{"id":7573,"date":"2024-12-24T20:45:11","date_gmt":"2024-12-24T17:45:11","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/javascriptte-this-kavrami-detayli-anlatim\/"},"modified":"2024-12-24T20:45:11","modified_gmt":"2024-12-24T17:45:11","slug":"javascriptte-this-kavrami-detayli-anlatim","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/javascriptte-this-kavrami-detayli-anlatim\/","title":{"rendered":"JavaScript&#8217;te `this` Kavram\u0131: Detayl\u0131 Anlat\u0131m"},"content":{"rendered":"<p>JavaScript&#8217;te this Kavram\u0131: Detayl\u0131 Anlat\u0131m<\/p>\n<p>JavaScript&#8217;te this anahtar kelimesi, bir\u00e7ok geli\u015ftirici i\u00e7in kafa kar\u0131\u015f\u0131kl\u0131\u011f\u0131 yaratan bir konudur.  Ancak,  anla\u015f\u0131lmas\u0131 olduk\u00e7a basittir.  \u00d6ncelikle, this&#8217;in ne oldu\u011funu, nerede kullan\u0131ld\u0131\u011f\u0131n\u0131 ve nas\u0131l davrand\u0131\u011f\u0131n\u0131 ad\u0131m ad\u0131m inceleyelim.  Bu makalede, this kavram\u0131n\u0131 farkl\u0131 ba\u011flamlarda ele alarak, kod \u00f6rnekleriyle destekleyerek detayl\u0131 bir a\u00e7\u0131klama sunaca\u011f\u0131z.  Umar\u0131m bu makale,  this&#8217;i anlamada size yard\u0131mc\u0131 olur.<\/p>\n<h2>this Nedir?<\/h2>\n<p>K\u0131saca \u00f6zetlemek gerekirse, this,  \u00e7a\u011fr\u0131ld\u0131\u011f\u0131 ba\u011flama g\u00f6re de\u011fi\u015fen bir nesnedir.  Ba\u015fka bir deyi\u015fle,  this  fonksiyonun nerede \u00e7a\u011fr\u0131ld\u0131\u011f\u0131na ba\u011fl\u0131 olarak farkl\u0131 nesnelere i\u015faret eder. Bu ba\u011flam,  fonksiyonun nas\u0131l tan\u0131mland\u0131\u011f\u0131 ve nas\u0131l \u00e7a\u011fr\u0131ld\u0131\u011f\u0131 ile belirlenir.<\/p>\n<h2>this&#8217;in Davran\u0131\u015f\u0131n\u0131 Belirleyen Fakt\u00f6rler<\/h2>\n<p> this&#8217;in de\u011ferini d\u00f6rt ana fakt\u00f6r belirler:<\/p>\n<ol>\n<li><strong>Fonksiyonun nas\u0131l \u00e7a\u011fr\u0131ld\u0131\u011f\u0131:<\/strong>  Bir fonksiyonu nas\u0131l \u00e7a\u011f\u0131rd\u0131\u011f\u0131n\u0131z this&#8217;in de\u011ferini do\u011frudan etkiler.  \u00d6rne\u011fin, bir nesnenin metodu olarak \u00e7a\u011fr\u0131ld\u0131\u011f\u0131nda this, o nesneyi i\u015faret eder. <\/li>\n<li><strong>call(), apply(), bind() metotlar\u0131:<\/strong> Bu metotlar,  fonksiyonun this ba\u011flam\u0131n\u0131 a\u00e7\u0131k\u00e7a belirlemenizi sa\u011flar. Bu sayede, fonksiyonun hangi nesneye aitmi\u015f gibi davranaca\u011f\u0131n\u0131 kontrol edebilirsiniz.<\/li>\n<li><strong>Arrow Fonksiyonlar:<\/strong> Arrow fonksiyonlar\u0131nda (=>), this leksikal olarak ba\u011flan\u0131r; yani,  fonksiyonun tan\u0131mland\u0131\u011f\u0131 ba\u011flamda de\u011ferini al\u0131r.  Bu,  normal fonksiyonlardan \u00f6nemli bir farkt\u0131r.<\/li>\n<li><strong>this ba\u011flam\u0131n\u0131n bulunamamas\u0131:<\/strong> Baz\u0131 durumlarda,  this&#8217;in ba\u011flam\u0131 belirlenemez.  Bu durumda,  this genellikle window (taray\u0131c\u0131da) veya global (Node.js&#8217;de) nesnesini i\u015faret eder.  Ancak,  &#8216;use strict&#8217; modu bu durumu \u00f6nler ve bir hata f\u0131rlat\u0131r.<\/li>\n<\/ol>\n<h2>Kod \u00d6rnekleri<\/h2>\n<p>\u015eimdi, this&#8217;in farkl\u0131 ba\u011flamlardaki davran\u0131\u015f\u0131n\u0131 g\u00f6steren baz\u0131 kod \u00f6rneklerine bakal\u0131m:<\/p>\n<h3>\u00d6rnek 1: Nesne Metodu Olarak \u00c7a\u011f\u0131rma<\/h3>\n<pre><code class=\"language-javascript\">\nconst myObject = {\n  name: \"Fatih Soysal\",\n  greet: function() {\n    console.log(\"Merhaba, benim ad\u0131m \" + this.name); \n  }\n};\n\nmyObject.greet(); \/\/ \u00c7\u0131kt\u0131: Merhaba, benim ad\u0131m Fatih Soysal\n<\/code><\/pre>\n<p>Bu \u00f6rnekte, greet() fonksiyonu myObject nesnesinin metodu olarak tan\u0131mlanm\u0131\u015ft\u0131r.  Bu y\u00fczden, this  myObject&#8217;i i\u015faret eder.<\/p>\n<h3>\u00d6rnek 2: call() Metodu ile this Ba\u011flam\u0131n\u0131 De\u011fi\u015ftirme<\/h3>\n<pre><code class=\"language-javascript\">\nfunction greet(message) {\n  console.log(message + \", benim ad\u0131m \" + this.name);\n}\n\nconst person1 = { name: \"Ahmet\" };\nconst person2 = { name: \"Mehmet\" };\n\ngreet.call(person1, \"Selam\"); \/\/ \u00c7\u0131kt\u0131: Selam, benim ad\u0131m Ahmet\ngreet.call(person2, \"Merhaba\"); \/\/ \u00c7\u0131kt\u0131: Merhaba, benim ad\u0131m Mehmet\n<\/code><\/pre>\n<p>Burada, call() metodu ile greet() fonksiyonunun this ba\u011flam\u0131n\u0131 s\u0131ras\u0131yla person1 ve person2 nesnelerine ayarl\u0131yoruz.<\/p>\n<h3>\u00d6rnek 3: Arrow Fonksiyonlar\u0131<\/h3>\n<pre><code class=\"language-javascript\">\nconst myObject = {\n  name: \"Fatih Soysal\",\n  greet: () => {\n    console.log(\"Merhaba, benim ad\u0131m \" + this.name); \n  }\n};\n\nmyObject.greet(); \/\/ \u00c7\u0131kt\u0131: Merhaba, benim ad\u0131m undefined (veya global scope'taki name de\u011feri)\n<\/code><\/pre>\n<p>Arrow fonksiyonlar\u0131nda this, leksikal ba\u011flama sahiptir. Bu \u00f6rnekte, global scope&#8217;taki this de\u011ferini alacakt\u0131r.  E\u011fer global scope&#8217;da bir name de\u011fi\u015fkeni tan\u0131ml\u0131ysa, o de\u011feri yazd\u0131racakt\u0131r; aksi takdirde undefined yazd\u0131r\u0131r. <\/p>\n<h2>Sonu\u00e7<\/h2>\n<p>Umar\u0131m bu makale, JavaScript&#8217;te this anahtar kelimesini daha iyi anlaman\u0131za yard\u0131mc\u0131 olmu\u015ftur.  this&#8217;in davran\u0131\u015f\u0131n\u0131 anlamak,  JavaScript ile geli\u015ftirme yaparken olduk\u00e7a \u00f6nemlidir.  Daha fazla bilgi i\u00e7in <a href=\"https:\/\/fatihsoysal.com\">fatihsoysal.com<\/a> sitesini ziyaret edebilirsiniz.  Ayr\u0131ca,  konu hakk\u0131nda daha detayl\u0131 bilgi edinmek i\u00e7in <a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Operators\/this\">MDN Web Docs<\/a>  belgelerine g\u00f6z atabilirsiniz.<\/p>\n<p>#Etiketler: JavaScript, this, ba\u011flam, fonksiyon, nesne, arrow fonksiyon, call, apply, bind, programlama, web geli\u015ftirme<\/p>\n","protected":false},"excerpt":{"rendered":"JavaScript&#8217;te this Kavram\u0131: Detayl\u0131 Anlat\u0131m JavaScript&#8217;te this anahtar kelimesi, bir\u00e7ok geli\u015ftirici i\u00e7in kafa kar\u0131\u015f\u0131kl\u0131\u011f\u0131 yaratan bir konudur. Ancak,&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-7573","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 `this` Kavram\u0131: Detayl\u0131 Anlat\u0131m<\/title>\n<meta name=\"description\" content=\"JavaScript&#039;te `this` anahtar kelimesi, bir\u00e7ok geli\u015ftirici i\u00e7in kafa kar\u0131\u015f\u0131kl\u0131\u011f\u0131 yaratan bir konudur. Ancak, anla\u015f\u0131lmas\u0131 olduk\u00e7a basittir. \u00d6ncelikle, `this`&#039;in ne oldu\u011funu, nerede kullan\u0131ld\u0131\u011f\u0131n\u0131 ve nas\u0131l davrand\u0131\u011f\u0131n\u0131 ad\u0131m ad\u0131m inceleyelim. Bu makalede, `this` kavram\u0131n\u0131 farkl\u0131 ba\u011flamlarda ele alarak, kod \u00f6rnekleriyle destekleyerek detayl\u0131 bir a\u00e7\u0131klama sunaca\u011f\u0131z. Umar\u0131m bu makale, `this`&#039;i anlamada size yard\u0131mc\u0131 olur.\" \/>\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-this-kavrami-detayli-anlatim\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JavaScript&#039;te `this` Kavram\u0131: Detayl\u0131 Anlat\u0131m\" \/>\n<meta property=\"og:description\" content=\"JavaScript&#039;te `this` anahtar kelimesi, bir\u00e7ok geli\u015ftirici i\u00e7in kafa kar\u0131\u015f\u0131kl\u0131\u011f\u0131 yaratan bir konudur. Ancak, anla\u015f\u0131lmas\u0131 olduk\u00e7a basittir. \u00d6ncelikle, `this`&#039;in ne oldu\u011funu, nerede kullan\u0131ld\u0131\u011f\u0131n\u0131 ve nas\u0131l davrand\u0131\u011f\u0131n\u0131 ad\u0131m ad\u0131m inceleyelim. Bu makalede, `this` kavram\u0131n\u0131 farkl\u0131 ba\u011flamlarda ele alarak, kod \u00f6rnekleriyle destekleyerek detayl\u0131 bir a\u00e7\u0131klama sunaca\u011f\u0131z. 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Ancak, anla\u015f\u0131lmas\u0131 olduk\u00e7a basittir. \u00d6ncelikle, `this`'in ne oldu\u011funu, nerede kullan\u0131ld\u0131\u011f\u0131n\u0131 ve nas\u0131l davrand\u0131\u011f\u0131n\u0131 ad\u0131m ad\u0131m inceleyelim. Bu makalede, `this` kavram\u0131n\u0131 farkl\u0131 ba\u011flamlarda ele alarak, kod \u00f6rnekleriyle destekleyerek detayl\u0131 bir a\u00e7\u0131klama sunaca\u011f\u0131z. 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