{"id":38000,"date":"2026-01-21T07:00:44","date_gmt":"2026-01-21T04:00:44","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/javascriptin-gizli-yasami-cop-toplayici\/"},"modified":"2026-01-21T07:00:44","modified_gmt":"2026-01-21T04:00:44","slug":"javascriptin-gizli-yasami-cop-toplayici","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/javascriptin-gizli-yasami-cop-toplayici\/","title":{"rendered":"JavaScript’in Gizli Ya\u015fam\u0131: \u00c7\u00f6p Toplay\u0131c\u0131"},"content":{"rendered":"

JavaScript’in Gizli Ya\u015fam\u0131: \u00c7\u00f6p Toplay\u0131c\u0131<\/h2>\n

JavaScript, modern web uygulamalar\u0131n\u0131n ve \u00f6tesinin temel ta\u015f\u0131d\u0131r. Geli\u015ftiricilere b\u00fcy\u00fck bir esneklik sunarken, arka planda \u00e7al\u0131\u015fan ve \u00e7o\u011fu zaman g\u00f6zden ka\u00e7an kritik bir bile\u015feni vard\u0131r: \u00c7\u00f6p Toplay\u0131c\u0131 (Garbage Collector). Bu g\u00f6r\u00fcnmez kahraman, uygulamalar\u0131m\u0131z\u0131n bellek y\u00f6netimini otomatikle\u015ftirerek performansl\u0131 ve kararl\u0131 \u00e7al\u0131\u015fmas\u0131n\u0131 sa\u011flar. Bu makalede, JavaScript’in bellek y\u00f6netiminin derinliklerine inecek, \u00e7\u00f6p toplay\u0131c\u0131n\u0131n nas\u0131l \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131, kulland\u0131\u011f\u0131 algoritmalar\u0131 ve performans \u00fczerindeki etkilerini detayl\u0131 bir \u015fekilde inceleyece\u011fiz.<\/p>\n

Bellek Y\u00f6netimi ve JavaScript: Bir Giri\u015f<\/h3>\n

JavaScript, C++ veya Rust gibi dillerin aksine, geli\u015ftiricinin manuel olarak bellek tahsis etme veya serbest b\u0131rakma sorumlulu\u011funu \u00fcstlenmedi\u011fi, “y\u00f6netilen” bir dildir. Bu, geli\u015ftiricilerin bellek s\u0131z\u0131nt\u0131lar\u0131 ve segmentasyon hatalar\u0131 gibi karma\u015f\u0131k sorunlarla daha az u\u011fra\u015fmas\u0131n\u0131 sa\u011flar, ancak bu sorumlulu\u011fu \u00fcstlenen bir mekanizma olmas\u0131 gerekir: \u00c7\u00f6p Toplay\u0131c\u0131.<\/p>\n

Bellek Y\u00f6netimi Neden \u00d6nemli?<\/h4>\n

Bellek y\u00f6netimi, herhangi bir yaz\u0131l\u0131m uygulamas\u0131n\u0131n verimli ve kararl\u0131 \u00e7al\u0131\u015fmas\u0131 i\u00e7in hayati \u00f6neme sahiptir. Yetersiz bellek y\u00f6netimi, uygulaman\u0131n yava\u015flamas\u0131na, \u00e7\u00f6kmesine veya uzun vadede karars\u0131z hale gelmesine neden olabilir. Modern web uygulamalar\u0131, karma\u015f\u0131k kullan\u0131c\u0131 aray\u00fczleri ve yo\u011fun veri i\u015fleme s\u00fcre\u00e7leri ile \u00e7al\u0131\u015ft\u0131\u011f\u0131ndan, bellek kullan\u0131m\u0131 kritik bir performans fakt\u00f6r\u00fcd\u00fcr.<\/p>\n

JavaScript ve Otomatik Bellek Y\u00f6netimi<\/h4>\n

JavaScript motorlar\u0131 (\u00f6rne\u011fin V8, SpiderMonkey), bellek y\u00f6netimini otomatik olarak halleder. Bir de\u011fi\u015fken veya nesne olu\u015fturdu\u011funuzda, motor otomatik olarak bellekte yer ay\u0131r\u0131r. Bu nesneye art\u0131k ihtiya\u00e7 kalmad\u0131\u011f\u0131nda veya eri\u015filemez hale geldi\u011finde, \u00e7\u00f6p toplay\u0131c\u0131 devreye girer ve bu belle\u011fi serbest b\u0131rakarak di\u011fer kullan\u0131mlar i\u00e7in haz\u0131r hale getirir. Bu otomasyon, geli\u015ftiricilere daha h\u0131zl\u0131 \u00fcr\u00fcn geli\u015ftirme ve daha az hata yapma imkan\u0131 sunar.<\/p>\n

\u00c7\u00f6p Toplay\u0131c\u0131 Nedir ve Nas\u0131l \u00c7al\u0131\u015f\u0131r?<\/h3>\n

\u00c7\u00f6p toplay\u0131c\u0131, JavaScript motorunun bir par\u00e7as\u0131d\u0131r ve bellekte art\u0131k kullan\u0131lmayan veya eri\u015filemeyen nesneleri tespit edip temizlemekle g\u00f6revlidir. Temel amac\u0131, uygulaman\u0131n bellek t\u00fcketimini optimize etmek ve bellek s\u0131z\u0131nt\u0131lar\u0131n\u0131 \u00f6nlemektir.<\/p>\n

\u00c7\u00f6p Toplay\u0131c\u0131n\u0131n Temel G\u00f6revi<\/h4>\n

\u00c7\u00f6p toplay\u0131c\u0131n\u0131n ana g\u00f6revi, uygulaman\u0131z\u0131n belle\u011finde “\u00e7\u00f6p” olarak tan\u0131mlanan verileri bulmakt\u0131r. \u00c7\u00f6p, art\u0131k program\u0131n\u0131z\u0131n herhangi bir b\u00f6l\u00fcm\u00fcnden eri\u015filemeyen veya kullan\u0131lamayan nesnelerdir. \u00d6rne\u011fin, bir fonksiyonun i\u00e7inde olu\u015fturulmu\u015f yerel bir de\u011fi\u015fken, fonksiyonun y\u00fcr\u00fct\u00fclmesi bitti\u011finde genellikle \u00e7\u00f6p haline gelir.<\/p>\n

Eri\u015filebilirlik Kavram\u0131<\/h4>\n

\u00c7\u00f6p toplay\u0131c\u0131, bir nesnenin \u00e7\u00f6p olup olmad\u0131\u011f\u0131n\u0131 belirlemek i\u00e7in “eri\u015filebilirlik” kavram\u0131n\u0131 kullan\u0131r. Bir nesneye eri\u015filebilir demek, uygulaman\u0131z\u0131n “k\u00f6k” (root) olarak adland\u0131r\u0131lan bir dizi ba\u015flang\u0131\u00e7 noktas\u0131ndan (\u00f6rne\u011fin, global de\u011fi\u015fkenler, mevcut fonksiyon \u00e7a\u011fr\u0131 y\u0131\u011f\u0131ndaki de\u011fi\u015fkenler) do\u011frudan veya dolayl\u0131 olarak ula\u015f\u0131labiliyor olmas\u0131 demektir. E\u011fer bir nesneye bu k\u00f6klerden hi\u00e7bir \u015fekilde ula\u015f\u0131lam\u0131yorsa, o nesne \u00e7\u00f6p olarak kabul edilir ve temizlenebilir.<\/p>\n

\u00d6rnek:<\/p>\n

let a = { name: \"Object A\" }; \/\/ 'a' global bir referans, eri\u015filebilir\nlet b = { name: \"Object B\" }; \/\/ 'b' global bir referans, eri\u015filebilir\n\na = b; \/\/ \u015eimdi 'a' ve 'b' ayn\u0131 nesneye referans veriyor.\n       \/\/ Eski { name: \"Object A\" } nesnesine art\u0131k hi\u00e7bir yerden eri\u015filemiyor.\n       \/\/ Bu nesne art\u0131k \u00e7\u00f6p haline geldi.\n\nb = null; \/\/ \u015eimdi 'b' de null'a ayarland\u0131.\n          \/\/ { name: \"Object B\" } nesnesine art\u0131k hi\u00e7bir yerden eri\u015filemiyor.\n          \/\/ Bu nesne de art\u0131k \u00e7\u00f6p haline geldi.\n<\/pre>\n
<\/code><\/p>\n
\u00c7\u00f6p Toplama S\u00fcrecinin A\u015famalar\u0131<\/h4>\n
\u00c7\u00f6p toplama s\u00fcreci genellikle iki ana a\u015famadan olu\u015fur, ancak baz\u0131 motorlar ek a\u015famalar da kullan\u0131r:<\/p>\n
    \n
  1. \u0130\u015faretleme (Marking):<\/strong> \u00c7\u00f6p toplay\u0131c\u0131, k\u00f6klerden ba\u015flayarak t\u00fcm eri\u015filebilir nesneleri i\u015faretler. Bu, genellikle bir a\u011fa\u00e7 ge\u00e7i\u015fi (tree traversal) algoritmas\u0131yla yap\u0131l\u0131r.<\/li>\n
  2. S\u00fcp\u00fcrme (Sweeping):<\/strong> \u0130\u015faretlenmemi\u015f t\u00fcm nesneler (yani eri\u015filemeyenler) bellekten silinir.<\/li>\n
  3. S\u0131k\u0131\u015ft\u0131rma (Compacting - Opsiyonel):<\/strong> Baz\u0131 \u00e7\u00f6p toplay\u0131c\u0131lar, bellek par\u00e7alanmas\u0131n\u0131 (fragmentation) azaltmak ve bo\u015f bellek alanlar\u0131n\u0131 bir araya getirmek i\u00e7in s\u00fcp\u00fcrme i\u015fleminden sonra kalan eri\u015filebilir nesneleri bir araya getirir. Bu, daha b\u00fcy\u00fck biti\u015fik bellek bloklar\u0131n\u0131n tahsis edilmesini kolayla\u015ft\u0131r\u0131r.<\/li>\n<\/ol>\n
    Temel \u00c7\u00f6p Toplama Algoritmalar\u0131<\/h3>\n
    JavaScript motorlar\u0131, \u00e7\u00f6p toplamay\u0131 ger\u00e7ekle\u015ftirmek i\u00e7in \u00e7e\u015fitli algoritmalar kullan\u0131r. En yayg\u0131n olanlar\u0131 Referans Sayma ve \u0130\u015faretle ve S\u00fcp\u00fcr algoritmalar\u0131d\u0131r.<\/p>\n
    Referans Sayma (Reference Counting)<\/h4>\n
    Bu algoritma, her nesnenin ka\u00e7 referans\u0131 oldu\u011funu takip eder. Bir nesneye yeni bir referans atand\u0131\u011f\u0131nda sayac\u0131 art\u0131r\u0131l\u0131r, bir referans kald\u0131r\u0131ld\u0131\u011f\u0131nda (\u00f6rne\u011fin, de\u011fi\u015fken null'a ayarland\u0131\u011f\u0131nda veya kapsam d\u0131\u015f\u0131na \u00e7\u0131kt\u0131\u011f\u0131nda) sayac\u0131 azalt\u0131l\u0131r. E\u011fer bir nesnenin referans sayac\u0131 s\u0131f\u0131ra d\u00fc\u015ferse, bu nesneye art\u0131k eri\u015filemedi\u011fi varsay\u0131l\u0131r ve bellekten silinir.<\/p>\n
      \n
    • Avantajlar\u0131:<\/strong> Basit bir algoritmad\u0131r ve \u00e7\u00f6p toplama i\u015flemleri, referanslar azald\u0131k\u00e7a k\u00fc\u00e7\u00fck par\u00e7alar halinde ger\u00e7ekle\u015fir, bu da uygulaman\u0131n uzun duraklamalar ya\u015famas\u0131n\u0131 engeller.<\/li>\n
    • Dezavantajlar\u0131:<\/strong> En b\u00fcy\u00fck dezavantaj\u0131, d\u00f6ng\u00fcsel referanslar\u0131 (circular references)<\/strong> tespit edememesidir. \u0130ki veya daha fazla nesne birbirine referans veriyorsa, ancak bu nesnelere d\u0131\u015far\u0131dan hi\u00e7bir referans kalmam\u0131\u015fsa, referans saya\u00e7lar\u0131 hi\u00e7bir zaman s\u0131f\u0131ra d\u00fc\u015fmeyecek ve bellek s\u0131z\u0131nt\u0131s\u0131na neden olacakt\u0131r.<\/li>\n<\/ul>\n
      D\u00f6ng\u00fcsel Referans \u00d6rne\u011fi:<\/strong><\/p>\n
      function problematikDurum() {\n  let obj1 = {};\n  let obj2 = {};\n\n  obj1.a = obj2; \/\/ obj1, obj2'ye referans veriyor\n  obj2.a = obj1; \/\/ obj2, obj1'e referans veriyor\n\n  \/\/ Fonksiyon bitti\u011finde, obj1 ve obj2'ye d\u0131\u015far\u0131dan eri\u015fim kalmaz.\n  \/\/ Referans Sayma algoritmas\u0131 bu nesnelerin saya\u00e7lar\u0131n\u0131 asla s\u0131f\u0131ra indiremez.\n  \/\/ Bellek s\u0131z\u0131nt\u0131s\u0131 olu\u015fur.\n}\nproblematikDurum();\n<\/pre>\n
      <\/code><\/p>\n
      Modern JavaScript motorlar\u0131, bu d\u00f6ng\u00fcsel referans sorunundan dolay\u0131 genellikle sadece Referans Sayma algoritmas\u0131n\u0131 kullanmazlar.<\/p>\n
      \u0130\u015faretle ve S\u00fcp\u00fcr (Mark and Sweep)<\/h4>\n
      Bu algoritma, Referans Sayma'n\u0131n d\u00f6ng\u00fcsel referans sorununu \u00e7\u00f6zer ve modern JavaScript motorlar\u0131nda en yayg\u0131n kullan\u0131lan temel \u00e7\u00f6p toplama algoritmas\u0131d\u0131r. \u0130ki ana a\u015famadan olu\u015fur:<\/p>\n
        \n
      1. \u0130\u015faretleme (Mark):<\/strong> \u00c7\u00f6p toplay\u0131c\u0131, \"k\u00f6k\" olarak kabul edilen global nesnelerden (\u00f6rne\u011fin window<\/code> objesi, aktif fonksiyon \u00e7a\u011fr\u0131 y\u0131\u011f\u0131n\u0131) ba\u015flayarak, bu k\u00f6klerden do\u011frudan veya dolayl\u0131 olarak eri\u015filebilen t\u00fcm nesneleri i\u015faretler. Bu i\u015flem, bir a\u011fa\u00e7 veya grafik ge\u00e7i\u015fi gibi \u00e7al\u0131\u015f\u0131r.<\/li>\n
      2. S\u00fcp\u00fcrme (Sweep):<\/strong> \u0130\u015faretleme a\u015famas\u0131 tamamland\u0131ktan sonra, \u00e7\u00f6p toplay\u0131c\u0131 bellekteki t\u00fcm nesneler aras\u0131nda gezinir. \u0130\u015faretlenmemi\u015f olan t\u00fcm nesneler, art\u0131k eri\u015filemez olduklar\u0131 i\u00e7in bellekten silinir.<\/li>\n<\/ol>\n
          \n
        • Avantajlar\u0131:<\/strong> D\u00f6ng\u00fcsel referanslar\u0131 do\u011fru bir \u015fekilde tespit edip temizleyebilir.<\/li>\n
        • Dezavantajlar\u0131:<\/strong> Bu i\u015flem s\u0131ras\u0131nda uygulaman\u0131n y\u00fcr\u00fct\u00fclmesi durdurulur (bu duruma \"stop-the-world\" pause denir). B\u00fcy\u00fck bellek y\u0131\u011f\u0131nlar\u0131nda bu duraklamalar fark edilebilir gecikmelere neden olabilir. Ayr\u0131ca, bellekten silinen nesneler rastgele da\u011f\u0131ld\u0131\u011f\u0131 i\u00e7in bellek par\u00e7alanmas\u0131na yol a\u00e7abilir.<\/li>\n<\/ul>\n
          \u0130\u015faretle ve S\u0131k\u0131\u015ft\u0131r (Mark and Compact)<\/h4>\n
          \u0130\u015faretle ve S\u00fcp\u00fcr algoritmas\u0131n\u0131n bir varyant\u0131d\u0131r. S\u00fcp\u00fcrme a\u015famas\u0131ndan sonra, bellekteki bo\u015fluklar\u0131 doldurmak ve biti\u015fik bo\u015f alanlar olu\u015fturmak i\u00e7in eri\u015filebilir nesneleri belle\u011fin bir ucuna ta\u015f\u0131r. Bu, daha b\u00fcy\u00fck nesneler i\u00e7in biti\u015fik bellek tahsisini kolayla\u015ft\u0131r\u0131r ve bellek par\u00e7alanmas\u0131n\u0131 azalt\u0131r.<\/p>\n
          Geli\u015fmi\u015f \u00c7\u00f6p Toplama Teknikleri<\/h3>\n
          Modern JavaScript motorlar\u0131, \u0130\u015faretle ve S\u00fcp\u00fcr'\u00fcn dezavantajlar\u0131n\u0131 gidermek ve performans\u0131 art\u0131rmak i\u00e7in daha geli\u015fmi\u015f teknikler kullan\u0131r.<\/p>\n
          Nesilsel \u00c7\u00f6p Toplama (Generational Garbage Collection)<\/h4>\n
          Bu teknik, nesnelerin ya\u015flar\u0131na g\u00f6re farkl\u0131 \"nesillere\" ayr\u0131lmas\u0131 prensibine dayan\u0131r. Temel varsay\u0131m, \u00e7o\u011fu nesnenin ya \u00e7ok gen\u00e7 ya\u015fta \u00f6ld\u00fc\u011f\u00fc (k\u0131sa \u00f6m\u00fcrl\u00fc oldu\u011fu) ya da uzun s\u00fcre ya\u015fad\u0131\u011f\u0131d\u0131r. Bu varsay\u0131ma g\u00f6re bellek iki ana b\u00f6l\u00fcme ayr\u0131l\u0131r:<\/p>\n
            \n
          • Gen\u00e7 Nesil (Young Generation \/ Nursery):<\/strong> Yeni olu\u015fturulan nesneler bu b\u00f6l\u00fcme yerle\u015ftirilir. Bu b\u00f6lge daha s\u0131k ve daha h\u0131zl\u0131 taran\u0131r \u00e7\u00fcnk\u00fc \u00e7o\u011fu nesnenin burada \u00e7\u00f6p olaca\u011f\u0131 varsay\u0131l\u0131r.<\/li>\n
          • Ya\u015fl\u0131 Nesil (Old Generation):<\/strong> Gen\u00e7 nesilde birden fazla \u00e7\u00f6p toplama d\u00f6ng\u00fcs\u00fcnden sa\u011f \u00e7\u0131kan nesneler, ya\u015fl\u0131 nesile ta\u015f\u0131n\u0131r (promoted). Bu b\u00f6lge daha az s\u0131kl\u0131kta taran\u0131r \u00e7\u00fcnk\u00fc buradaki nesnelerin daha uzun \u00f6m\u00fcrl\u00fc oldu\u011fu varsay\u0131l\u0131r.<\/li>\n<\/ul>\n
            Bu yakla\u015f\u0131m, \u00e7\u00f6p toplama duraklamalar\u0131n\u0131n s\u00fcresini k\u0131salt\u0131r \u00e7\u00fcnk\u00fc her seferinde t\u00fcm belle\u011fi taramak yerine, sadece gen\u00e7 nesil taran\u0131r.<\/p>\n
            Art\u0131ml\u0131 ve E\u015fzamanl\u0131 \u00c7\u00f6p Toplama (Incremental & Concurrent GC)<\/h4>\n
            \"Stop-the-world\" duraklamalar\u0131n\u0131 daha da azaltmak i\u00e7in geli\u015ftirilen bu teknikler, \u00e7\u00f6p toplama i\u015flemini uygulaman\u0131n ana i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131 uzun s\u00fcre bloke etmeden ger\u00e7ekle\u015ftirir:<\/p>\n
              \n
            • Art\u0131ml\u0131 (Incremental) GC:<\/strong> \u00c7\u00f6p toplama i\u015flemini k\u00fc\u00e7\u00fck par\u00e7alara b\u00f6ler. Her par\u00e7an\u0131n ard\u0131ndan uygulaman\u0131n y\u00fcr\u00fct\u00fclmesine geri d\u00f6n\u00fcl\u00fcr. Bu, kullan\u0131c\u0131 aray\u00fcz\u00fcn\u00fcn donmas\u0131n\u0131 engeller, ancak toplam \u00e7\u00f6p toplama s\u00fcresi biraz artabilir.<\/li>\n
            • E\u015fzamanl\u0131 (Concurrent) GC:<\/strong> \u00c7\u00f6p toplama i\u015fleminin bir k\u0131sm\u0131n\u0131 veya tamam\u0131n\u0131 ayr\u0131 bir i\u015f par\u00e7ac\u0131\u011f\u0131nda (thread) uygulaman\u0131n ana i\u015f par\u00e7ac\u0131\u011f\u0131yla e\u015fzamanl\u0131 olarak \u00e7al\u0131\u015ft\u0131r\u0131r. Bu, ana i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131n daha az kesintiye u\u011framas\u0131n\u0131 sa\u011flar ve duraklamalar\u0131 minimuma indirir.<\/li>\n<\/ul>\n
              V8 motoru (Chrome ve Node.js taraf\u0131ndan kullan\u0131l\u0131r), bu geli\u015fmi\u015f teknikleri (\u00f6rne\u011fin Orinoco) kullanarak \u00e7ok k\u0131sa duraklamalarla y\u00fcksek performansl\u0131 \u00e7\u00f6p toplama sa\u011flar.<\/p>\n
              Tembel S\u00fcp\u00fcrme (Lazy Sweeping)<\/h4>\n
              S\u00fcp\u00fcrme a\u015famas\u0131n\u0131n hemen tamam\u0131n\u0131 tek seferde yapmak yerine, bellekteki bo\u015f alanlar\u0131 ger\u00e7ekten ihtiya\u00e7 duyulana kadar temizlemeyi erteleme tekni\u011fidir. Bu, uygulaman\u0131n ana i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131n daha h\u0131zl\u0131 tepki vermesini sa\u011flar.<\/p>\n
              Performans \u0130pu\u00e7lar\u0131 ve En \u0130yi Uygulamalar<\/h3>\n
              \u00c7\u00f6p toplay\u0131c\u0131 \u00e7o\u011fu zaman otomatik \u00e7al\u0131\u015fsa da, bilin\u00e7li kod yazmak uygulaman\u0131z\u0131n performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde etkileyebilir.<\/p>\n
              Gereksiz Referanslardan Ka\u00e7\u0131nma<\/h4>\n
              Art\u0131k kullan\u0131lmayacak nesnelere olan referanslar\u0131 temizlemek, \u00e7\u00f6p toplay\u0131c\u0131n\u0131n i\u015fini kolayla\u015ft\u0131r\u0131r. \u00d6zellikle b\u00fcy\u00fck veri yap\u0131lar\u0131 veya DOM elemanlar\u0131 s\u00f6z konusu oldu\u011funda, referanslar\u0131 null<\/code> olarak ayarlamak faydal\u0131 olabilir.<\/p>\n
              let buyukDizi = new Array(1000000).fill(0);\n\/\/ ... buyukDizi ile i\u015flemler ...\n\n\/\/ Art\u0131k gerek kalmad\u0131\u011f\u0131nda referans\u0131 temizle\nbuyukDizi = null; \/\/ Bu, dizinin \u00e7\u00f6p toplay\u0131c\u0131 taraf\u0131ndan temizlenmesine yard\u0131mc\u0131 olur.\n<\/pre>\n
              <\/code><\/p>\n
              B\u00fcy\u00fck Nesneler ve \u00d6nbellekleme<\/h4>\n
              S\u0131k s\u0131k b\u00fcy\u00fck nesneler olu\u015fturup yok etmek yerine, bu nesneleri yeniden kullanmaya veya \u00f6nbelle\u011fe almaya \u00e7al\u0131\u015f\u0131n. Nesne havuzlar\u0131 (object pooling) gibi desenler, \u00e7\u00f6p toplama maliyetini azaltabilir.<\/p>\n
              Kapan\u0131\u015flar\u0131n (Closures) Dikkatli Kullan\u0131m\u0131<\/h4>\n
              Kapan\u0131\u015flar, d\u0131\u015f kapsamdaki de\u011fi\u015fkenlere referans tutar. E\u011fer bir kapan\u0131\u015f, b\u00fcy\u00fck bir d\u0131\u015f kapsamdaki de\u011fi\u015fkenlere referans veriyorsa ve bu kapan\u0131\u015f uzun s\u00fcre ya\u015f\u0131yorsa, d\u0131\u015f kapsamdaki de\u011fi\u015fkenlerin de bellekten temizlenmesini engelleyebilir. Bellek s\u0131z\u0131nt\u0131lar\u0131na yol a\u00e7mamak i\u00e7in kapan\u0131\u015flar\u0131n referanslar\u0131n\u0131 dikkatlice y\u00f6netin.<\/p>\n
              function buyukKapsamYarat() {\n  let buyukVeri = new Array(100000);\n  return function() {\n    \/\/ Bu kapan\u0131\u015f, buyukVeri'ye referans tutar.\n    \/\/ Kapan\u0131\u015f ya\u015fad\u0131\u011f\u0131 s\u00fcrece buyukVeri de temizlenemez.\n    console.log(buyukVeri.length);\n  };\n}\n\nlet benimKapanisim = buyukKapsamYarat();\n\/\/ benimKapanisim \u00e7al\u0131\u015ft\u0131\u011f\u0131 s\u00fcrece buyukVeri bellekte kal\u0131r.\n\/\/ E\u011fer benimKapanisim'i art\u0131k kullanm\u0131yorsan\u0131z:\n\/\/ benimKapanisim = null;\n<\/pre>\n
              <\/code><\/p>\n
              Web Workers ve Bellek \u0130zolasyonu<\/h4>\n
              Yo\u011fun hesaplama veya b\u00fcy\u00fck veri i\u015fleme i\u015flemleri i\u00e7in Web Workers kullanmak, ana i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131n bellek kullan\u0131m\u0131n\u0131 izole eder ve \u00e7\u00f6p toplama duraklamalar\u0131n\u0131n ana kullan\u0131c\u0131 aray\u00fcz\u00fcn\u00fc etkilemesini engeller.<\/p>\n
              Performans Profili Olu\u015fturma Ara\u00e7lar\u0131<\/h4>\n
              Taray\u0131c\u0131lar\u0131n geli\u015ftirici ara\u00e7lar\u0131 (\u00f6rne\u011fin Chrome DevTools'daki \"Memory\" sekmesi), uygulaman\u0131z\u0131n bellek kullan\u0131m\u0131n\u0131 izlemenize ve potansiyel bellek s\u0131z\u0131nt\u0131lar\u0131n\u0131 veya yo\u011fun \u00e7\u00f6p toplama aktivitelerini tespit etmenize olanak tan\u0131r. Heap Snapshot'lar\u0131 almak ve bellek kullan\u0131m grafiklerini incelemek, sorunlar\u0131 te\u015fhis etmede \u00e7ok yard\u0131mc\u0131d\u0131r.<\/p>\n
              \u00c7\u00f6p Toplay\u0131c\u0131n\u0131n Uygulama Performans\u0131na Etkisi<\/h3>\n
              \u00c7\u00f6p toplay\u0131c\u0131, uygulamalar\u0131n kararl\u0131 \u00e7al\u0131\u015fmas\u0131n\u0131 sa\u011flarken, ayn\u0131 zamanda performans \u00fczerinde de do\u011frudan bir etkiye sahiptir.<\/p>\n
              Duraklamalar (Pauses) ve Kullan\u0131c\u0131 Deneyimi<\/h4>\n
              \u00c7\u00f6p toplay\u0131c\u0131 \u00e7al\u0131\u015f\u0131rken, uygulaman\u0131n ana i\u015f par\u00e7ac\u0131\u011f\u0131 k\u0131sa bir s\u00fcre durabilir. Bu \"stop-the-world\" duraklamalar\u0131, \u00f6zellikle eski veya basit GC algoritmalar\u0131nda belirgin olabilir ve uygulaman\u0131n donmas\u0131na, kullan\u0131c\u0131 aray\u00fcz\u00fcn\u00fcn tepkisiz kalmas\u0131na neden olarak k\u00f6t\u00fc bir kullan\u0131c\u0131 deneyimi yaratabilir. Modern GC algoritmalar\u0131 bu duraklamalar\u0131 milisaniyeler seviyesine indirse de, yine de fark edilebilir olabilir.<\/p>\n
              Bellek S\u0131z\u0131nt\u0131lar\u0131 ve GC<\/h4>\n
              Bellek s\u0131z\u0131nt\u0131s\u0131, art\u0131k ihtiya\u00e7 duyulmayan ancak \u00e7\u00f6p toplay\u0131c\u0131 taraf\u0131ndan temizlenemeyen bellek alanlar\u0131n\u0131n birikmesidir. Bu genellikle, bir nesneye gereksiz yere referans tutulmas\u0131 (\u00f6rne\u011fin, DOM elemanlar\u0131na event listener ekleyip kald\u0131rmay\u0131 unutmak veya kapan\u0131\u015flar\u0131n d\u0131\u015f kapsamdaki b\u00fcy\u00fck nesneleri tutmas\u0131) nedeniyle olur. \u00c7\u00f6p toplay\u0131c\u0131 ne kadar geli\u015fmi\u015f olursa olsun, e\u011fer bir nesneye hala eri\u015filebilir bir referans varsa, onu \u00e7\u00f6p olarak alg\u0131lay\u0131p temizleyemez.<\/p>\n
              Modern JavaScript Motorlar\u0131 ve GC<\/h4>\n
              V8 (Google Chrome, Node.js), SpiderMonkey (Firefox) ve JavaScriptCore (Safari) gibi modern JavaScript motorlar\u0131, \u00e7\u00f6p toplama algoritmalar\u0131n\u0131 s\u00fcrekli olarak geli\u015ftirmektedir. Bu motorlar, nesilsel \u00e7\u00f6p toplama, art\u0131ml\u0131 ve e\u015fzamanl\u0131 toplama gibi karma\u015f\u0131k stratejileri bir araya getirerek duraklamalar\u0131 en aza indirir ve genel performans\u0131 art\u0131r\u0131r. Geli\u015ftiricilerin bu motorlar\u0131n \u00e7al\u0131\u015fma prensiplerini anlamas\u0131, daha optimize kod yazmalar\u0131na yard\u0131mc\u0131 olur.<\/p>\n
              Sonu\u00e7<\/h3>\n
              JavaScript'in \u00e7\u00f6p toplay\u0131c\u0131s\u0131, \u00e7o\u011fu zaman g\u00f6r\u00fcnmez bir kahraman gibi \u00e7al\u0131\u015f\u0131r, bellek y\u00f6netiminin karma\u015f\u0131kl\u0131\u011f\u0131n\u0131 geli\u015ftiriciden uzak tutar. Referans Sayma'dan \u0130\u015faretle ve S\u00fcp\u00fcr'e, oradan da nesilsel ve e\u015fzamanl\u0131 toplama gibi geli\u015fmi\u015f tekniklere uzanan evrimi, JavaScript uygulamalar\u0131n\u0131n daha h\u0131zl\u0131 ve daha kararl\u0131 hale gelmesini sa\u011flam\u0131\u015ft\u0131r. Bir geli\u015ftirici olarak, \u00e7\u00f6p toplay\u0131c\u0131n\u0131n nas\u0131l \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 anlamak, bellek s\u0131z\u0131nt\u0131lar\u0131n\u0131 \u00f6nlemenize, uygulaman\u0131z\u0131n performans\u0131n\u0131 optimize etmenize ve daha sa\u011flam kod yazman\u0131za yard\u0131mc\u0131 olacakt\u0131r. Bu gizli ya\u015fam\u0131 anlamak, JavaScript ekosisteminde daha yetkin bir geli\u015ftirici olman\u0131n anahtarlar\u0131ndan biridir.<\/p>\n
              SSS (S\u0131k Sorulan Sorular)<\/h3>\n
              JavaScript'te bellek s\u0131z\u0131nt\u0131s\u0131 nedir?<\/h4>\n
              Bellek s\u0131z\u0131nt\u0131s\u0131, uygulaman\u0131z\u0131n art\u0131k ihtiya\u00e7 duymad\u0131\u011f\u0131, ancak \u00e7\u00f6p toplay\u0131c\u0131 taraf\u0131ndan temizlenemeyen bellek alanlar\u0131n\u0131n birikmesidir. Bu durum, genellikle bir nesneye gereksiz yere bir referans\u0131n hala tutulmas\u0131 nedeniyle olu\u015fur, bu da \u00e7\u00f6p toplay\u0131c\u0131n\u0131n o nesneyi \"eri\u015filebilir\" olarak alg\u0131lamas\u0131na ve temizlememesine yol a\u00e7ar.<\/p>\n
              \u00c7\u00f6p toplay\u0131c\u0131y\u0131 manuel olarak tetikleyebilir miyim?<\/h4>\n
              Hay\u0131r, standart JavaScript'te \u00e7\u00f6p toplay\u0131c\u0131y\u0131 manuel olarak tetiklemek i\u00e7in bir API bulunmamaktad\u0131r. Bu, \u00e7\u00f6p toplay\u0131c\u0131n\u0131n uygulaman\u0131n performans\u0131n\u0131 en iyi \u015fekilde y\u00f6netmesi i\u00e7in motorun kontrol\u00fcnde olmas\u0131n\u0131 sa\u011flamak i\u00e7indir. Ancak, baz\u0131 geli\u015ftirme ortamlar\u0131nda veya test senaryolar\u0131nda, taray\u0131c\u0131 geli\u015ftirici ara\u00e7lar\u0131 arac\u0131l\u0131\u011f\u0131yla manuel tetikleme se\u00e7enekleri bulunabilir (\u00f6rne\u011fin Chrome DevTools'ta).<\/p>\n
              Hangi JavaScript motorlar\u0131 hangi GC algoritmalar\u0131n\u0131 kullan\u0131r?<\/h4>\n
              Modern JavaScript motorlar\u0131 (V8, SpiderMonkey, JavaScriptCore) genellikle \u0130\u015faretle ve S\u00fcp\u00fcr algoritmas\u0131n\u0131n geli\u015fmi\u015f varyantlar\u0131n\u0131 kullan\u0131r. Bu varyantlar aras\u0131nda Nesilsel \u00c7\u00f6p Toplama, Art\u0131ml\u0131 ve E\u015fzamanl\u0131 \u00c7\u00f6p Toplama teknikleri bulunur. \u00d6rne\u011fin, V8 motoru \"Orinoco\" adl\u0131 bir \u00e7\u00f6p toplay\u0131c\u0131 sistemi kullan\u0131r ve bu sistem birden fazla algoritmay\u0131 (Mark-Sweep, Mark-Compact, Scavenger, Parallel, Incremental, Concurrent) bir araya getirir.<\/p>\n
              \u00c7\u00f6p toplay\u0131c\u0131 performans sorunlar\u0131na neden olur mu?<\/h4>\n
              Evet, \u00e7\u00f6p toplay\u0131c\u0131 \u00e7al\u0131\u015f\u0131rken uygulaman\u0131n ana i\u015f par\u00e7ac\u0131\u011f\u0131 k\u0131sa s\u00fcreli\u011fine duraklayabilir (stop-the-world pause). Bu duraklamalar, \u00f6zellikle b\u00fcy\u00fck bellek y\u0131\u011f\u0131nlar\u0131nda veya yo\u011fun \u00e7\u00f6p toplama aktivitelerinde fark edilebilir gecikmelere neden olabilir ve kullan\u0131c\u0131 deneyimini olumsuz etkileyebilir. Ancak modern \u00e7\u00f6p toplay\u0131c\u0131lar, bu duraklamalar\u0131 milisaniyeler seviyesine indirerek etkiyi minimize etmeye \u00e7al\u0131\u015f\u0131r.<\/p>\n
              Bellek s\u0131z\u0131nt\u0131lar\u0131n\u0131 nas\u0131l tespit edebilirim?<\/h4>\n
              Bellek s\u0131z\u0131nt\u0131lar\u0131n\u0131 tespit etmek i\u00e7in taray\u0131c\u0131lar\u0131n geli\u015ftirici ara\u00e7lar\u0131n\u0131 kullanabilirsiniz. \u00d6zellikle Chrome DevTools'taki \"Memory\" sekmesi, Heap Snapshot'lar\u0131 alman\u0131za, bellek kullan\u0131m grafiklerini incelemenize ve nesnelerin referans a\u011fa\u00e7lar\u0131n\u0131 g\u00f6r\u00fcnt\u00fclemenize olanak tan\u0131r. Bu ara\u00e7lar, hangi nesnelerin bellekte gereksiz yere kald\u0131\u011f\u0131n\u0131 ve bunlara hangi referanslar\u0131n tutuldu\u011funu anlaman\u0131za yard\u0131mc\u0131 olur.<\/p>\n","protected":false},"excerpt":{"rendered":"Bellek y\u00f6netimi, herhangi bir yaz\u0131l\u0131m uygulamas\u0131n\u0131n verimli ve kararl\u0131 \u00e7al\u0131\u015fmas\u0131 i\u00e7in hayati \u00f6neme sahiptir. Yetersiz bellek y\u00f6netimi, uygulaman…","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":[129],"tags":[],"class_list":{"0":"post-38000","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-javascript","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"\nJavaScript'in Gizli Ya\u015fam\u0131: \u00c7\u00f6p Toplay\u0131c\u0131 - Kodlar\u0131n Gizemli D\u00fcnyas\u0131<\/title>\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\/javascriptin-gizli-yasami-cop-toplayici\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JavaScript'in Gizli Ya\u015fam\u0131: \u00c7\u00f6p Toplay\u0131c\u0131\" \/>\n<meta property=\"og:description\" content=\"Bellek y\u00f6netimi, herhangi bir yaz\u0131l\u0131m uygulamas\u0131n\u0131n verimli ve kararl\u0131 \u00e7al\u0131\u015fmas\u0131 i\u00e7in hayati \u00f6neme sahiptir. 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