{"id":15124,"date":"2025-03-14T06:45:16","date_gmt":"2025-03-14T03:45:16","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/javascriptte-asenkron-programlama-anlayisi\/"},"modified":"2025-03-14T06:45:16","modified_gmt":"2025-03-14T03:45:16","slug":"javascriptte-asenkron-programlama-anlayisi","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/javascriptte-asenkron-programlama-anlayisi\/","title":{"rendered":"JavaScript&#8217;te Asenkron Programlama Anlay\u0131\u015f\u0131"},"content":{"rendered":"<p><body><\/p>\n<p>JavaScript&#8217;te Asenkron Programlama Anlay\u0131\u015f\u0131<\/p>\n<p>Merhaba! Fatih Soysal olarak, JavaScript&#8217;te asenkron programlaman\u0131n karma\u015f\u0131k d\u00fcnyas\u0131na dalaca\u011f\u0131z.  Bu rehberde, asenkron programlaman\u0131n ne oldu\u011funu, neden \u00f6nemli oldu\u011funu ve JavaScript&#8217;te bunu nas\u0131l etkili bir \u015fekilde y\u00f6netebilece\u011finizi a\u00e7\u0131klayaca\u011f\u0131m.  \u00d6ncelikle, temelleri kavramak i\u00e7in senkron programlamaya k\u0131saca de\u011finelim.<\/p>\n<h2>Senkron Programlama ve S\u0131n\u0131rlamalar\u0131<\/h2>\n<p>Senkron programlamada, kod sat\u0131rlar\u0131 s\u0131rayla, bir \u00f6nceki sat\u0131r tamamlanmadan bir sonraki sat\u0131r\u0131n \u00e7al\u0131\u015ft\u0131r\u0131lmamas\u0131 mant\u0131\u011f\u0131yla \u00e7al\u0131\u015f\u0131r.  Bu, basit programlar i\u00e7in olduk\u00e7a anla\u015f\u0131l\u0131r ve kullan\u0131\u015fl\u0131d\u0131r.  Ancak, a\u011f istekleri veya dosya okuma gibi zaman alan i\u015flemler s\u00f6z konusu oldu\u011funda, program\u0131n tamam\u0131 bu i\u015flemin tamamlanmas\u0131n\u0131 beklemek zorunda kal\u0131r. Bu durum, uygulama performans\u0131n\u0131 ciddi \u015fekilde d\u00fc\u015f\u00fcr\u00fcr.  Bu nedenle, zaman alan i\u015flemler i\u00e7in asenkron programlama devreye girer.<\/p>\n<h2>Asenkron Programlaman\u0131n \u00d6nemi<\/h2>\n<p>Asenkron programlama, zaman alan i\u015flemlerin ana program ak\u0131\u015f\u0131n\u0131 engellemeden arka planda \u00e7al\u0131\u015fmas\u0131n\u0131 sa\u011flar.  \u00d6rne\u011fin, bir web sayfas\u0131nda bir API&#8217;den veri \u00e7ekerken, asenkron yakla\u015f\u0131m sayesinde, veri \u00e7ekim i\u015flemi tamamlanana kadar sayfan\u0131n geri kalan\u0131 donmaz ve kullan\u0131c\u0131 etkile\u015fime devam edebilir. Bu, daha h\u0131zl\u0131 ve daha duyarl\u0131 uygulamalar geli\u015ftirmemizi sa\u011flar.  Ayr\u0131ca, kaynak kullan\u0131m\u0131n\u0131 optimize eder ve daha verimli bir kod yazmam\u0131z\u0131 m\u00fcmk\u00fcn k\u0131lar.<\/p>\n<h2>Asenkron Programlama Teknikleri<\/h2>\n<p>JavaScript&#8217;te asenkron programlamay\u0131 ger\u00e7ekle\u015ftirmek i\u00e7in \u00e7e\u015fitli y\u00f6ntemler kullan\u0131l\u0131r. Bunlardan en yayg\u0131nlar\u0131 callback fonksiyonlar\u0131, Promise&#8217;ler ve async\/await&#8217;tir.  Hadi, her birini daha detayl\u0131 inceleyelim.<\/p>\n<h3>Callback Fonksiyonlar\u0131<\/h3>\n<p>Callback fonksiyonlar\u0131, asenkron i\u015flemlerin tamamland\u0131\u011f\u0131nda \u00e7al\u0131\u015ft\u0131r\u0131lacak fonksiyonlard\u0131r.  Bir \u00f6rnek olarak, bir dosya okuma i\u015flemi d\u00fc\u015f\u00fcnelim:<\/p>\n<pre><code>\n\/\/ \u00d6rnek callback fonksiyonu\nfs.readFile('dosya.txt', (err, data) => {\n  if (err) {\n    console.error(err);\n  } else {\n    console.log(data);\n  }\n});\n<\/code><\/pre>\n<p>Bu kodda, <code>fs.readFile<\/code> fonksiyonu dosyay\u0131 okuduktan sonra, hata durumunda hata mesaj\u0131, aksi halde dosya i\u00e7eri\u011fini yazd\u0131ran callback fonksiyonunu \u00e7al\u0131\u015ft\u0131r\u0131r.  Ancak, \u00e7ok say\u0131da callback fonksiyonu kullan\u0131ld\u0131\u011f\u0131nda &#8220;callback cehennemi&#8221; ad\u0131 verilen bir durum ortaya \u00e7\u0131kabilir ve kod okunabilirli\u011fini ve y\u00f6netilebilirli\u011fini zorla\u015ft\u0131rabilir.<\/p>\n<h3>Promise&#8217;ler<\/h3>\n<p>Promise&#8217;ler, asenkron i\u015flemlerin sonucunu temsil eden nesnelerdir.  Callback&#8217;lere g\u00f6re daha temiz ve okunabilir bir kod yaz\u0131lmas\u0131n\u0131 sa\u011flar.  Bir Promise \u00fc\u00e7 durumda bulunabilir: <em>pending<\/em> (bekleyen), <em>fulfilled<\/em> (tamamlanm\u0131\u015f) veya <em>rejected<\/em> (reddedilmi\u015f).<\/p>\n<pre><code>\n\/\/ \u00d6rnek Promise kullan\u0131m\u0131\nconst promise = new Promise((resolve, reject) => {\n  \/\/ Asenkron i\u015flem burada\n  setTimeout(() => {\n    resolve(\"\u0130\u015flem ba\u015far\u0131l\u0131!\");\n  }, 1000);\n});\n\npromise.then(result => {\n  console.log(result);\n}).catch(error => {\n  console.error(error);\n});\n<\/code><\/pre>\n<p>Burada, <code>then<\/code> metodu ba\u015far\u0131l\u0131 bir sonucu, <code>catch<\/code> metodu ise bir hatay\u0131 i\u015fler.<\/p>\n<h3>Async\/Await<\/h3>\n<p>Async\/await, Promise&#8217;leri daha senkron bir \u015fekilde kullanmam\u0131z\u0131 sa\u011flayan bir s\u00f6zdizimsel \u015fekerdir.  Kodun okunabilirli\u011fini ve bak\u0131m\u0131n\u0131 kolayla\u015ft\u0131r\u0131r.<\/p>\n<pre><code>\nasync function fetchData() {\n  try {\n    const response = await fetch('api.com\/data');\n    const data = await response.json();\n    console.log(data);\n  } catch (error) {\n    console.error(error);\n  }\n}\n\nfetchData();\n<\/code><\/pre>\n<p><code>await<\/code> anahtar kelimesi, bir Promise&#8217;in \u00e7\u00f6z\u00fcmlenmesini bekler ve sonucu d\u00f6nd\u00fcr\u00fcr.  <code>try...catch<\/code> blo\u011fu ise hatalar\u0131 yakalamak i\u00e7in kullan\u0131l\u0131r. Async\/await ile asenkron kodlar neredeyse senkron kodlar gibi okunabilir ve yaz\u0131l\u0131r.<\/p>\n<h2>Event Loop ve Single-Threaded Nature<\/h2>\n<p>JavaScript&#8217;in tek i\u015f par\u00e7ac\u0131kl\u0131 (single-threaded) yap\u0131s\u0131 nedeniyle, asenkron i\u015flemler i\u00e7in event loop mekanizmas\u0131 kullan\u0131l\u0131r. Event loop, asenkron i\u015flemlerin tamamlanmas\u0131n\u0131 izler ve tamamlanan i\u015flemlerin callback fonksiyonlar\u0131n\u0131 \u00e7a\u011f\u0131r\u0131r.  Bu sayede, ana i\u015f par\u00e7ac\u0131\u011f\u0131 engellenmeden, asenkron i\u015flemler arka planda y\u00f6netilir.  Daha detayl\u0131 bilgi i\u00e7in <a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/EventLoop\" target=\"_blank\">Mozilla Developer Network<\/a>  kayna\u011f\u0131n\u0131 inceleyebilirsiniz.<\/p>\n<h2>Sonu\u00e7<\/h2>\n<p>JavaScript&#8217;te asenkron programlama, performansl\u0131 ve duyarl\u0131 uygulamalar geli\u015ftirmek i\u00e7in olmazsa olmazd\u0131r.  Callback&#8217;ler, Promise&#8217;ler ve async\/await gibi farkl\u0131 teknikler, farkl\u0131 ihtiya\u00e7lara g\u00f6re tercih edilebilir.  Ancak, kodun okunabilirli\u011fi ve s\u00fcrd\u00fcr\u00fclebilirli\u011fi her zaman \u00f6n planda tutulmal\u0131d\u0131r.  Bu rehberin, JavaScript&#8217;te asenkron programlamay\u0131 anlaman\u0131za ve uygulaman\u0131za yard\u0131mc\u0131 olaca\u011f\u0131n\u0131 umuyorum.  Daha fazla bilgi ve JavaScript ile ilgili di\u011fer konular i\u00e7in <a href=\"https:\/\/fatihsoysal.com\" target=\"_blank\">web sitemi<\/a> ziyaret edebilirsiniz.<\/p>\n<p>#Etiketler: JavaScript, Asenkron Programlama, Callback, Promise, Async\/Await, Node.js, Event Loop, Single-Threaded, JavaScript \u00d6\u011frenme, Web Geli\u015ftirme<\/p>\n<p><\/body><br \/>\n<\/html><\/p>\n","protected":false},"excerpt":{"rendered":"JavaScript&#8217;te Asenkron Programlama Anlay\u0131\u015f\u0131 Merhaba! Fatih Soysal olarak, JavaScript&#8217;te asenkron programlaman\u0131n karma\u015f\u0131k d\u00fcnyas\u0131na dalaca\u011f\u0131z. Bu rehberde, asenkron programlaman\u0131n&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-15124","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>JavaScript&#039;te Asenkron Programlama Anlay\u0131\u015f\u0131<\/title>\n<meta name=\"description\" content=\"Merhaba! Fatih Soysal olarak, JavaScript&#039;te asenkron programlaman\u0131n karma\u015f\u0131k d\u00fcnyas\u0131na dalaca\u011f\u0131z. Bu rehberde, asenkron programlaman\u0131n ne oldu\u011funu, neden \u00f6nemli oldu\u011funu ve JavaScript&#039;te bunu nas\u0131l etkili bir \u015fekilde y\u00f6netebilece\u011finizi a\u00e7\u0131klayaca\u011f\u0131m. \u00d6ncelikle, temelleri kavramak i\u00e7in senkron programlamaya k\u0131saca de\u011finelim.\" \/>\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\/javascriptte-asenkron-programlama-anlayisi\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JavaScript&#039;te Asenkron Programlama Anlay\u0131\u015f\u0131\" \/>\n<meta property=\"og:description\" content=\"Merhaba! Fatih Soysal olarak, JavaScript&#039;te asenkron programlaman\u0131n karma\u015f\u0131k d\u00fcnyas\u0131na dalaca\u011f\u0131z. Bu rehberde, asenkron programlaman\u0131n ne oldu\u011funu, neden \u00f6nemli oldu\u011funu ve JavaScript&#039;te bunu nas\u0131l etkili bir \u015fekilde y\u00f6netebilece\u011finizi a\u00e7\u0131klayaca\u011f\u0131m. \u00d6ncelikle, temelleri kavramak i\u00e7in senkron programlamaya k\u0131saca de\u011finelim.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fatihsoysal.com\/blog\/javascriptte-asenkron-programlama-anlayisi\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2025-03-14T03:45:16+00:00\" \/>\n<meta name=\"author\" content=\"Fatih Soysal\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Yazan:\" \/>\n\t<meta name=\"twitter:data1\" content=\"Fatih Soysal\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tahmini okuma s\u00fcresi\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 dakika\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/javascriptte-asenkron-programlama-anlayisi\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/javascriptte-asenkron-programlama-anlayisi\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"JavaScript&#8217;te Asenkron Programlama Anlay\u0131\u015f\u0131\",\"datePublished\":\"2025-03-14T03:45:16+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/javascriptte-asenkron-programlama-anlayisi\/\"},\"wordCount\":648,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/javascriptte-asenkron-programlama-anlayisi\/#respond\"]}],\"copyrightYear\":\"2025\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/javascriptte-asenkron-programlama-anlayisi\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/javascriptte-asenkron-programlama-anlayisi\/\",\"name\":\"JavaScript'te Asenkron Programlama Anlay\u0131\u015f\u0131\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\"},\"datePublished\":\"2025-03-14T03:45:16+00:00\",\"description\":\"Merhaba! 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Fatih Soysal olarak, JavaScript'te asenkron programlaman\u0131n karma\u015f\u0131k d\u00fcnyas\u0131na dalaca\u011f\u0131z. 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