik \u00f6neme sahiptir.  Yanl\u0131\u015f tan\u0131mlanm\u0131\u015f ba\u011f\u0131ml\u0131l\u0131k dizileri, beklenmedik davran\u0131\u015flara yol a\u00e7abilir.<\/p>\n<h2>Sonu\u00e7 ve S\u0131k\u00e7a Sorulan Sorular<\/h2>\n<p>Bu makalede, React performans optimizasyonu i\u00e7in kullan\u0131lan \u00fc\u00e7 \u00f6nemli hook olan <code>useMemo<\/code>, <code>useCallback<\/code> ve <code>React.memo<\/code>'yu detayl\u0131 olarak inceledik.  Bu ara\u00e7lar\u0131 do\u011fru bir \u015fekilde kullanarak, React uygulamalar\u0131n\u0131z\u0131n performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilirsiniz.  Ancak, bu ara\u00e7lar\u0131 gereksiz yere kullanmaktan ka\u00e7\u0131nmak da olduk\u00e7a \u00f6nemlidir.  Performans optimizasyonu, uygulaman\u0131z\u0131n \u00f6zel gereksinimlerine ba\u011fl\u0131 olarak de\u011fi\u015fir.  Daha fazla bilgi i\u00e7in (https:\/\/fatihsoysal.com) inceleyebilirsiniz.<\/p>\n<h3>S\u0131k\u00e7a Sorulan Sorular:<\/h3>\n<ul>\n<li><strong>useMemo ve useCallback aras\u0131ndaki fark nedir?<\/strong> <code>useMemo<\/code> de\u011ferleri, <code>useCallback<\/code> ise fonksiyonlar\u0131 \u00f6nbelle\u011fe al\u0131r.<\/li>\n<li><strong>React.memo her zaman performans\u0131 iyile\u015ftirir mi?<\/strong> Hay\u0131r, baz\u0131 durumlarda performans iyile\u015fmesi g\u00f6zlemlenmeyebilir veya hatta k\u00fc\u00e7\u00fck bir d\u00fc\u015f\u00fc\u015f ya\u015fanabilir.  Bu, bile\u015fenin karma\u015f\u0131kl\u0131\u011f\u0131na ve prop'lar\u0131n s\u0131kl\u0131\u011f\u0131na ba\u011fl\u0131d\u0131r.<\/li>\n<li><strong>Ba\u011f\u0131ml\u0131l\u0131k dizisi (dependency array) nedir?<\/strong> <code>useMemo<\/code> ve <code>useCallback<\/code>'\u0131n ne zaman yeniden \u00e7al\u0131\u015ft\u0131r\u0131laca\u011f\u0131n\u0131 belirleyen bir dizi de\u011ferdir.<\/li>\n<li><strong><code>areEqual<\/code> fonksiyonu ne i\u015fe yarar?<\/strong> <code>React.memo<\/code>'da, \u00f6zelle\u015ftirilmi\u015f bir e\u015fitlik kar\u015f\u0131la\u015ft\u0131rma fonksiyonu sa\u011flar.<\/li>\n<li><strong>\u00c7ok fazla optimizasyon zararl\u0131 olabilir mi?<\/strong> Evet, gereksiz optimizasyonlar kodun okunabilirli\u011fini ve s\u00fcrd\u00fcr\u00fclebilirli\u011fini azaltabilir.<\/li>\n<\/ul>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"React Performans Optimizasyonu: useMemo, useCallback ve React.memo React uygulamalar\u0131n\u0131z yava\u015fl\u0131yor mu? Karma\u015f\u0131k bile\u015fenleriniz render performans\u0131n\u0131 d\u00fc\u015f\u00fcr\u00fcyor mu? Bu&hellip;","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-28476","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-genel","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.5 (Yoast SEO v25.3.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>React Performans Optimizasyonu: useMemo, useCallback ve React.memo<\/title>\n<meta name=\"description\" content=\"React uygulamalar\u0131n\u0131z yava\u015fl\u0131yor mu? Karma\u015f\u0131k bile\u015fenleriniz render performans\u0131n\u0131 d\u00fc\u015f\u00fcr\u00fcyor mu? Bu makalede, React&#039;in performans optimizasyon ara\u00e7lar\u0131 olan `useMemo`, `useCallback` ve `React.memo`&#039;yu derinlemesine inceleyece\u011fiz. Bu ara\u00e7lar\u0131 ne zaman, nas\u0131l ve neden kullanman\u0131z gerekti\u011fini, ger\u00e7ek d\u00fcnya senaryolar\u0131yla birlikte ad\u0131m ad\u0131m \u00f6\u011freneceksiniz. Performans\u0131n\u0131z\u0131 art\u0131rmak ve React uygulamalar\u0131n\u0131z\u0131n daha h\u0131zl\u0131 ve verimli \u00e7al\u0131\u015fmas\u0131n\u0131 sa\u011flamak i\u00e7in bu rehberi dikkatlice inceleyin.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fatihsoysal.com\/blog\/react-performans-optimizasyonu-usememo-usecallback-ve-react-memo\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"React Performans Optimizasyonu: useMemo, useCallback ve React.memo\" \/>\n<meta property=\"og:description\" content=\"React uygulamalar\u0131n\u0131z yava\u015fl\u0131yor mu? Karma\u015f\u0131k bile\u015fenleriniz render performans\u0131n\u0131 d\u00fc\u015f\u00fcr\u00fcyor mu? Bu makalede, React&#039;in performans optimizasyon ara\u00e7lar\u0131 olan `useMemo`, `useCallback` ve `React.memo`&#039;yu derinlemesine inceleyece\u011fiz. Bu ara\u00e7lar\u0131 ne zaman, nas\u0131l ve neden kullanman\u0131z gerekti\u011fini, ger\u00e7ek d\u00fcnya senaryolar\u0131yla birlikte ad\u0131m ad\u0131m \u00f6\u011freneceksiniz. 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