{"id":32841,"date":"2025-10-26T14:31:50","date_gmt":"2025-10-26T11:31:50","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/react-hooks-ile-tanisin-neden-hatalar-yapiyoruz-ve-nasil-kaciniriz\/"},"modified":"2025-10-26T14:31:50","modified_gmt":"2025-10-26T11:31:50","slug":"react-hooks-ile-tanisin-neden-hatalar-yapiyoruz-ve-nasil-kaciniriz","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/react-hooks-ile-tanisin-neden-hatalar-yapiyoruz-ve-nasil-kaciniriz\/","title":{"rendered":"React Hooks ile Tan\u0131\u015f\u0131n: Neden Hatalar Yap\u0131yoruz ve Nas\u0131l Ka\u00e7\u0131n\u0131r\u0131z?"},"content":{"rendered":"<p class=\"title\">React Hooks ile Ba\u015flang\u0131\u00e7 Hatalar\u0131: Kapsaml\u0131 Rehber<\/p>\n<p>React Hooks, fonksiyonel bile\u015fenlerde state ve ya\u015fam d\u00f6ng\u00fcs\u00fc \u00f6zelliklerini kullanmam\u0131z\u0131 sa\u011flayarak React geli\u015ftirme deneyimini k\u00f6kten de\u011fi\u015ftirdi. Ancak, bu g\u00fc\u00e7l\u00fc ara\u00e7lar ba\u015flang\u0131\u00e7 seviyesi geli\u015ftiriciler i\u00e7in baz\u0131 tuzaklar da bar\u0131nd\u0131r\u0131r. Bu kapsaml\u0131 rehberde, React Hooks kullan\u0131rken en s\u0131k yap\u0131lan 5 hatay\u0131 inceleyecek, bu hatalardan nas\u0131l ka\u00e7\u0131naca\u011f\u0131n\u0131z\u0131 ve daha sa\u011flam, performansl\u0131 uygulamalar geli\u015ftirmek i\u00e7in en iyi uygulamalar\u0131 \u00f6\u011freneceksiniz. Haz\u0131r m\u0131s\u0131n\u0131z? Gelin, Hooks d\u00fcnyas\u0131na dalal\u0131m ve yayg\u0131n engelleri birlikte a\u015fal\u0131m.<\/p>\n<style>\n  \/* Mobil uyumlu tasar\u0131m i\u00e7in genel stil \u00f6rnekleri *\/\n  .responsive-container {\n    width: 100%;\n    padding: 15px;\n    box-sizing: border-box;\n  }<\/p>\n<p>  .code-block-container {\n    background-color: #f5f5f5;\n    border-left: 5px solid #007bff;\n    padding: 10px;\n    margin-bottom: 20px;\n    overflow-x: auto; \/* Kod bloklar\u0131n\u0131n mobil ekranda ta\u015fmas\u0131n\u0131 engeller *\/\n    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, monospace;\n    font-size: 0.9em;\n    line-height: 1.4;\n  }<\/p>\n<p>  pre {\n      margin: 0;\n  }<\/p>\n<p>  .expert-tip {\n    background-color: #e0f7fa; \/* A\u00e7\u0131k mavi *\/\n    border-left: 4px solid #00bcd4; \/* Daha koyu mavi *\/\n    padding: 15px;\n    margin: 20px 0;\n    font-style: italic;\n    color: #006064; \/* Koyu deniz mavisi *\/\n  }<\/p>\n<p>  \/* Mobil cihazlar i\u00e7in medya sorgusu \u00f6rne\u011fi *\/\n  @media (max-width: 768px) {\n    .responsive-container {\n      padding: 10px;\n    }\n    h2 {\n      font-size: 1.6em;\n    }\n    h3 {\n      font-size: 1.3em;\n    }\n    .code-block-container {\n      font-size: 0.8em;\n    }\n    .expert-tip {\n      padding: 10px;\n      margin: 15px 0;\n    }\n  }<\/p>\n<p>  \/* Daha k\u00fc\u00e7\u00fck ekranlar i\u00e7in *\/\n  @media (max-width: 480px) {\n    h2 {\n      font-size: 1.4em;\n    }\n    h3 {\n      font-size: 1.1em;\n    }\n  }\n<\/style>\n<div class=\"responsive-container\">\n<p>React Hooks, 2019 y\u0131l\u0131nda React 16.8 ile birlikte tan\u0131t\u0131ld\u0131 ve o g\u00fcnden bu yana React geli\u015ftirme paradigmalar\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde etkiledi. Daha \u00f6nce sadece s\u0131n\u0131f tabanl\u0131 bile\u015fenlerde eri\u015filebilen state y\u00f6netimi ve ya\u015fam d\u00f6ng\u00fcs\u00fc metodlar\u0131 gibi \u00f6zelliklerin, fonksiyonel bile\u015fenlerde de kullan\u0131labilmesini sa\u011flad\u0131. Bu, daha temiz, daha anla\u015f\u0131l\u0131r ve daha yeniden kullan\u0131labilir kod yazman\u0131n kap\u0131lar\u0131n\u0131 aralad\u0131. \u00d6rne\u011fin, <code>useState<\/code> ile bir bile\u015fenin i\u00e7indeki durumu kolayca y\u00f6netebilirken, <code>useEffect<\/code> ile side effect&#8217;leri (veri \u00e7ekme, DOM manip\u00fclasyonu, abonelikler vb.) kontrol alt\u0131na alabiliyoruz. Ancak, bu g\u00fc\u00e7l\u00fc ara\u00e7lar beraberinde baz\u0131 \u00f6\u011frenme e\u011frileri de getiriyor.<\/p>\n<p>Peki, React Hooks neden ba\u015flang\u0131\u00e7 seviyesi geli\u015ftiriciler i\u00e7in bu kadar zorlay\u0131c\u0131 olabiliyor? Temelde, Hooks, React&#8217;in dahili \u00e7al\u0131\u015fma prensipleriyle (\u00f6rne\u011fin, render d\u00f6ng\u00fcs\u00fc, referans e\u015fitli\u011fi) derinlemesine ba\u011flant\u0131l\u0131d\u0131r. Geleneksel s\u0131n\u0131f bile\u015fenlerindeki ya\u015fam d\u00f6ng\u00fcs\u00fc metodlar\u0131na al\u0131\u015fk\u0131n olan geli\u015ftiriciler, Hooks&#8217;un daha deklaratif ve fonksiyonel yakla\u015f\u0131m\u0131na adapte olmakta zorlanabilirler. \u00d6zellikle <code>useEffect<\/code>&#8216;in ba\u011f\u0131ml\u0131l\u0131k dizisi ve kapan\u0131\u015flar (closures) kavramlar\u0131, React&#8217;in nas\u0131l yeniden render edildi\u011fini ve state&#8217;i nas\u0131l y\u00f6netti\u011fini tam olarak anlamadan yanl\u0131\u015f kullan\u0131mlara yol a\u00e7abiliyor. Bu durum, beklenmedik davran\u0131\u015flara, performans sorunlar\u0131na veya sonsuz d\u00f6ng\u00fclere neden olabilir. Ayr\u0131ca, Hooks&#8217;un belirli kurallar\u0131 vard\u0131r (\u00f6rne\u011fin, Hooks&#8217;u sadece fonksiyonel bile\u015fenlerin veya \u00f6zel Hooks&#8217;lar\u0131n en \u00fcst seviyesinde \u00e7a\u011f\u0131rmak gibi) ve bu kurallara uyulmamas\u0131 hatalara davetiye \u00e7\u0131kar\u0131r.<\/p>\n<p>Bu makalede, React Hooks ile ilgili en yayg\u0131n 5 hatay\u0131 ele alarak, bu kavramlar\u0131 daha derinlemesine anlaman\u0131za yard\u0131mc\u0131 olmay\u0131 hedefliyoruz. Her bir hata i\u00e7in ger\u00e7ek d\u00fcnya senaryolar\u0131na dayal\u0131 vaka analizleri sunacak, do\u011fru ve yanl\u0131\u015f kullan\u0131mlar\u0131 kod \u00f6rnekleriyle a\u00e7\u0131klayaca\u011f\u0131z. Amac\u0131m\u0131z, bu tuzaklardan ka\u00e7\u0131nman\u0131z\u0131 sa\u011flayacak bilgi ve pratik ipu\u00e7lar\u0131 sunarak, React Hooks&#8217;u ustaca kullanman\u0131za yard\u0131mc\u0131 olmakt\u0131r. Bu yolculuk boyunca, sadece hatalar\u0131 tan\u0131mlamakla kalmayacak, ayn\u0131 zamanda onlar\u0131n alt\u0131nda yatan temel React prensiplerini de ke\u015ffedece\u011fiz. Unutmay\u0131n, hatalar \u00f6\u011frenme s\u00fcrecinin do\u011fal bir par\u00e7as\u0131d\u0131r ve onlar\u0131 anlayarak \u00e7ok daha g\u00fc\u00e7l\u00fc bir geli\u015ftirici olabilirsiniz.<\/p>\n<h2>useState&#8217;i Yanl\u0131\u015f Kullan\u0131yor Olabilir Misiniz? State G\u00fcncellemelerinin \u0130nce Detaylar\u0131<\/h2>\n<p><code>useState<\/code>, React Hooks&#8217;un temel ta\u015flar\u0131ndan biridir ve fonksiyonel bile\u015fenlerde state y\u00f6netimi i\u00e7in kullan\u0131l\u0131r. Basit gibi g\u00f6r\u00fcnse de, \u00f6zellikle state g\u00fcncellemeleri s\u00f6z konusu oldu\u011funda baz\u0131 incelikleri vard\u0131r. Ba\u015flang\u0131\u00e7 seviyesi geli\u015ftiricilerin yapt\u0131\u011f\u0131 en yayg\u0131n hatalardan biri, state&#8217;i do\u011frudan mutate etmeye \u00e7al\u0131\u015fmak veya g\u00fcncellemelerin e\u015fzamans\u0131z (asynchronous) do\u011fas\u0131n\u0131 yanl\u0131\u015f anlamakt\u0131r.<\/p>\n<p>\u00d6ncelikle, <code>useState<\/code>&#8216;in nas\u0131l \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 hat\u0131rlayal\u0131m. Bir <code>useState<\/code> \u00e7a\u011fr\u0131s\u0131 iki elemanl\u0131 bir dizi d\u00f6nd\u00fcr\u00fcr: g\u00fcncel state de\u011feri ve bu de\u011feri g\u00fcncelleyen bir fonksiyon. \u00d6rne\u011fin, <code>const [count, setCount] = useState(0);<\/code> \u015feklinde bir kullan\u0131m, <code>count<\/code> de\u011ferini ve <code>setCount<\/code> fonksiyonunu bize verir. \u00d6nemli nokta \u015fudur ki, React&#8217;teki state de\u011ferleri immutable (de\u011fi\u015fmez) olmal\u0131d\u0131r. Yani, bir state&#8217;i g\u00fcncellemek istedi\u011finizde, mevcut state \u00fczerinde de\u011fi\u015fiklik yapmak yerine, state&#8217;in yeni bir kopyas\u0131n\u0131 olu\u015fturup bu kopyay\u0131 d\u00f6nd\u00fcrmeniz gerekir. Bu prensip, React&#8217;in bile\u015fenleri ne zaman yeniden render edece\u011fine karar vermesini kolayla\u015ft\u0131r\u0131r ve beklenmedik yan etkilerin \u00f6n\u00fcne ge\u00e7er.<\/p>\n<p><strong>Yayg\u0131n Hata: State&#8217;i Do\u011frudan De\u011fi\u015ftirmek<\/strong><\/p>\n<p>Bir nesne veya dizi state&#8217;i tutuyorken, do\u011frudan o state&#8217;in \u00f6zelliklerini de\u011fi\u015ftirmeye \u00e7al\u0131\u015fmak b\u00fcy\u00fck bir hatad\u0131r. React, referans e\u015fitli\u011fini kullanarak state&#8217;in de\u011fi\u015fip de\u011fi\u015fmedi\u011fini kontrol eder. E\u011fer mevcut state nesnesiyle yeni state nesnesi ayn\u0131 referansa sahipse, React g\u00fcncellemeyi alg\u0131lamaz ve bile\u015fen yeniden render edilmez. \u0130\u015fte yanl\u0131\u015f bir \u00f6rnek:<\/p>\n<div class=\"code-block-container\">\n<pre><code>\nfunction YanlisProfilGuncelleme() {\n  const [user, setUser] = useState({ name: 'Ali', age: 30 });\n\n  const handleUpdateAge = () => {\n    \/\/ YANLI\u015e: State do\u011frudan de\u011fi\u015ftiriliyor\n    user.age += 1; \n    setUser(user); \/\/ React bu de\u011fi\u015fikli\u011fi alg\u0131lamayabilir!\n    console.log(\"Yanl\u0131\u015f G\u00fcncelleme:\", user);\n  };\n\n  return (\n    <div>\n      <p>Ad: {user.name}, Ya\u015f: {user.age}<\/p>\n      <button onClick={handleUpdateAge}>Ya\u015f\u0131 Art\u0131r (Yanl\u0131\u015f)<\/button>\n    <\/div>\n  );\n}\n<\/pre>\n<p><\/code>\n<\/div>\n<p>Yukar\u0131daki \u00f6rnekte, <code>user.age += 1;<\/code> sat\u0131r\u0131 mevcut <code>user<\/code> nesnesini do\u011frudan de\u011fi\u015ftirir. Ard\u0131ndan <code>setUser(user);<\/code> \u00e7a\u011fr\u0131s\u0131 yap\u0131lsa bile, <code>user<\/code> nesnesinin referans\u0131 de\u011fi\u015fmedi\u011fi i\u00e7in React, state'in asl\u0131nda de\u011fi\u015fti\u011fini d\u00fc\u015f\u00fcnmeyebilir ve bile\u015feni yeniden render etmeyebilir veya beklenmedik davran\u0131\u015flar sergileyebilir. Do\u011fru yakla\u015f\u0131m, her zaman state'in yeni bir kopyas\u0131n\u0131 olu\u015fturmakt\u0131r.<\/p>\n<p><strong>Do\u011fru Yakla\u015f\u0131m: Immutable G\u00fcncellemeler<\/strong><\/p>\n<p>Bir nesne state'i g\u00fcncellerken spread operat\u00f6r\u00fc (<code>...<\/code>) kullanarak mevcut \u00f6zelliklerini kopyalay\u0131p, ard\u0131ndan sadece de\u011fi\u015ftirmek istedi\u011finiz \u00f6zellikleri belirtmelisiniz. Diziler i\u00e7in de benzer \u015fekilde, slice, map veya spread operat\u00f6r\u00fc gibi y\u00f6ntemlerle yeni bir dizi olu\u015fturmal\u0131s\u0131n\u0131z.<\/p>\n<div class=\"code-block-container\">\n<pre><code>\nfunction DogruProfilGuncelleme() {\n  const [user, setUser] = useState({ name: 'Ali', age: 30 });\n\n  const handleUpdateAge = () => {\n    \/\/ DO\u011eRU: Mevcut state'in yeni bir kopyas\u0131n\u0131 olu\u015ftur\n    setUser(prevUser => ({ \n      ...prevUser, \n      age: prevUser.age + 1 \n    }));\n  };\n\n  const handleUpdateName = () => {\n    \/\/ Ba\u015fka bir \u00f6rnek: name g\u00fcncelleme\n    setUser(prevUser => ({\n      ...prevUser,\n      name: prevUser.name === 'Ali' ? 'Ay\u015fe' : 'Ali'\n    }));\n  };\n\n  return (\n    <div>\n      <p>Ad: {user.name}, Ya\u015f: {user.age}<\/p>\n      <button onClick={handleUpdateAge}>Ya\u015f\u0131 Art\u0131r<\/button>\n      <button onClick={handleUpdateName}>Ad\u0131 De\u011fi\u015ftir<\/button>\n    <\/div>\n  );\n}\n<\/pre>\n<p><\/code>\n<\/div>\n<p>Burada, <code>setUser(prevUser => ({ ...prevUser, age: prevUser.age + 1 }));<\/code> fonksiyonel bir g\u00fcncelleme kullan\u0131yoruz. <code>prevUser<\/code> parametresi, o anki g\u00fcncel state de\u011ferini temsil eder. Yeni bir nesne olu\u015fturup, \u00f6nceki t\u00fcm \u00f6zellikleri kopyalayarak ve sadece <code>age<\/code> \u00f6zelli\u011fini g\u00fcncelleyerek, React'in state de\u011fi\u015fikli\u011fini do\u011fru bir \u015fekilde alg\u0131lamas\u0131n\u0131 sa\u011fl\u0131yoruz. Bu yakla\u015f\u0131m, state'in immutable do\u011fas\u0131n\u0131 korur ve tahmin edilebilir davran\u0131\u015flar sunar.<\/p>\n<p><strong>Vaka Analizi: Bir E-ticaret Sepeti Uygulamas\u0131<\/strong><\/p>\n<p>Bir e-ticaret uygulamas\u0131nda sepetinizdeki \u00fcr\u00fcnlerin miktar\u0131n\u0131 g\u00fcncelledi\u011finizi d\u00fc\u015f\u00fcn\u00fcn. Sepetiniz <code>const [cartItems, setCartItems] = useState([]);<\/code> \u015feklinde bir dizi i\u00e7inde tutuluyor olabilir. E\u011fer bir \u00fcr\u00fcn\u00fcn miktar\u0131n\u0131 art\u0131rmak istiyorsan\u0131z ve do\u011frudan dizideki objeyi mutate ederseniz, React bu de\u011fi\u015fikli\u011fi alg\u0131lamayacakt\u0131r.<\/p>\n<div class=\"code-block-container\">\n<pre><code>\n\/\/ Yanl\u0131\u015f Yakla\u015f\u0131m:\nconst updateQuantityWrong = (productId, newQuantity) => {\n  const itemToUpdate = cartItems.find(item => item.id === productId);\n  if (itemToUpdate) {\n    itemToUpdate.quantity = newQuantity; \/\/ Do\u011frudan mutasyon!\n    setCartItems(cartItems); \/\/ Referans ayn\u0131, React alg\u0131lamaz\n  }\n};\n\n\/\/ Do\u011fru Yakla\u015f\u0131m:\nconst updateQuantityCorrect = (productId, newQuantity) => {\n  setCartItems(prevItems =>\n    prevItems.map(item =>\n      item.id === productId ? { ...item, quantity: newQuantity } : item\n    )\n  );\n};\n<\/pre>\n<p><\/code>\n<\/div>\n<p>Do\u011fru yakla\u015f\u0131mda, <code>map<\/code> fonksiyonunu kullanarak yeni bir dizi olu\u015fturuyor ve sadece ilgili \u00fcr\u00fcn\u00fcn miktar\u0131n\u0131 g\u00fcncellemek i\u00e7in yeni bir obje olu\u015fturuyoruz. Bu, hem state'in immutable kalmas\u0131n\u0131 sa\u011flar hem de React'in UI'\u0131 do\u011fru bir \u015fekilde g\u00fcncellemesini garantiler. Fonksiyonel g\u00fcncelleme (<code>prevItems => ...<\/code>) ayn\u0131 zamanda state g\u00fcncellemelerinin e\u015fzamans\u0131z olabilece\u011fi durumlar i\u00e7in de en g\u00fcvenli y\u00f6ntemdir, \u00e7\u00fcnk\u00fc her zaman en g\u00fcncel state de\u011ferine eri\u015fmenizi sa\u011flar.<\/p>\n<aside class=\"expert-tip\">\n  Uzman \u0130pucu: React, birden fazla <code>setSstate<\/code> \u00e7a\u011fr\u0131s\u0131n\u0131 tek bir render d\u00f6ng\u00fcs\u00fcnde birle\u015ftirebilir (batching). Bu, performans\u0131 art\u0131rmak i\u00e7in harika bir \u00f6zelliktir. Ancak, e\u011fer state g\u00fcncellemeleriniz birbiriyle ili\u015fkili ve \u00f6nceki state de\u011ferine ba\u011fl\u0131ysa, her zaman fonksiyonel g\u00fcncelleme (\u00f6rne\u011fin, <code>setCount(prevCount => prevCount + 1)<\/code>) kullan\u0131n. Bu, race condition'lar\u0131 \u00f6nler ve her zaman do\u011fru state de\u011feri \u00fczerinden i\u015flem yapman\u0131z\u0131 sa\u011flar.<br \/>\n<\/aside>\n<h2>useEffect Ba\u011f\u0131ml\u0131l\u0131klar\u0131n\u0131 Do\u011fru Y\u00f6netmek: Sonsuz D\u00f6ng\u00fclerden Nas\u0131l Kurtulursunuz?<\/h2>\n<p><code>useEffect<\/code>, React'teki fonksiyonel bile\u015fenlerde \"yan etkileri\" (side effects) y\u00f6netmek i\u00e7in kullan\u0131lan bir Hook'tur. Veri \u00e7ekme, abonelikler, manuel DOM de\u011fi\u015fiklikleri, zamanlay\u0131c\u0131lar gibi i\u015flemler <code>useEffect<\/code> i\u00e7inde ger\u00e7ekle\u015ftirilir. Ancak, <code>useEffect<\/code>'in do\u011fru kullan\u0131m\u0131, \u00f6zellikle ba\u011f\u0131ml\u0131l\u0131k dizisi (dependency array) konusunda ba\u015flang\u0131\u00e7 seviyesi geli\u015ftiriciler i\u00e7in kafa kar\u0131\u015ft\u0131r\u0131c\u0131 olabilir. Ba\u011f\u0131ml\u0131l\u0131k dizisini yanl\u0131\u015f y\u00f6netmek, gereksiz yeniden render'lara, performans sorunlar\u0131na veya daha da k\u00f6t\u00fcs\u00fc, sonsuz d\u00f6ng\u00fclere yol a\u00e7abilir.<\/p>\n<p><code>useEffect<\/code> iki arg\u00fcman al\u0131r: bir callback fonksiyonu ve iste\u011fe ba\u011fl\u0131 bir ba\u011f\u0131ml\u0131l\u0131k dizisi. Callback fonksiyonu, bile\u015fen render edildikten sonra \u00e7al\u0131\u015f\u0131r. E\u011fer ba\u011f\u0131ml\u0131l\u0131k dizisi sa\u011flanmazsa, callback her render i\u015fleminden sonra \u00e7al\u0131\u015f\u0131r. Bo\u015f bir dizi (<code>[]<\/code>) sa\u011flan\u0131rsa, callback sadece bile\u015fen monte edildi\u011finde (mount) bir kez \u00e7al\u0131\u015f\u0131r ve demonte edildi\u011finde (unmount) cleanup fonksiyonu varsa \u00e7al\u0131\u015f\u0131r. Ba\u011f\u0131ml\u0131l\u0131k dizisine belirli de\u011fi\u015fkenler eklendi\u011finde ise, bu de\u011fi\u015fkenlerden herhangi biri de\u011fi\u015fti\u011finde callback yeniden \u00e7al\u0131\u015f\u0131r. Buradaki ana mant\u0131k, <code>useEffect<\/code> i\u00e7indeki kodun ne zaman tekrar \u00e7al\u0131\u015fmas\u0131 gerekti\u011fini React'e bildirmektir.<\/p>\n<p><strong>Yayg\u0131n Hata: Ba\u011f\u0131ml\u0131l\u0131klar\u0131 Eksik B\u0131rakmak veya Yanl\u0131\u015f Eklemek<\/strong><\/p>\n<p>Bir <code>useEffect<\/code> i\u00e7inde kullan\u0131lan ancak ba\u011f\u0131ml\u0131l\u0131k dizisine eklenmeyen bir de\u011fi\u015fken veya fonksiyon, kapan\u0131\u015f (closure) nedeniyle ilk render'daki de\u011ferini koruyabilir ve bu durum g\u00fcncel olmayan (stale) verilere yol a\u00e7abilir. \u00d6rne\u011fin, bir saya\u00e7 uygulamas\u0131nda:<\/p>\n<div class=\"code-block-container\">\n<pre><code>\nfunction YanlisSaya\u00e7() {\n  const [count, setCount] = useState(0);\n\n  useEffect(() => {\n    \/\/ YANLI\u015e: count ba\u011f\u0131ml\u0131l\u0131k dizisinde de\u011fil\n    const interval = setInterval(() => {\n      console.log('Count:', count); \/\/ Her zaman 0 g\u00f6sterir!\n      setCount(count + 1); \n    }, 1000);\n    return () => clearInterval(interval);\n  }, []); \/\/ Bo\u015f ba\u011f\u0131ml\u0131l\u0131k dizisi, count'\u0131n ilk de\u011ferini yakalar\n  \n  return <h2>Saya\u00e7: {count}<\/h2>;\n}\n<\/pre>\n<p><\/code>\n<\/div>\n<p>Bu \u00f6rnekte, <code>setInterval<\/code> i\u00e7indeki <code>count<\/code> de\u011feri, <code>useEffect<\/code> ilk kez \u00e7al\u0131\u015ft\u0131\u011f\u0131nda (bile\u015fen mount edildi\u011finde) 0 olarak \"yakalan\u0131r\". Ba\u011f\u0131ml\u0131l\u0131k dizisi bo\u015f oldu\u011fu i\u00e7in, <code>useEffect<\/code> bir daha \u00e7al\u0131\u015fmaz ve <code>count<\/code> her zaman 0 olarak kal\u0131r. <code>setCount(count + 1)<\/code> \u00e7a\u011fr\u0131lsa bile, hep <code>0 + 1<\/code> i\u015flemini yapar ve saya\u00e7 sadece 1'e kadar \u00e7\u0131kar. Bu durum sonsuz d\u00f6ng\u00fcye yol a\u00e7maz, ancak beklenen davran\u0131\u015f\u0131 sergilemez.<\/p>\n<p><strong>Sonsuz D\u00f6ng\u00fcye Yol A\u00e7an Hata: Obje Referanslar\u0131<\/strong><\/p>\n<p>Daha tehlikeli bir hata, ba\u011f\u0131ml\u0131l\u0131k dizisine do\u011frudan bir nesne veya fonksiyon tan\u0131mlad\u0131\u011f\u0131n\u0131zda ortaya \u00e7\u0131kar. Her render'da yeni bir referans de\u011feri olu\u015ftu\u011fu i\u00e7in, <code>useEffect<\/code> s\u00fcrekli olarak bu \"de\u011fi\u015fikli\u011fi\" alg\u0131lar ve tekrar \u00e7al\u0131\u015f\u0131r, bu da sonsuz bir d\u00f6ng\u00fcye neden olur.<\/p>\n<div class=\"code-block-container\">\n<pre><code>\nfunction YanlisVeriCekme() {\n  const [data, setData] = useState(null);\n  const [query, setQuery] = useState('react');\n\n  \/\/ YANLI\u015e: <code>options<\/code> nesnesi her render'da yeniden olu\u015fturulur\n  const options = { method: 'GET', headers: { 'Content-Type': 'application\/json' } };\n\n  useEffect(() => {\n    console.log('Veri \u00e7ekiliyor...');\n    \/\/ Veri \u00e7ekme i\u015flemi (API \u00e7a\u011fr\u0131s\u0131 gibi)\n    fetch(<code>https:\/\/api.example.com\/search?q=${query}<\/code>, options)\n      .then(res => res.json())\n      .then(json => setData(json));\n  }, [query, options]); \/\/ options her render'da yeni bir referanst\u0131r!\n\n  return (\n    <div>\n      <input type=\"text\" value={query} onChange={e => setQuery(e.target.value)} \/>\n      <p>Gelen veri: {data ? JSON.stringify(data) : 'Y\u00fckleniyor...'}<\/p>\n    <\/div>\n  );\n}\n<\/pre>\n<p><\/code>\n<\/div>\n<p>Yukar\u0131daki \u00f6rnekte, <code>options<\/code> nesnesi her render'da yeniden olu\u015fturuldu\u011fu i\u00e7in, <code>useEffect<\/code>'in ba\u011f\u0131ml\u0131l\u0131k dizisinde her zaman \"de\u011fi\u015fmi\u015f\" olarak alg\u0131lan\u0131r. Bu da <code>useEffect<\/code>'in sonsuz bir d\u00f6ng\u00fcye girmesine ve s\u00fcrekli veri \u00e7ekmeye \u00e7al\u0131\u015fmas\u0131na neden olur.<\/p>\n<p><strong>Do\u011fru Yakla\u015f\u0131m: Ba\u011f\u0131ml\u0131l\u0131klar\u0131 Y\u00f6netmek<\/strong><\/p>\n<p>Do\u011fru yakla\u015f\u0131m, <code>useEffect<\/code>'in callback'i i\u00e7inde kullan\u0131lan ve de\u011fi\u015fti\u011finde yan etkinin tekrar \u00e7al\u0131\u015fmas\u0131n\u0131 istedi\u011fimiz t\u00fcm de\u011fi\u015fkenleri ve fonksiyonlar\u0131 ba\u011f\u0131ml\u0131l\u0131k dizisine eklemektir. E\u011fer bir state g\u00fcncelleme fonksiyonu (<code>setCount<\/code> gibi) kullan\u0131l\u0131yorsa, React bu fonksiyonun referans\u0131n\u0131n sabitle\u015fti\u011fini garanti etti\u011fi i\u00e7in ba\u011f\u0131ml\u0131l\u0131k dizisine eklenmesine gerek yoktur. Fonksiyonel g\u00fcncellemeler, kapan\u0131\u015f sorunlar\u0131n\u0131 \u00e7\u00f6zmek i\u00e7in de harika bir yoldur.<\/p>\n<div class=\"code-block-container\">\n<pre><code>\nfunction DogruSaya\u00e7() {\n  const [count, setCount] = useState(0);\n\n  useEffect(() => {\n    const interval = setInterval(() => {\n      \/\/ DO\u011eRU: Fonksiyonel g\u00fcncelleme ile g\u00fcncel state'e eri\u015fim\n      setCount(prevCount => prevCount + 1); \n    }, 1000);\n    return () => clearInterval(interval);\n  }, []); \/\/ Bo\u015f ba\u011f\u0131ml\u0131l\u0131k dizisi, \u00e7\u00fcnk\u00fc setCount'un referans\u0131 de\u011fi\u015fmez\n\n  return <h2>Saya\u00e7: {count}<\/h2>;\n}\n<\/pre>\n<p><\/code>\n<\/div>\n<p>Bu saya\u00e7 \u00f6rne\u011finde, <code>setCount(prevCount => prevCount + 1)<\/code> kullanarak, <code>setInterval<\/code> callback'i her \u00e7al\u0131\u015ft\u0131\u011f\u0131nda en g\u00fcncel <code>count<\/code> de\u011ferine eri\u015fiyoruz. Bu sayede, <code>useEffect<\/code>'in ba\u011f\u0131ml\u0131l\u0131k dizisine <code>count<\/code> eklememize gerek kalmaz ve kapan\u0131\u015f kaynakl\u0131 sorunlar\u0131 a\u015far\u0131z.<\/p>\n<p>Sonsuz d\u00f6ng\u00fc \u00f6rne\u011fi i\u00e7in ise, <code>useMemo<\/code> veya <code>useCallback<\/code> kullanarak nesne veya fonksiyon referanslar\u0131n\u0131n sabit kalmas\u0131n\u0131 sa\u011flamak gerekir:<\/p>\n<div class=\"code-block-container\">\n<pre><code>\nimport React, { useState, useEffect, useMemo } from 'react';\n\nfunction DogruVeriCekme() {\n  const [data, setData] = useState(null);\n  const [query, setQuery] = useState('react');\n\n  \/\/ DO\u011eRU: useMemo ile options nesnesinin referans\u0131n\u0131 sabitle\n  const options = useMemo(() => ({ \n    method: 'GET', \n    headers: { 'Content-Type': 'application\/json' } \n  }), []); \/\/ Ba\u011f\u0131ml\u0131l\u0131k yok, bir kez olu\u015fturulur\n\n  useEffect(() => {\n    console.log('Veri \u00e7ekiliyor (Do\u011fru)...');\n    const fetchData = async () => {\n      try {\n        const response = await fetch(<code>https:\/\/api.example.com\/search?q=${query}<\/code>, options);\n        const json = await response.json();\n        setData(json);\n      } catch (error) {\n        console.error(\"Veri \u00e7ekme hatas\u0131:\", error);\n      }\n    };\n\n    if (query) { \/\/ Sadece bir sorgu varsa \u00e7ek\n      fetchData();\n    }\n    \n  }, [query, options]); \/\/ query de\u011fi\u015fti\u011finde useEffect tekrar \u00e7al\u0131\u015f\u0131r, options referans\u0131 sabittir.\n\n  return (\n    <div>\n      <input type=\"text\" value={query} onChange={e => setQuery(e.target.value)} \/>\n      <p>Gelen veri: {data ? JSON.stringify(data) : 'Y\u00fckleniyor...'}<\/p>\n    <\/div>\n  );\n}\n<\/pre>\n<p><\/code>\n<\/div>\n<p>Burada <code>useMemo<\/code> kullanarak <code>options<\/code> nesnesinin sadece bir kez olu\u015fturulmas\u0131n\u0131 sa\u011fl\u0131yoruz. B\u00f6ylece, <code>options<\/code>'\u0131n referans\u0131 her render'da de\u011fi\u015fmez ve <code>useEffect<\/code> sadece <code>query<\/code> de\u011fi\u015fti\u011finde yeniden \u00e7al\u0131\u015f\u0131r. Bu, sonsuz d\u00f6ng\u00fc problemini \u00e7\u00f6zer ve performans\u0131 art\u0131r\u0131r.<\/p>\n<aside class=\"expert-tip\">\n  Uzman \u0130pucu: <code>useEffect<\/code>'te bir abonelik (subscription) veya zamanlay\u0131c\u0131 (timer) ba\u015flatt\u0131\u011f\u0131n\u0131zda, bile\u015fen demonte edildi\u011finde veya ba\u011f\u0131ml\u0131l\u0131klar de\u011fi\u015fti\u011finde bu kayna\u011f\u0131 temizlemeyi unutmay\u0131n. Callback fonksiyonundan bir temizleme fonksiyonu d\u00f6nd\u00fcrerek (<code>return () => unsubscribe()<\/code>) bunu sa\u011flayabilirsiniz. Bu, bellek s\u0131z\u0131nt\u0131lar\u0131n\u0131 ve istenmeyen yan etkileri \u00f6nler.<br \/>\n<\/aside>\n<h2>Her \u015eeyi Tek Bir useEffect'e Mi T\u0131k\u0131yorsunuz? Etkili Yan Etki Y\u00f6netimi<\/h2>\n<p>React Hooks ile \u00e7al\u0131\u015fmaya ba\u015flayan geli\u015ftiricilerin yapt\u0131\u011f\u0131 bir ba\u015fka yayg\u0131n hata, t\u00fcm yan etkilerini tek bir b\u00fcy\u00fck <code>useEffect<\/code> Hook'unun i\u00e7ine s\u0131\u011fd\u0131rmaya \u00e7al\u0131\u015fmakt\u0131r. Geleneksel s\u0131n\u0131f tabanl\u0131 bile\u015fenlerdeki <code>componentDidMount<\/code>, <code>componentDidUpdate<\/code> ve <code>componentWillUnmount<\/code> gibi ya\u015fam d\u00f6ng\u00fcs\u00fc metodlar\u0131n\u0131 tek bir <code>useEffect<\/code> i\u00e7inde taklit etme e\u011filimi vard\u0131r. Ancak bu yakla\u015f\u0131m, kodun okunabilirli\u011fini, y\u00f6netilebilirli\u011fini ve test edilebilirli\u011fini ciddi \u015fekilde azalt\u0131r.<\/p>\n<p>Tek bir <code>useEffect<\/code> i\u00e7inde birden fazla, birbiriyle ilgisiz yan etkiyi birle\u015ftirmek, \u00f6zellikle ba\u011f\u0131ml\u0131l\u0131k dizisini do\u011fru bir \u015fekilde y\u00f6netmeyi \u00e7ok zorla\u015ft\u0131r\u0131r. Her bir yan etki farkl\u0131 ba\u011f\u0131ml\u0131l\u0131klara sahip olabilir ve bu ba\u011f\u0131ml\u0131l\u0131klar\u0131n tamam\u0131n\u0131 tek bir diziye eklemek, Hook'un gere\u011finden fazla \u00e7al\u0131\u015fmas\u0131na neden olabilir. Bu durum hem performans sorunlar\u0131na yol a\u00e7ar hem de hangi de\u011fi\u015fikli\u011fin hangi yan etkiyi tetikledi\u011fini anlamay\u0131 zorla\u015ft\u0131r\u0131r.<\/p>\n<p><strong>Yayg\u0131n Hata: Monolitik useEffect<\/strong><\/p>\n<p>Bir e-ticaret sayfas\u0131nda \u00fcr\u00fcn listesini \u00e7ekmek, kullan\u0131c\u0131 aktivitelerini loglamak ve bir bile\u015fen mounted edildi\u011finde bir animasyonu tetiklemek gibi farkl\u0131 i\u015flevleri tek bir <code>useEffect<\/code> i\u00e7inde toplad\u0131\u011f\u0131n\u0131z\u0131 hayal edin:<\/p>\n<div class=\"code-block-container\">\n<pre><code>\nfunction YanlisMonolitikKomponent() {\n  const [products, setProducts] = useState([]);\n  const [currentPage, setCurrentPage] = useState(1);\n  const [searchTerm, setSearchTerm] = useState('');\n\n  useEffect(() => {\n    \/\/ YANLI\u015e: T\u00fcm yan etkiler tek bir yerde\n\n    \/\/ 1. \u00dcr\u00fcn verisi \u00e7ekme (currentPage, searchTerm'e ba\u011fl\u0131)\n    const fetchProducts = async () => {\n      console.log(<code>\u00dcr\u00fcnler \u00e7ekiliyor: Sayfa ${currentPage}, Arama: ${searchTerm}<\/code>);\n      const response = await fetch(<code>\/api\/products?page=${currentPage}&search=${searchTerm}<\/code>);\n      const data = await response.json();\n      setProducts(data);\n    };\n    fetchProducts();\n\n    \/\/ 2. Kullan\u0131c\u0131 etkinli\u011fini loglama (Hi\u00e7bir \u015feye ba\u011fl\u0131 de\u011fil, sadece mount'ta loglanmal\u0131)\n    console.log('Kullan\u0131c\u0131 ana sayfaya giri\u015f yapt\u0131.'); \n\n    \/\/ 3. Bir animasyon ba\u015flatma (Sadece mount'ta olmal\u0131)\n    const animationTimer = setTimeout(() => {\n      console.log('Ho\u015f geldiniz animasyonu ba\u015flat\u0131ld\u0131!');\n    }, 1000);\n\n    \/\/ Temizleme fonksiyonu:\n    return () => {\n      clearTimeout(animationTimer);\n      \/\/ Di\u011fer temizlikler...\n    };\n\n  }, [currentPage, searchTerm]); \/\/ T\u00fcm ba\u011f\u0131ml\u0131l\u0131klar burada\n\n  return (\n    <div>\n      <h2>\u00dcr\u00fcn Listesi<\/h2>\n      <input \n        type=\"text\" \n        value={searchTerm} \n        onChange={e => setSearchTerm(e.target.value)} \n        placeholder=\"\u00dcr\u00fcn Ara...\" \n      \/>\n      <ul>\n        {products.map(product => (\n          <li key={product.id}>{product.name}<\/li>\n        ))}\n      <\/ul>\n      <button onClick={() => setCurrentPage(prev => prev + 1)}>Sonraki Sayfa<\/button>\n    <\/div>\n  );\n}\n<\/pre>\n<p><\/code>\n<\/div>\n<p>Yukar\u0131daki \u00f6rnekte, <code>currentPage<\/code> veya <code>searchTerm<\/code> de\u011fi\u015fti\u011finde, sadece \u00fcr\u00fcn verisinin \u00e7ekilmesi gerekirken, \"Kullan\u0131c\u0131 ana sayfaya giri\u015f yapt\u0131.\" mesaj\u0131 yeniden loglan\u0131r ve \"Ho\u015f geldiniz animasyonu ba\u015flat\u0131ld\u0131!\" mesaj\u0131 da gereksiz yere tekrar \u00e7al\u0131\u015f\u0131r. Bu, kaynak israf\u0131na ve beklenmedik davran\u0131\u015flara neden olur. Her bir yan etkinin kendi tetikleyicileri ve ya\u015fam d\u00f6ng\u00fcs\u00fc kurallar\u0131 olmas\u0131 gerekirken, hepsi ayn\u0131 ba\u011f\u0131ml\u0131l\u0131klar k\u00fcmesine ba\u011fl\u0131d\u0131r.<\/p>\n<p><strong>Do\u011fru Yakla\u015f\u0131m: Yan Etkileri Ay\u0131rmak<\/strong><\/p>\n<p>Her bir yan etkiyi kendi ba\u011f\u0131ms\u0131z <code>useEffect<\/code> Hook'una ay\u0131rmak, kodunuzu \u00e7ok daha d\u00fczenli, anla\u015f\u0131l\u0131r ve bak\u0131m\u0131 kolay hale getirir. Her <code>useEffect<\/code> Hook'u, kendi \u00f6zel sorumlulu\u011funu \u00fcstlenir ve yaln\u0131zca kendi ba\u011f\u0131ml\u0131l\u0131klar\u0131 de\u011fi\u015fti\u011finde yeniden \u00e7al\u0131\u015f\u0131r.<\/p>\n<div class=\"code-block-container\">\n<pre><code>\nimport React, { useState, useEffect } from 'react';\n\nfunction DogruAyr\u0131kKomponent() {\n  const [products, setProducts] = useState([]);\n  const [currentPage, setCurrentPage] = useState(1);\n  const [searchTerm, useStateSearchTerm] = useState('');\n\n  \/\/ 1. Yan Etki: \u00dcr\u00fcn verisi \u00e7ekme\n  useEffect(() => {\n    const fetchProducts = async () => {\n      console.log(<code>\u00dcr\u00fcnler \u00e7ekiliyor: Sayfa ${currentPage}, Arama: ${searchTerm}<\/code>);\n      try {\n        const response = await fetch(<code>\/api\/products?page=${currentPage}&search=${searchTerm}<\/code>);\n        const data = await response.json();\n        setProducts(data);\n      } catch (error) {\n        console.error(\"\u00dcr\u00fcn \u00e7ekme hatas\u0131:\", error);\n      }\n    };\n    fetchProducts();\n  }, [currentPage, searchTerm]); \/\/ Sadece currentPage veya searchTerm de\u011fi\u015fti\u011finde \u00e7al\u0131\u015f\u0131r\n\n  \/\/ 2. Yan Etki: Kullan\u0131c\u0131 etkinli\u011fini loglama (sadece mount'ta)\n  useEffect(() => {\n    console.log('Kullan\u0131c\u0131 ana sayfaya giri\u015f yapt\u0131.');\n    \/\/ Bu sadece bir kez \u00e7al\u0131\u015f\u0131r, \u00e7\u00fcnk\u00fc ba\u011f\u0131ml\u0131l\u0131k dizisi bo\u015f\n  }, []); \n\n  \/\/ 3. Yan Etki: Bir animasyon ba\u015flatma (sadece mount'ta, temizleme ile)\n  useEffect(() => {\n    const animationTimer = setTimeout(() => {\n      console.log('Ho\u015f geldiniz animasyonu ba\u015flat\u0131ld\u0131!');\n    }, 1000);\n\n    return () => {\n      console.log('Animasyon zamanlay\u0131c\u0131s\u0131 temizlendi.');\n      clearTimeout(animationTimer);\n    };\n  }, []); \/\/ Sadece mount'ta ve unmount'ta temizlenir\n\n  return (\n    <div>\n      <h2>\u00dcr\u00fcn Listesi<\/h2>\n      <input \n        type=\"text\" \n        value={searchTerm} \n        onChange={e => useStateSearchTerm(e.target.value)} \n        placeholder=\"\u00dcr\u00fcn Ara...\" \n      \/>\n      <ul>\n        {products.map(product => (\n          <li key={product.id}>{product.name}<\/li>\n        ))}\n      <\/ul>\n      <button onClick={() => setCurrentPage(prev => prev + 1)}>Sonraki Sayfa<\/button>\n    <\/div>\n  );\n}\n<\/pre>\n<p><\/code>\n<\/div>\n<p>Bu revize edilmi\u015f bile\u015fende, her bir yan etki kendi <code>useEffect<\/code> Hook'u i\u00e7inde izole edilmi\u015ftir. Bu, a\u015fa\u011f\u0131daki avantajlar\u0131 sa\u011flar:<\/p>\n<ul>\n<li><strong>Daha \u0130yi Okunabilirlik:<\/strong> Her <code>useEffect<\/code>'in ne i\u015f yapt\u0131\u011f\u0131n\u0131 anlamak daha kolayd\u0131r.<\/li>\n<li><strong>Daha Kolay Bak\u0131m:<\/strong> Bir yan etkide de\u011fi\u015fiklik yapman\u0131z gerekti\u011finde, di\u011ferlerini etkilemeden do\u011frudan ilgili <code>useEffect<\/code> Hook'una odaklanabilirsiniz.<\/li>\n<li><strong>Do\u011fru Ba\u011f\u0131ml\u0131l\u0131k Y\u00f6netimi:<\/strong> Her <code>useEffect<\/code> kendi \u00f6zel ba\u011f\u0131ml\u0131l\u0131k dizisine sahiptir, bu da gereksiz \u00e7al\u0131\u015ft\u0131rmalar\u0131 engeller ve performans sorunlar\u0131n\u0131 azalt\u0131r.<\/li>\n<li><strong>Daha Kolay Test Edilebilirlik:<\/strong> Her bir yan etkiyi ayr\u0131 ayr\u0131 test etmek daha basittir.<\/li>\n<\/ul>\n<p><strong>Vaka Analizi: Bir Kullan\u0131c\u0131 Formu<\/strong><\/p>\n<p>Bir kullan\u0131c\u0131 profil formunda, hem kullan\u0131c\u0131n\u0131n verilerini \u00e7ekmeniz, hem form giri\u015flerini izlemeniz, hem de belki de formun g\u00f6nderilme durumuna g\u00f6re bir geri bildirim g\u00f6stermeniz gerekebilir. Bu senaryoda da yan etkileri ay\u0131rmak \u00f6nemlidir:<\/p>\n<ul>\n<li>Kullan\u0131c\u0131 verilerini \u00e7ekme: <code>useEffect(() => { \/* fetch user data *\/ }, [userId]);<\/code><\/li>\n<li>Form do\u011frulama (inputlar de\u011fi\u015ftik\u00e7e): <code>useEffect(() => { \/* validate form *\/ }, [formData]);<\/code><\/li>\n<li>Form g\u00f6nderme ve ba\u015far\u0131l\u0131 oldu\u011funda bildirim g\u00f6sterme: <code>useEffect(() => { \/* show success message *\/ }, [isSubmittedSuccessfully]);<\/code><\/li>\n<\/ul>\n<p>Bu \u015fekilde, her bir <code>useEffect<\/code> kendi mant\u0131\u011f\u0131n\u0131 ve ba\u011f\u0131ml\u0131l\u0131klar\u0131n\u0131 izler, b\u00f6ylece bile\u015fen daha \u00f6ng\u00f6r\u00fclebilir ve y\u00f6netilebilir hale gelir. React Hooks'un g\u00fcc\u00fc, yan etkileri soyutlama ve ayr\u0131 ayr\u0131 y\u00f6netme yetene\u011finde yatar, bu y\u00fczden bu yetene\u011fi tam olarak kullanmaktan \u00e7ekinmeyin.<\/p>\n<aside class=\"expert-tip\">\n  Uzman \u0130pucu: Bir <code>useEffect<\/code>'in \u00e7ok karma\u015f\u0131k hale geldi\u011fini veya \u00e7ok fazla ba\u011f\u0131ml\u0131l\u0131\u011fa sahip oldu\u011funu fark ederseniz, bu genellikle daha k\u00fc\u00e7\u00fck, \u00f6zel Hook'lara (custom hooks) b\u00f6lme zaman\u0131n\u0131n geldi\u011fine dair bir i\u015farettir. \u00d6zel Hook'lar, karma\u015f\u0131k stateful mant\u0131\u011f\u0131 yeniden kullan\u0131labilir bir \u015fekilde soyutlaman\u0131za olanak tan\u0131r ve bile\u015fenlerinizi daha temiz tutar.<br \/>\n<\/aside>\n<h2>Referans E\u015fitli\u011fini G\u00f6z Ard\u0131 Etmek: Yeniden Olu\u015fturma ve Performans Sorunlar\u0131<\/h2>\n<p>React, performans\u0131 optimize etmek i\u00e7in bile\u015fenleri yaln\u0131zca state veya props de\u011fi\u015fti\u011finde yeniden render eder. Ancak, bu \"de\u011fi\u015fiklik\" kavram\u0131, nesneler ve fonksiyonlar s\u00f6z konusu oldu\u011funda referans e\u015fitli\u011fi prensibine dayan\u0131r. Ba\u015flang\u0131\u00e7 seviyesi geli\u015ftiriciler, JavaScript'in nesnelerle ve fonksiyonlarla \u00e7al\u0131\u015fma \u015feklindeki bu n\u00fcans\u0131 genellikle g\u00f6zden ka\u00e7\u0131r\u0131r ve bu da gereksiz yeniden olu\u015fturmalara (re-renders) ve ciddi performans d\u00fc\u015f\u00fc\u015flerine yol a\u00e7abilir.<\/p>\n<p>JavaScript'te, iki nesne veya fonksiyon, i\u00e7erikleri ayn\u0131 olsa bile, bellekte farkl\u0131 yerlerde depolan\u0131yorsa (yani referanslar\u0131 farkl\u0131ysa) e\u015fit kabul edilmezler. Her render d\u00f6ng\u00fcs\u00fcnde, bir fonksiyonel bile\u015fen yeniden \u00e7al\u0131\u015f\u0131r ve bu s\u0131rada i\u00e7inde tan\u0131mlanan her nesne ve fonksiyon yeniden olu\u015fturulur, dolay\u0131s\u0131yla yeni bir referansa sahip olur. Bu durum, \u00f6zellikle bu nesne veya fonksiyonlar\u0131n alt bile\u015fenlere prop olarak ge\u00e7ti\u011fi veya <code>useEffect<\/code> ba\u011f\u0131ml\u0131l\u0131k dizisinde kullan\u0131ld\u0131\u011f\u0131 durumlarda sorunlara neden olabilir.<\/p>\n<p><strong>Yayg\u0131n Hata: Inline Nesneler ve Fonksiyonlar<\/strong><\/p>\n<p>Bir prop olarak alt bile\u015fene bir nesne veya fonksiyon ge\u00e7irdi\u011finizde, bu alt bile\u015fen <code>React.memo<\/code> ile optimize edilmi\u015f olsa bile, \u00fcst bile\u015fen her yeniden render oldu\u011funda yeni bir referans alaca\u011f\u0131 i\u00e7in alt bile\u015fen de gereksiz yere yeniden render olur:<\/p>\n<div class=\"code-block-container\">\n<pre><code>\nimport React, { useState, memo } from 'react';\n\n\/\/ Alt Bile\u015fen: Sadece 'props.onClick' de\u011fi\u015fti\u011finde yeniden render olmal\u0131\nconst Button = memo(({ onClick, label }) => {\n  console.log(<code>${label} butonu render edildi<\/code>);\n  return <button onClick={onClick}>{label}<\/button>;\n});\n\nfunction YanlisUstuBilesen() {\n  const [count, setCount] = useState(0);\n\n  \/\/ YANLI\u015e: handleIncrement her render'da yeniden olu\u015fturulur\n  const handleIncrement = () => {\n    setCount(prevCount => prevCount + 1);\n  };\n\n  \/\/ YANLI\u015e: data objesi her render'da yeniden olu\u015fturulur\n  const data = { value: count }; \n\n  return (\n    <div>\n      <h2>Saya\u00e7: {count}<\/h2>\n      <Button onClick={handleIncrement} label=\"Art\u0131r\" \/>\n      <p>Data de\u011feri: {data.value}<\/p>\n      <button onClick={() => setCount(0)}>S\u0131f\u0131rla<\/button>\n    <\/div>\n  );\n}\n<\/pre>\n<p><\/code>\n<\/div>\n<p>Yukar\u0131daki \u00f6rnekte, <code>YanlisUstuBilesen<\/code> her render oldu\u011funda (\u00f6rne\u011fin \"S\u0131f\u0131rla\" butonuna bas\u0131ld\u0131\u011f\u0131nda), <code>handleIncrement<\/code> fonksiyonu ve <code>data<\/code> nesnesi yeniden olu\u015fturulur. <code>Button<\/code> bile\u015feni <code>React.memo<\/code> ile optimize edilmi\u015f olsa bile, <code>onClick<\/code> prop'unun referans\u0131 her render'da de\u011fi\u015fti\u011fi i\u00e7in <code>Button<\/code> bile\u015feni de her seferinde yeniden render olur. Bu k\u00fc\u00e7\u00fck bir \u00f6rnekte fark edilmeyebilir ancak b\u00fcy\u00fck ve karma\u015f\u0131k uygulamalarda ciddi performans sorunlar\u0131na yol a\u00e7abilir.<\/p>\n<p>Benzer bir sorun, bir fonksiyon veya nesnenin <code>useEffect<\/code> ba\u011f\u0131ml\u0131l\u0131k dizisinde kullan\u0131lmas\u0131 durumunda da ortaya \u00e7\u0131kar. E\u011fer ba\u011f\u0131ml\u0131l\u0131k dizisindeki bir nesne veya fonksiyon her render'da yeni bir referans al\u0131yorsa, <code>useEffect<\/code> gereksiz yere tekrar \u00e7al\u0131\u015f\u0131r, bu da performans kayb\u0131na veya beklenmedik yan etkilere neden olabilir.<\/p>\n<p><strong>Do\u011fru Yakla\u015f\u0131m: useMemo ve useCallback ile Referans E\u015fitli\u011fini Korumak<\/strong><\/p>\n<p>React, bu t\u00fcr performans sorunlar\u0131n\u0131 \u00e7\u00f6zmek i\u00e7in iki \u00f6zel Hook sunar: <code>useCallback<\/code> ve <code>useMemo<\/code>. Bu Hook'lar, pahal\u0131 hesaplamalar\u0131 veya fonksiyon tan\u0131mlamalar\u0131n\u0131 \u00f6nbelle\u011fe alman\u0131za (memoize etmenize) olanak tan\u0131r, b\u00f6ylece yaln\u0131zca ba\u011f\u0131ml\u0131l\u0131klar\u0131 de\u011fi\u015fti\u011finde yeniden olu\u015fturulurlar.<\/p>\n<ul>\n<li><code>useCallback(callback, dependencies)<\/code>: Bir fonksiyonu \u00f6nbelle\u011fe al\u0131r. Yaln\u0131zca ba\u011f\u0131ml\u0131l\u0131klar\u0131 de\u011fi\u015fti\u011finde fonksiyonun yeni bir referans\u0131n\u0131 d\u00f6nd\u00fcr\u00fcr. Alt bile\u015fenlere prop olarak ge\u00e7ecek fonksiyonlar i\u00e7in idealdir.<\/li>\n<li><code>useMemo(callback, dependencies)<\/code>: Bir de\u011ferin (nesne, dizi, say\u0131 vb.) sonucunu \u00f6nbelle\u011fe al\u0131r. Yaln\u0131zca ba\u011f\u0131ml\u0131l\u0131klar\u0131 de\u011fi\u015fti\u011finde callback'i yeniden \u00e7al\u0131\u015ft\u0131r\u0131r ve yeni de\u011feri d\u00f6nd\u00fcr\u00fcr. \u00d6zellikle pahal\u0131 hesaplamalar\u0131n sonucunu veya alt bile\u015fenlere ge\u00e7ecek nesne prop'lar\u0131n\u0131 optimize etmek i\u00e7in kullan\u0131l\u0131r.<\/li>\n<\/ul>\n<div class=\"code-block-container\">\n<pre><code>\nimport React, { useState, memo, useCallback, useMemo } from 'react';\n\n\/\/ Alt Bile\u015fen: Sadece 'props.onClick' de\u011fi\u015fti\u011finde yeniden render olmal\u0131\nconst Button = memo(({ onClick, label }) => {\n  console.log(<code>${label} butonu render edildi<\/code>);\n  return <button onClick={onClick}>{label}<\/button>;\n});\n\nfunction DogruUstuBilesen() {\n  const [count, setCount] = useState(0);\n\n  \/\/ DO\u011eRU: useCallback ile handleIncrement fonksiyonunun referans\u0131n\u0131 sabitle\n  const handleIncrement = useCallback(() => {\n    setCount(prevCount => prevCount + 1);\n  }, []); \/\/ Ba\u011f\u0131ml\u0131l\u0131k dizisi bo\u015f, \u00e7\u00fcnk\u00fc setCount'un referans\u0131 sabit\n\n  \/\/ DO\u011eRU: useMemo ile data objesinin referans\u0131n\u0131 sabitle\n  const data = useMemo(() => ({ value: count }), [count]); \n\n  return (\n    <div>\n      <h2>Saya\u00e7: {count}<\/h2>\n      <Button onClick={handleIncrement} label=\"Art\u0131r\" \/>\n      <p>Data de\u011feri: {data.value}<\/p>\n      <button onClick={() => setCount(0)}>S\u0131f\u0131rla<\/button>\n    <\/div>\n  );\n}\n<\/pre>\n<p><\/code>\n<\/div>\n<p>Bu do\u011fru yakla\u015f\u0131mda, <code>handleIncrement<\/code> fonksiyonu <code>useCallback<\/code> ile sar\u0131lm\u0131\u015ft\u0131r. Ba\u011f\u0131ml\u0131l\u0131k dizisi bo\u015f (<code>[]<\/code>) oldu\u011fu i\u00e7in, bu fonksiyon bile\u015fenin ya\u015fam d\u00f6ng\u00fcs\u00fc boyunca ayn\u0131 referansa sahip olur. Benzer \u015fekilde, <code>data<\/code> nesnesi <code>useMemo<\/code> ile sar\u0131lm\u0131\u015ft\u0131r ve sadece <code>count<\/code> de\u011feri de\u011fi\u015fti\u011finde yeniden olu\u015fturulur. Bu sayede, <code>DogruUstuBilesen<\/code> yeniden render oldu\u011funda (\u00f6rne\u011fin \"S\u0131f\u0131rla\" butonu ile), <code>Button<\/code> bile\u015feni gereksiz yere yeniden render olmaz, \u00e7\u00fcnk\u00fc <code>onClick<\/code> prop'unun referans\u0131 de\u011fi\u015fmez. Bu teknik, \u00f6zellikle liste render'lar\u0131 veya yo\u011fun hesaplamalar i\u00e7eren bile\u015fenler i\u00e7in kritik \u00f6neme sahiptir.<\/p>\n<p><strong>Vaka Analizi: B\u00fcy\u00fck Bir Tablo Bile\u015feni<\/strong><\/p>\n<p>B\u00fcy\u00fck bir veri tablosu d\u00fc\u015f\u00fcn\u00fcn. Her sat\u0131rda bir dizi i\u015flem butonu (D\u00fczenle, Sil vb.) bulunuyor. E\u011fer bu i\u015flem butonlar\u0131n\u0131n <code>onClick<\/code> handler'lar\u0131n\u0131 her sat\u0131rda inline olarak veya <code>useCallback<\/code> kullanmadan tan\u0131mlarsan\u0131z, her tablonun yeniden render olmas\u0131nda t\u00fcm sat\u0131rlar ve butonlar gereksiz yere yeniden render olacakt\u0131r. <code>useCallback<\/code> kullanarak bu handler'lar\u0131 optimize etmek, \u00f6zellikle y\u00fczlerce veya binlerce sat\u0131r i\u00e7eren tablolarda performans\u0131 g\u00f6zle g\u00f6r\u00fcl\u00fcr \u015fekilde art\u0131rabilir.<\/p>\n<aside class=\"expert-tip\">\n  Uzman \u0130pucu: <code>useCallback<\/code> ve <code>useMemo<\/code> her zaman kullan\u0131lmas\u0131 gereken sihirli de\u011fnekler de\u011fildir. A\u015f\u0131r\u0131 kullan\u0131mlar\u0131, Hook'lar\u0131n kendilerinin getirdi\u011fi ek karma\u015f\u0131kl\u0131k ve haf\u0131za maliyeti nedeniyle performans\u0131 d\u00fc\u015f\u00fcrebilir. Bu Hook'lar\u0131 yaln\u0131zca \u00f6l\u00e7\u00fclebilir performans sorunlar\u0131 ya\u015fad\u0131\u011f\u0131n\u0131zda veya alt bile\u015fenlerin (\u00f6zellikle <code>React.memo<\/code> ile sar\u0131lm\u0131\u015f olanlar\u0131n) gereksiz yere yeniden render olmas\u0131n\u0131 engellemek istedi\u011finizde kullanmal\u0131s\u0131n\u0131z. Her zaman \u00f6ncelikle performans\u0131 \u00f6l\u00e7\u00fcn!<br \/>\n<\/aside>\n<h2>Kendi Hook'lar\u0131n\u0131z\u0131 Yanl\u0131\u015f Yere Mi Yaz\u0131yorsunuz? \u00d6zel Hook Kurallar\u0131<\/h2>\n<p>React Hooks'un en g\u00fc\u00e7l\u00fc \u00f6zelliklerinden biri, \u00f6zel Hook'lar (Custom Hooks) olu\u015fturma yetene\u011fidir. \u00d6zel Hook'lar, stateful mant\u0131\u011f\u0131 fonksiyonel bile\u015fenler aras\u0131nda yeniden kullan\u0131labilir bir \u015fekilde payla\u015fman\u0131za olanak tan\u0131r. Ancak, Hooks'un belirli \"Kurallar\u0131\" vard\u0131r ve bu kurallar\u0131 ihlal etmek, uygulaman\u0131zda beklenmedik hatalara, \u00f6ng\u00f6r\u00fclemez davran\u0131\u015flara ve hatta \u00e7al\u0131\u015fma zaman\u0131 hatalar\u0131na yol a\u00e7abilir. Ba\u015flang\u0131\u00e7 seviyesi geli\u015ftiriciler genellikle bu kurallar\u0131 g\u00f6z ard\u0131 ederler.<\/p>\n<p>React'in iki temel Hook kural\u0131 vard\u0131r:<\/p>\n<ol>\n<li><strong>Sadece React Fonksiyonlar\u0131n\u0131n En \u00dcst Seviyesinde \u00c7a\u011f\u0131r\u0131n:<\/strong> Hook'lar\u0131 d\u00f6ng\u00fclerin, ko\u015fullu ifadelerin veya i\u00e7 i\u00e7e fonksiyonlar\u0131n i\u00e7inde \u00e7a\u011f\u0131ramazs\u0131n\u0131z. Her zaman React fonksiyonel bile\u015feninin veya ba\u015fka bir \u00f6zel Hook'un en \u00fcst seviyesinde \u00e7a\u011f\u0131rmal\u0131s\u0131n\u0131z.<\/li>\n<li><strong>Sadece React Fonksiyonlar\u0131ndan \u00c7a\u011f\u0131r\u0131n:<\/strong> Hook'lar\u0131 sadece fonksiyonel React bile\u015fenlerinden veya \u00f6zel Hook'lardan \u00e7a\u011f\u0131rabilirsiniz. S\u0131radan JavaScript fonksiyonlar\u0131ndan Hook \u00e7a\u011f\u0131ramazs\u0131n\u0131z.<\/li>\n<\/ol>\n<p>Bu kurallar, React'in Hook'lar\u0131n s\u0131ras\u0131n\u0131 her render'da tutarl\u0131 bir \u015fekilde takip etmesini ve do\u011fru state'i do\u011fru Hook'a atamas\u0131n\u0131 sa\u011flamak i\u00e7in kritik \u00f6neme sahiptir. React, Hook'lar\u0131 bir dizi gibi y\u00f6netir; her render'da ayn\u0131 s\u0131rayla \u00e7a\u011fr\u0131lmalar\u0131n\u0131 bekler.<\/p>\n<p><strong>Yayg\u0131n Hata: Ko\u015fullu veya D\u00f6ng\u00fc \u0130\u00e7inde Hook \u00c7a\u011f\u0131rmak<\/strong><\/p>\n<p>Bir state'i veya efekti belirli bir ko\u015fula ba\u011fl\u0131 olarak tan\u0131mlamak istedi\u011finizde, Hook'u ko\u015fulun i\u00e7ine yerle\u015ftirmek b\u00fcy\u00fck bir hatad\u0131r:<\/p>\n<div class=\"code-block-container\">\n<pre><code>\nfunction YanlisKosulluHook() {\n  const [shouldShow, setShouldShow] = useState(false);\n\n  if (shouldShow) {\n    \/\/ YANLI\u015e: Hook bir ko\u015fullu blo\u011fun i\u00e7inde \u00e7a\u011fr\u0131ld\u0131\n    const [value, setValue] = useState(0); \n    useEffect(() => {\n      console.log(\"De\u011fer:\", value);\n    }, [value]);\n  }\n\n  \/\/ Ba\u015fka bir \u00f6rnek: D\u00f6ng\u00fc i\u00e7inde Hook\n  \/\/ const items = [1, 2, 3];\n  \/\/ items.forEach(() => {\n  \/\/   const [itemState, setItemState] = useState(false); \/\/ YANLI\u015e!\n  \/\/ });\n\n  return (\n    <div>\n      <button onClick={() => setShouldShow(!shouldShow)}>G\u00f6ster\/Gizle<\/button>\n      {\/* value ve setValue'a eri\u015fim burada m\u00fcmk\u00fcn olmayabilir *\/}\n    <\/div>\n  );\n}\n<\/pre>\n<p><\/code>\n<\/div>\n<p>Bu \u00f6rnekte, <code>shouldShow<\/code> de\u011feri de\u011fi\u015fti\u011finde, <code>useState<\/code> ve <code>useEffect<\/code> \u00e7a\u011fr\u0131lar\u0131n\u0131n s\u0131ras\u0131 de\u011fi\u015fir. React, bir sonraki render'da farkl\u0131 say\u0131da veya s\u0131rayla Hook'larla kar\u015f\u0131la\u015ft\u0131\u011f\u0131nda kafas\u0131 kar\u0131\u015f\u0131r ve \"Rendered fewer hooks than expected\" gibi hatalar f\u0131rlat\u0131r. Bu kurallar, \u00f6zellikle \u00f6zel Hook'lar olu\u015ftururken daha da kritik hale gelir.<\/p>\n<p><strong>Do\u011fru Yakla\u015f\u0131m: Ko\u015fullar\u0131 Hook \u0130\u00e7ine Ta\u015f\u0131mak veya Hook'u \u00dcstte Tutmak<\/strong><\/p>\n<p>Hook'lar\u0131 her zaman fonksiyonel bile\u015fenin veya \u00f6zel Hook'un en \u00fcst seviyesinde \u00e7a\u011f\u0131rmal\u0131, ko\u015fullu mant\u0131\u011f\u0131 Hook'lar\u0131n i\u00e7ine ta\u015f\u0131mal\u0131s\u0131n\u0131z. State'in veya yan etkinin kendisi ko\u015fullu olabilir, ancak Hook \u00e7a\u011fr\u0131s\u0131n\u0131n kendisi ko\u015fullu olmamal\u0131d\u0131r.<\/p>\n<div class=\"code-block-container\">\n<pre><code>\nfunction DogruKosulluHook() {\n  const [shouldShow, setShouldShow] = useState(false);\n  \/\/ DO\u011eRU: Hook'lar en \u00fcst seviyede \u00e7a\u011fr\u0131l\u0131r\n  const [value, setValue] = useState(0); \n\n  useEffect(() => {\n    \/\/ DO\u011eRU: Ko\u015fullu mant\u0131k effect'in i\u00e7inde yer al\u0131r\n    if (shouldShow) {\n      console.log(\"De\u011fer:\", value);\n    }\n  }, [shouldShow, value]);\n\n  const handleToggle = () => {\n    setShouldShow(!shouldShow);\n    \/\/ Belki de sadece g\u00f6sterildi\u011finde de\u011feri art\u0131rmak istersiniz\n    if (!shouldShow) { \/\/ Gizliden g\u00f6sterilmeye ge\u00e7erken\n      setValue(prev => prev + 1);\n    }\n  };\n\n  return (\n    <div>\n      <button onClick={handleToggle}>G\u00f6ster\/Gizle<\/button>\n      {shouldShow && <p>G\u00f6sterilen De\u011fer: {value}<\/p>}\n    <\/div>\n  );\n}\n<\/pre>\n<p><\/code>\n<\/div>\n<p>Bu do\u011fru \u00f6rnekte, <code>useState(0)<\/code> Hook'u her zaman en \u00fcst seviyede \u00e7a\u011fr\u0131l\u0131r. <code>useEffect<\/code>'in i\u00e7indeki mant\u0131k ise <code>shouldShow<\/code> ko\u015fuluna ba\u011fl\u0131 olarak \u00e7al\u0131\u015f\u0131r. Bu, React'in Hook'lar\u0131n s\u0131ras\u0131n\u0131 tutarl\u0131 bir \u015fekilde takip etmesini sa\u011flar ve hatalar\u0131 \u00f6nler. Ayn\u0131 zamanda, <code>value<\/code> state'ine bile\u015fenin her yerinden eri\u015filebilir olmas\u0131 da bir avantajd\u0131r.<\/p>\n<p><strong>Vaka Analizi: Form Alanlar\u0131 \u0130\u00e7in \u00d6zel Hook Olu\u015fturma<\/strong><\/p>\n<p>Bir formdaki her giri\u015f alan\u0131 i\u00e7in state ve do\u011frulama mant\u0131\u011f\u0131 y\u00f6netti\u011finizi d\u00fc\u015f\u00fcn\u00fcn. Yanl\u0131\u015f bir yakla\u015f\u0131mla, her bir alan i\u00e7in d\u00f6ng\u00fc i\u00e7inde <code>useState<\/code> \u00e7a\u011f\u0131rabilirsiniz. Ancak do\u011fru yakla\u015f\u0131m, her bir form alan\u0131 i\u00e7in state ve mant\u0131\u011f\u0131 soyutlayan, bu kurallara uyan bir \u00f6zel Hook (\u00f6rne\u011fin, <code>useFormField<\/code>) olu\u015fturmakt\u0131r:<\/p>\n<div class=\"code-block-container\">\n<pre><code>\n\/\/ Do\u011fru \u00d6zel Hook \u00d6rne\u011fi: useFormField\nfunction useFormField(initialValue) {\n  const [value, setValue] = useState(initialValue);\n  const [error, setError] = useState(null);\n\n  const onChange = (e) => {\n    setValue(e.target.value);\n    \/\/ Do\u011frulama mant\u0131\u011f\u0131 buraya gelebilir\n    if (e.target.value.length < 3) {\n      setError('Minimum 3 karakter olmal\u0131.');\n    } else {\n      setError(null);\n    }\n  };\n\n  return { value, onChange, error };\n}\n\nfunction DogruForm() {\n  \/\/ Her alan i\u00e7in \u00f6zel Hook \u00e7a\u011fr\u0131s\u0131\n  const nameField = useFormField('');\n  const emailField = useFormField('');\n\n  const handleSubmit = (e) => {\n    e.preventDefault();\n    if (!nameField.error && !emailField.error) {\n      console.log('Form g\u00f6nderildi:', { name: nameField.value, email: emailField.value });\n    } else {\n      console.log('Formda hatalar var.');\n    }\n  };\n\n  return (\n    <form onSubmit={handleSubmit}>\n      <div>\n        <label>Ad:<\/label>\n        <input type=\"text\" value={nameField.value} onChange={nameField.onChange} \/>\n        {nameField.error && <p style={{ color: 'red' }}>{nameField.error}<\/p>}\n      <\/div>\n      <div>\n        <label>Email:<\/label>\n        <input type=\"email\" value={emailField.value} onChange={emailField.onChange} \/>\n        {emailField.error && <p style={{ color: 'red' }}>{emailField.error}<\/p>}\n      <\/div>\n      <button type=\"submit\">G\u00f6nder<\/button>\n    <\/form>\n  );\n}\n<\/pre>\n<p><\/code>\n<\/div>\n<p>Bu \u00f6rnekte, <code>useFormField<\/code> \u00f6zel Hook'u, her bir form alan\u0131 i\u00e7in state ve olay i\u015fleme mant\u0131\u011f\u0131n\u0131 kaps\u00fcller. <code>DogruForm<\/code> bile\u015feni i\u00e7inde bu \u00f6zel Hook'u her bir alan i\u00e7in ayr\u0131 ayr\u0131 \u00e7a\u011f\u0131rarak, Hooks kurallar\u0131na uymu\u015f oluruz ve kodumuzu hem temiz hem de yeniden kullan\u0131labilir hale getiririz.<\/p>\n<aside class=\"expert-tip\">\n  Uzman \u0130pucu: Hook'lar\u0131n kurallar\u0131na uymak zorunludur. React'in kendi ESLint eklentisi (<code>eslint-plugin-react-hooks<\/code>), bu kurallar\u0131 otomatik olarak kontrol etmenize ve potansiyel hatalar\u0131 geli\u015ftirme s\u0131ras\u0131nda yakalaman\u0131za yard\u0131mc\u0131 olur. Bu eklentiyi projenize dahil etmek, \u00e7ok say\u0131da yayg\u0131n Hook hatas\u0131ndan ka\u00e7\u0131nman\u0131z\u0131 sa\u011flar.<br \/>\n<\/aside>\n<h2>React Hooks ile Ustala\u015fmak \u0130\u00e7in Son \u0130pu\u00e7lar\u0131 ve S\u0131k\u00e7a Sorulan Sorular<\/h2>\n<p>React Hooks, React uygulamalar\u0131 geli\u015ftirme \u015feklimizi d\u00f6n\u00fc\u015ft\u00fcrd\u00fc. \u0130\u015flevsel bile\u015fenlere g\u00fc\u00e7 katan ve kodumuzu daha mod\u00fcler, yeniden kullan\u0131labilir hale getiren bu yap\u0131, do\u011fru anla\u015f\u0131ld\u0131\u011f\u0131nda ve uyguland\u0131\u011f\u0131nda geli\u015ftirici verimlili\u011fini \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131r\u0131r. Bu makale boyunca, ba\u015flang\u0131\u00e7 seviyesi geli\u015ftiricilerin en s\u0131k yapt\u0131\u011f\u0131 be\u015f yayg\u0131n hatay\u0131 inceledik: <code>useState<\/code> ile yanl\u0131\u015f state g\u00fcncellemeleri, <code>useEffect<\/code> ba\u011f\u0131ml\u0131l\u0131k dizisini do\u011fru y\u00f6netmeme, yan etkileri tek bir <code>useEffect<\/code>'te birle\u015ftirme, referans e\u015fitli\u011fini g\u00f6z ard\u0131 ederek gereksiz yeniden olu\u015fturmalara yol a\u00e7ma ve Hooks kurallar\u0131n\u0131 ihlal etme. Her bir hatay\u0131 kod \u00f6rnekleri ve vaka analizleriyle destekleyerek, bu tuzaklardan nas\u0131l ka\u00e7\u0131nabilece\u011finizi ve daha sa\u011flam uygulamalar geli\u015ftirebilece\u011finizi g\u00f6sterdik.<\/p>\n<p>Unutmamak gerekir ki, React Hooks'a hakim olmak zaman ve pratik gerektirir. Temel prensipleri \u2013 \u00f6zellikle React'in render d\u00f6ng\u00fcs\u00fc, immutability ve referans e\u015fitli\u011fi kavramlar\u0131n\u0131 \u2013 derinlemesine anlamak, Hooks'u etkin bir \u015fekilde kullanman\u0131n anahtar\u0131d\u0131r. Hatalar yapmak \u00f6\u011frenme s\u00fcrecinin do\u011fal bir par\u00e7as\u0131d\u0131r; \u00f6nemli olan, bu hatalardan ders \u00e7\u0131kararak ve en iyi uygulamalar\u0131 benimseyerek s\u00fcrekli geli\u015fmektir. Kodunuzu s\u00fcrekli olarak g\u00f6zden ge\u00e7irin, ba\u015fkalar\u0131n\u0131n kodlar\u0131n\u0131 inceleyin ve topluluk kaynaklar\u0131ndan faydalan\u0131n. Stack Overflow, React belgeleri ve \u00e7e\u015fitli bloglar, bilgi edinmek ve sorun gidermek i\u00e7in harika kaynaklard\u0131r. \u00d6zellikle React'in resmi belgelerindeki \"Rules of Hooks\" b\u00f6l\u00fcm\u00fcn\u00fc dikkatlice okuman\u0131z\u0131 tavsiye ederim.<\/p>\n<p>Ayr\u0131ca, <code>React.StrictMode<\/code>'u geli\u015ftirme ortam\u0131n\u0131zda kullanmak, Hooks ile ilgili potansiyel sorunlar\u0131 (\u00f6rne\u011fin, yan etkilerin \u00e7ift \u00e7al\u0131\u015fmas\u0131 gibi) erkenden yakalaman\u0131za yard\u0131mc\u0131 olabilir. Bu mod, bile\u015fenlerinizin beklenen davran\u0131\u015flar\u0131 sergiledi\u011finden emin olmak i\u00e7in ek kontroller yapar. ESLint eklentisi <code>eslint-plugin-react-hooks<\/code> ise Hooks kurallar\u0131na uydu\u011funuzdan emin olmak i\u00e7in vazge\u00e7ilmez bir ara\u00e7t\u0131r. Bu ara\u00e7lar\u0131 kullanarak, hatalar\u0131 otomatik olarak tespit edebilir ve kod kalitenizi art\u0131rabilirsiniz.<\/p>\n<p>\u015eimdi, React Hooks hakk\u0131nda s\u0131k\u00e7a sorulan baz\u0131 sorulara g\u00f6z atal\u0131m:<\/p>\n<h3>S\u0131k\u00e7a Sorulan Sorular<\/h3>\n<ol>\n<li>\n<h4>React Hooks'u ne zaman kullanmal\u0131y\u0131m?<\/h4>\n<p>React Hooks'u, React 16.8 ve \u00fczeri s\u00fcr\u00fcmlerde yeni fonksiyonel bile\u015fenler geli\u015ftirirken kullanmal\u0131s\u0131n\u0131z. State y\u00f6netimi, ya\u015fam d\u00f6ng\u00fcs\u00fc metodlar\u0131, context kullan\u0131m\u0131 veya di\u011fer geli\u015fmi\u015f React \u00f6zelliklerine ihtiyac\u0131n\u0131z oldu\u011funda, s\u0131n\u0131f bile\u015fenleri yerine Hooks'u tercih etmek, daha modern, temiz ve yeniden kullan\u0131labilir kod yazman\u0131z\u0131 sa\u011flar. Mevcut s\u0131n\u0131f bile\u015fenlerini tamamen Hooks'a ge\u00e7irmek zorunda de\u011filsiniz, ancak yeni geli\u015ftirme ve \u00f6zellik eklemeleri i\u00e7in Hooks'u kullanman\u0131z \u00f6nerilir.<\/p>\n<\/li>\n<li>\n<h4>Class component'lardan Hooks'a ge\u00e7meli miyim?<\/h4>\n<p>Mevcut ve \u00e7al\u0131\u015fan s\u0131n\u0131f bile\u015fenlerinizi hemen Hooks'a ge\u00e7irmek zorunlu de\u011fildir. React, s\u0131n\u0131f bile\u015fenlerini desteklemeye devam edecektir. Ancak, yeni \u00f6zellikler eklerken veya varolan s\u0131n\u0131f bile\u015fenlerinde \u00f6nemli de\u011fi\u015fiklikler yaparken, bunlar\u0131 Hooks'a d\u00f6n\u00fc\u015ft\u00fcrmeyi d\u00fc\u015f\u00fcnebilirsiniz. Bu ge\u00e7i\u015f, kod taban\u0131n\u0131z\u0131n modernle\u015fmesine, daha iyi test edilebilirli\u011fe ve daha kolay bak\u0131ma olanak tan\u0131r. Ge\u00e7i\u015f yaparken k\u00fc\u00e7\u00fck ad\u0131mlarla ilerlemek ve her bile\u015feni ayr\u0131 ayr\u0131 d\u00f6n\u00fc\u015ft\u00fcrmek en iyi yakla\u015f\u0131md\u0131r.<\/p>\n<\/li>\n<li>\n<h4><code>useRef<\/code> ve <code>useState<\/code> aras\u0131ndaki fark nedir?<\/h4>\n<p><code>useState<\/code>, bile\u015fenin yeniden render edilmesini tetikleyen ve UI'da g\u00f6r\u00fcnen veriyi y\u00f6netmek i\u00e7in kullan\u0131l\u0131r. State de\u011feri de\u011fi\u015fti\u011finde bile\u015fen yeniden render olur. \u00d6te yandan, <code>useRef<\/code>, referans de\u011ferini bile\u015fenin ya\u015fam d\u00f6ng\u00fcs\u00fc boyunca korur ve de\u011feri de\u011fi\u015fti\u011finde bile\u015fenin yeniden render edilmesini tetiklemez. Genellikle DOM elementlerine do\u011frudan eri\u015fmek, herhangi bir mutable de\u011feri bile\u015fen render'lar\u0131 aras\u0131nda tutmak (\u00f6rne\u011fin, bir zamanlay\u0131c\u0131 kimli\u011fi) veya bir kapan\u0131\u015f (closure) i\u00e7inde de\u011fi\u015fen bir de\u011feri yakalamak i\u00e7in kullan\u0131l\u0131r. K\u0131sacas\u0131, <code>useState<\/code> \"g\u00f6rsel\" state i\u00e7in, <code>useRef<\/code> ise \"kal\u0131c\u0131\" ve \"g\u00f6r\u00fcnmeyen\" referanslar i\u00e7in kullan\u0131l\u0131r.<\/p>\n<\/li>\n<li>\n<h4><code>useMemo<\/code> ve <code>useCallback<\/code> ne zaman gereklidir?<\/h4>\n<p><code>useMemo<\/code> ve <code>useCallback<\/code> performans optimizasyonu ara\u00e7lar\u0131d\u0131r ve sadece \u00f6l\u00e7\u00fclebilir performans sorunlar\u0131 ya\u015fad\u0131\u011f\u0131n\u0131zda veya gereksiz yeniden render'lar\u0131 \u00f6nlemeniz gerekti\u011finde kullan\u0131lmal\u0131d\u0131r. <code>useCallback<\/code>, bir fonksiyonun referans\u0131n\u0131n ayn\u0131 kalmas\u0131n\u0131 sa\u011flarken, <code>useMemo<\/code>, bir de\u011ferin (nesne, dizi veya pahal\u0131 bir hesaplama sonucu) referans\u0131n\u0131n ayn\u0131 kalmas\u0131n\u0131 sa\u011flar. Bu Hook'lar \u00f6zellikle alt bile\u015fenlere prop olarak nesne veya fonksiyon ge\u00e7irdi\u011finizde ve bu alt bile\u015fenlerin <code>React.memo<\/code> ile optimize edildi\u011fi durumlarda faydal\u0131d\u0131r. K\u00fc\u00e7\u00fck uygulamalarda veya performans sorunu olmayan yerlerde a\u015f\u0131r\u0131 kullan\u0131mlar\u0131, Hook'lar\u0131n kendilerinin getirdi\u011fi ek karma\u015f\u0131kl\u0131k nedeniyle ters etki yapabilir.<\/p>\n<\/li>\n<li>\n<h4><code>React.StrictMode<\/code> neden \u00f6nemlidir?<\/h4>\n<p><code>React.StrictMode<\/code>, geli\u015ftirme ortam\u0131nda potansiyel sorunlar\u0131 (\u00f6rne\u011fin, yan etkilere neden olan hatal\u0131 kod, eski API kullan\u0131mlar\u0131 veya beklenmeyen ya\u015fam d\u00f6ng\u00fcs\u00fc davran\u0131\u015flar\u0131) belirlemeye yard\u0131mc\u0131 olan bir ara\u00e7t\u0131r. Uygulaman\u0131zda herhangi bir g\u00f6rsel de\u011fi\u015fiklik yapmaz, ancak bile\u015fenleriniz i\u00e7indeki belirli fonksiyonlar\u0131 iki kez \u00e7al\u0131\u015ft\u0131rarak veya belirli uyar\u0131lar\u0131 g\u00f6stererek sizi olas\u0131 problemlere kar\u015f\u0131 uyar\u0131r. \u00d6rne\u011fin, <code>useEffect<\/code> i\u00e7indeki temizleme fonksiyonlar\u0131n\u0131n do\u011fru \u00e7al\u0131\u015ft\u0131\u011f\u0131ndan emin olmak i\u00e7in effect'lerinizi iki kez tetikleyebilir. Bu, hatalar\u0131 erkenden yakalamak ve daha sa\u011flam bir uygulama geli\u015ftirmek i\u00e7in kritik \u00f6neme sahiptir.<\/p>\n<\/li>\n<\/ol>\n<\/div>\n","protected":false},"excerpt":{"rendered":"React Hooks ile Ba\u015flang\u0131\u00e7 Hatalar\u0131: Kapsaml\u0131 Rehber React Hooks, fonksiyonel bile\u015fenlerde state ve ya\u015fam d\u00f6ng\u00fcs\u00fc \u00f6zelliklerini kullanmam\u0131z\u0131 sa\u011flayarak&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":[128],"tags":[],"class_list":{"0":"post-32841","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-react","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 Hooks ile Tan\u0131\u015f\u0131n: Neden Hatalar Yap\u0131yoruz ve Nas\u0131l Ka\u00e7\u0131n\u0131r\u0131z?<\/title>\n<meta name=\"description\" content=\"React Hooks, fonksiyonel bile\u015fenlerde state ve ya\u015fam d\u00f6ng\u00fcs\u00fc \u00f6zelliklerini kullanmam\u0131z\u0131 sa\u011flayarak React geli\u015ftirme deneyimini k\u00f6kten de\u011fi\u015ftirdi. 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