\nJavaScript, web geli\u015ftirmenin temel ta\u015flar\u0131ndan biri olup, sundu\u011fu dinamik ve esnek yap\u0131yla milyonlarca uygulaman\u0131n kalbinde yer al\u0131r. Bu esnekli\u011fin arkas\u0131nda yatan baz\u0131 mekanizmalar, dilin \u00e7al\u0131\u015fma prensiplerini anlamak i\u00e7in kritik \u00f6neme sahiptir. “Hoisting” de bu mekanizmalardan biridir. Ba\u015flang\u0131\u00e7ta kafa kar\u0131\u015ft\u0131r\u0131c\u0131 gibi g\u00f6r\u00fcnse de, Hoisting’i kavramak, daha temiz, hatas\u0131z ve \u00f6ng\u00f6r\u00fclebilir JavaScript kodu yazman\u0131n anahtar\u0131d\u0131r. Bu rehberde, Hoisting’in ne oldu\u011funu, farkl\u0131 de\u011fi\u015fken ve fonksiyon t\u00fcrleri \u00fczerindeki etkilerini, pratik sonu\u00e7lar\u0131n\u0131 ve en iyi uygulama y\u00f6ntemlerini detayl\u0131 bir \u015fekilde inceleyece\u011fiz.\n<\/p>\n
\nJavaScript’te Hoisting, kodunuzdaki de\u011fi\u015fken ve fonksiyon bildirimlerinin, fiziksel olarak yazd\u0131\u011f\u0131n\u0131z yerden ba\u011f\u0131ms\u0131z olarak, kapsayan ba\u011flamlar\u0131n\u0131n (scope) en \u00fcst\u00fcne ta\u015f\u0131nmas\u0131 olarak kavramsal<\/i> bir davran\u0131\u015f\u0131 ifade eder. Yani, JavaScript motoru kodu \u00e7al\u0131\u015ft\u0131rmadan \u00f6nce, t\u00fcm de\u011fi\u015fken ve fonksiyon bildirimlerini tarar ve onlar\u0131 mevcut kapsam\u0131n en \u00fcst\u00fcne “\u00e7\u0131kar\u0131r”. Bu durum, bir de\u011fi\u015fkeni veya fonksiyonu tan\u0131mlamadan \u00f6nce kullanabilmenize olanak tan\u0131r.\n<\/p>\n
\nAncak “ta\u015f\u0131nma” kelimesi burada yan\u0131lt\u0131c\u0131 olabilir. Ger\u00e7ekte kod sat\u0131rlar\u0131 fiziksel olarak yukar\u0131 ta\u015f\u0131nmaz. JavaScript motoru, kodu iki a\u015famada i\u015fler:\n<\/p>\n
var<\/code>, let<\/code>, const<\/code>) ve fonksiyon bildirimlerini (function declarations) haf\u0131zaya al\u0131r. var<\/code> ile bildirilen de\u011fi\u015fkenlere varsay\u0131lan olarak undefined<\/code> de\u011feri atan\u0131rken, fonksiyon bildirimleri tamamen haf\u0131zaya al\u0131n\u0131r. let<\/code> ve const<\/code> ile bildirilen de\u011fi\u015fkenler de hoisted edilir ancak ba\u015flang\u0131\u00e7ta bir de\u011fer almazlar ve “Temporal Dead Zone” (Ge\u00e7ici \u00d6l\u00fc B\u00f6lge) olarak bilinen bir duruma girerler.<\/li>\n- Y\u00fcr\u00fctme Faz\u0131 (Execution Phase):<\/strong> Bu a\u015famada, kod sat\u0131r sat\u0131r \u00e7al\u0131\u015ft\u0131r\u0131l\u0131r. De\u011fi\u015fkenlere ger\u00e7ek de\u011ferleri atan\u0131r ve fonksiyonlar \u00e7a\u011fr\u0131l\u0131r.<\/li>\n<\/ul>\n
\nHoisting, bu ilk derleme faz\u0131nda ger\u00e7ekle\u015fen bir \u00f6n i\u015flem ad\u0131m\u0131d\u0131r. Bu sayede, kodun y\u00fcr\u00fctme a\u015famas\u0131na gelindi\u011finde, t\u00fcm bildirimler zaten biliniyor olur.\n<\/p>\n
De\u011fi\u015fken Hoisting’i: var<\/code>, let<\/code>, ve const<\/code><\/h2>\n\nJavaScript’te de\u011fi\u015fken bildirmek i\u00e7in kullan\u0131lan anahtar kelimeler (var<\/code>, let<\/code>, const<\/code>), Hoisting davran\u0131\u015f\u0131nda farkl\u0131l\u0131klar g\u00f6sterir. Bu farkl\u0131l\u0131klar\u0131 anlamak, \u00f6zellikle eski ve yeni JavaScript kod tabanlar\u0131nda kar\u015f\u0131la\u015f\u0131labilecek hatalar\u0131 \u00f6nlemek i\u00e7in kritik \u00f6neme sahiptir.\n<\/p>\nvar<\/code> ile Hoisting<\/h3>\n\nvar<\/code> ile bildirilen de\u011fi\u015fkenler, kapsayan fonksiyonun veya global scope’un en \u00fcst\u00fcne hoisted edilir ve varsay\u0131lan olarak undefined<\/code> de\u011feri ile ba\u015flat\u0131l\u0131r. Bu, de\u011fi\u015fkenin tan\u0131mland\u0131\u011f\u0131 sat\u0131ra gelmeden \u00f6nce bile ona eri\u015filebilece\u011fi anlam\u0131na gelir, ancak bu eri\u015fim s\u0131ras\u0131nda de\u011feri undefined<\/code> olacakt\u0131r.\n<\/p>\n\nconsole.log(benimDegiskenim); \/\/ undefined\nvar benimDegiskenim = \"Merhaba D\u00fcnya!\";\nconsole.log(benimDegiskenim); \/\/ Merhaba D\u00fcnya!\n\n\/\/ JavaScript motoru bu kodu asl\u0131nda \u015f\u00f6yle g\u00f6r\u00fcr:\n\/\/ var benimDegiskenim;\n\/\/ console.log(benimDegiskenim); \/\/ undefined\n\/\/ benimDegiskenim = \"Merhaba D\u00fcnya!\";\n\/\/ console.log(benimDegiskenim); \/\/ Merhaba D\u00fcnya!\n<\/code><\/pre>\n\nBu davran\u0131\u015f, bazen beklenmedik hatalara yol a\u00e7abilir, \u00e7\u00fcnk\u00fc bir de\u011fi\u015fkenin undefined<\/code> olmas\u0131, program\u0131n mant\u0131\u011f\u0131n\u0131 bozabilir.\n<\/p>\nlet<\/code> ve const<\/code> ile Hoisting (Temporal Dead Zone – TDZ)<\/h3>\n\nECMAScript 2015 (ES6) ile tan\u0131t\u0131lan let<\/code> ve const<\/code> anahtar kelimeleri, var<\/code>‘\u0131n baz\u0131 sorunlar\u0131n\u0131 gidermek amac\u0131yla getirilmi\u015ftir ve farkl\u0131 bir Hoisting davran\u0131\u015f\u0131 sergilerler. let<\/code> ve const<\/code> ile bildirilen de\u011fi\u015fkenler de Hoisted edilir, yani kapsamlar\u0131n\u0131n en \u00fcst\u00fcne ta\u015f\u0131n\u0131rlar. Ancak, var<\/code>‘dan farkl\u0131 olarak, otomatik olarak undefined<\/code> ile ba\u015flat\u0131lmazlar. Bunun yerine, bildirim sat\u0131rlar\u0131na ula\u015f\u0131lana kadar “Temporal Dead Zone” (TDZ) ad\u0131 verilen bir durumda kal\u0131rlar.\n<\/p>\n\nTDZ, bir de\u011fi\u015fkenin kapsam\u0131n\u0131n ba\u015flang\u0131c\u0131ndan, bildiriminin yap\u0131ld\u0131\u011f\u0131 sat\u0131ra kadar olan s\u00fcreyi ifade eder. Bu s\u00fcre zarf\u0131nda de\u011fi\u015fkene eri\u015fmeye \u00e7al\u0131\u015fmak, bir ReferenceError<\/code> hatas\u0131na neden olur.\n<\/p>\n\n\/\/ console.log(ad); \/\/ ReferenceError: Cannot access 'ad' before initialization\nlet ad = \"Ali\";\nconsole.log(ad); \/\/ Ali\n\n\/\/ console.log(PI); \/\/ ReferenceError: Cannot access 'PI' before initialization\nconst PI = 3.14;\nconsole.log(PI); \/\/ 3.14\n<\/code><\/pre>\n\nBu davran\u0131\u015f, geli\u015ftiricileri de\u011fi\u015fkenleri kullanmadan \u00f6nce bildirmeye zorlayarak daha g\u00fcvenli ve \u00f6ng\u00f6r\u00fclebilir kod yazmaya te\u015fvik eder. TDZ, var<\/code>‘\u0131n neden oldu\u011fu yayg\u0131n hatalardan bir\u00e7o\u011funu engeller.\n<\/p>\nFonksiyon Hoisting’i: Bildirimler ve \u0130fadeler<\/h2>\n
\nDe\u011fi\u015fkenlerde oldu\u011fu gibi, fonksiyonlar da Hoisting davran\u0131\u015f\u0131nda farkl\u0131l\u0131klar g\u00f6sterir. JavaScript’te fonksiyonlar iki ana \u015fekilde tan\u0131mlanabilir: fonksiyon bildirimleri (function declarations) ve fonksiyon ifadeleri (function expressions).\n<\/p>\n
Fonksiyon Bildirimleri (Function Declarations)<\/h3>\n
\nFonksiyon bildirimleri, ad\u0131ndan da anla\u015f\u0131laca\u011f\u0131 gibi, bir fonksiyonu do\u011frudan tan\u0131mlayan yap\u0131lard\u0131r (\u00f6rne\u011fin, function myFunction() { ... }<\/code>). Bu t\u00fcr fonksiyonlar, de\u011fi\u015fkenlerden farkl\u0131 olarak, hem bildirimleri hem de tan\u0131mlar\u0131 ile birlikte tamamen Hoisted edilir. Bu, fonksiyonu tan\u0131mland\u0131\u011f\u0131 yerden \u00f6nce \u00e7a\u011f\u0131rabilece\u011finiz anlam\u0131na gelir.\n<\/p>\n\nselamVer(); \/\/ Merhaba!\n\nfunction selamVer() {\n console.log(\"Merhaba!\");\n}\n\n\/\/ JavaScript motoru bu kodu asl\u0131nda \u015f\u00f6yle g\u00f6r\u00fcr:\n\/\/ function selamVer() {\n\/\/ console.log(\"Merhaba!\");\n\/\/ }\n\/\/ selamVer(); \/\/ Merhaba!\n<\/code><\/pre>\n\nBu, fonksiyon bildirimlerinin kodun herhangi bir yerinden \u00e7a\u011fr\u0131labilmesini sa\u011flar ve kodunuzu daha mod\u00fcler bir \u015fekilde d\u00fczenlemenize olanak tan\u0131r (\u00f6rne\u011fin, t\u00fcm yard\u0131mc\u0131 fonksiyonlar\u0131 dosyan\u0131n en alt\u0131na yaz\u0131p en \u00fcstten \u00e7a\u011f\u0131rma).\n<\/p>\n
Fonksiyon \u0130fadeleri (Function Expressions)<\/h3>\n
\nFonksiyon ifadeleri, bir fonksiyonun bir de\u011fi\u015fkene atanmas\u0131yla olu\u015fturulur (\u00f6rne\u011fin, const myFunction = function() { ... }<\/code>). Bu durumda, Hoisting davran\u0131\u015f\u0131, fonksiyonun atand\u0131\u011f\u0131 de\u011fi\u015fkenin Hoisting kurallar\u0131na tabidir.\n<\/p>\n\nE\u011fer bir fonksiyon ifadesi var<\/code> ile bildirilmi\u015f bir de\u011fi\u015fkene atan\u0131rsa, sadece de\u011fi\u015fken Hoisted edilir ve undefined<\/code> ile ba\u015flat\u0131l\u0131r. Fonksiyonun kendisi, de\u011fi\u015fkenin atand\u0131\u011f\u0131 sat\u0131ra gelene kadar tan\u0131mlanmaz. Bu nedenle, fonksiyon ifadesini tan\u0131mland\u0131\u011f\u0131 yerden \u00f6nce \u00e7a\u011f\u0131rmaya \u00e7al\u0131\u015fmak bir TypeError<\/code>‘a (\u00e7\u00fcnk\u00fc undefined<\/code> bir fonksiyon de\u011fildir) veya ReferenceError<\/code>‘a (e\u011fer de\u011fi\u015fken hi\u00e7 tan\u0131mlanmam\u0131\u015fsa) yol a\u00e7ar.\n<\/p>\n\n\/\/ merhabaDunya(); \/\/ TypeError: merhabaDunya is not a function (\u00e7\u00fcnk\u00fc undefined'\u0131 \u00e7a\u011f\u0131rmaya \u00e7al\u0131\u015f\u0131yoruz)\nvar merhabaDunya = function() {\n console.log(\"Merhaba D\u00fcnya!\");\n};\nmerhabaDunya(); \/\/ Merhaba D\u00fcnya!\n<\/code><\/pre>\n\nE\u011fer fonksiyon ifadesi let<\/code> veya const<\/code> ile bildirilmi\u015f bir de\u011fi\u015fkene atan\u0131rsa, Hoisting davran\u0131\u015f\u0131 let<\/code>\/const<\/code> de\u011fi\u015fkenlerinin TDZ kural\u0131na uyar. Yani, de\u011fi\u015fken Hoisted edilir ancak bildirim sat\u0131r\u0131na ula\u015f\u0131lana kadar eri\u015filemez.\n<\/p>\n\n\/\/ selamla(); \/\/ ReferenceError: Cannot access 'selamla' before initialization\nconst selamla = function() {\n console.log(\"Selam!\");\n};\nselamla(); \/\/ Selam!\n<\/code><\/pre>\nArrow Fonksiyonlar (Arrow Functions)<\/h3>\n
\nArrow fonksiyonlar (=><\/code>), her zaman bir fonksiyon ifadesi olarak kabul edilir ve Hoisting davran\u0131\u015flar\u0131, atand\u0131klar\u0131 de\u011fi\u015fkenin t\u00fcr\u00fcne (var<\/code>, let<\/code>, const<\/code>) g\u00f6re belirlenir. Genellikle const<\/code> ile kullan\u0131ld\u0131klar\u0131 i\u00e7in, TDZ kurallar\u0131na tabidirler.\n<\/p>\n\n\/\/ topla(5, 3); \/\/ ReferenceError: Cannot access 'topla' before initialization\nconst topla = (a, b) => a + b;\nconsole.log(topla(5, 3)); \/\/ 8\n<\/code><\/pre>\nHoisting’in Pratik Etkileri ve En \u0130yi Uygulamalar<\/h2>\n
\nHoisting, JavaScript kodunuzun nas\u0131l \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 derinden etkileyen bir dil \u00f6zelli\u011fidir. Bu mekanizmay\u0131 anlamak, potansiyel hatalar\u0131 \u00f6nlemek ve daha iyi kod yazmak i\u00e7in hayati \u00f6neme sahiptir.\n<\/p>\n
Neden \u00d6nemli?<\/h3>\n\n- Beklenmedik Davran\u0131\u015flar:<\/strong> \u00d6zellikle
var<\/code> ile Hoisting, bir de\u011fi\u015fkenin undefined<\/code> olarak kullan\u0131lmas\u0131na yol a\u00e7arak beklenmedik sonu\u00e7lara veya hatalara neden olabilir.<\/li>\n- Hata Ay\u0131klama (Debugging):<\/strong> Hoisting’in mant\u0131\u011f\u0131n\u0131 bilmemek, kodunuzdaki hatalar\u0131n kayna\u011f\u0131n\u0131 bulmay\u0131 zorla\u015ft\u0131rabilir. Bir de\u011fi\u015fkenin veya fonksiyonun neden tan\u0131mlanmad\u0131\u011f\u0131 hatas\u0131n\u0131 ald\u0131\u011f\u0131n\u0131zda, Hoisting’i g\u00f6z \u00f6n\u00fcnde bulundurman\u0131z gerekir.<\/li>\n
- Kod Kalitesi ve Okunabilirlik:<\/strong> Hoisting’i do\u011fru anlamak ve buna g\u00f6re kod yazmak, daha okunabilir ve bak\u0131m\u0131 kolay kodlar olu\u015fturman\u0131za yard\u0131mc\u0131 olur.<\/li>\n<\/ul>\n
Kar\u015f\u0131la\u015f\u0131labilecek Hatalar<\/h3>\n\nundefined<\/code> de\u011ferine eri\u015fim (var<\/code> ile).<\/li>\nReferenceError<\/code>: Cannot access 'x' before initialization<\/code> (let<\/code>\/const<\/code> ile TDZ).<\/li>\nTypeError<\/code>: y is not a function<\/code> (fonksiyon ifadelerinin var<\/code> ile erken \u00e7a\u011fr\u0131lmas\u0131).<\/li>\n<\/ul>\nEn \u0130yi Uygulamalar (Best Practices)<\/h3>\n
\nHoisting’in do\u011fas\u0131n\u0131 g\u00f6z \u00f6n\u00fcnde bulundurarak, JavaScript kodunuzu daha g\u00fcvenli ve okunakl\u0131 hale getirmek i\u00e7in a\u015fa\u011f\u0131daki en iyi uygulamalar\u0131 benimseyebilirsiniz:\n<\/p>\n
\n- De\u011fi\u015fkenleri ve Fonksiyonlar\u0131 Tan\u0131mlamadan \u00d6nce Bildirin:<\/strong> Bu, Hoisting’in neden olabilece\u011fi belirsizlikleri ortadan kald\u0131r\u0131r. T\u00fcm de\u011fi\u015fkenlerinizi ve fonksiyonlar\u0131n\u0131z\u0131 (\u00f6zellikle fonksiyon ifadelerini) kullanmadan \u00f6nce, kapsamlar\u0131n\u0131n ba\u015f\u0131nda bildirin. Bu, kodunuzun ak\u0131\u015f\u0131n\u0131 daha \u00f6ng\u00f6r\u00fclebilir hale getirir.<\/li>\n
let<\/code> ve const<\/code> Kullan\u0131m\u0131n\u0131 Tercih Edin:<\/strong> Modern JavaScript’te var<\/code> yerine let<\/code> ve const<\/code> kullanmak, Temporal Dead Zone sayesinde de\u011fi\u015fkenlerin bildirilmeden \u00f6nce kullan\u0131lmas\u0131n\u0131 engelleyerek daha s\u0131k\u0131 bir hata kontrol\u00fc sa\u011flar. Bu, kodunuzdaki potansiyel hatalar\u0131 erken a\u015famada yakalaman\u0131za yard\u0131mc\u0131 olur.<\/li>\n- Fonksiyon \u0130fadelerini Kullan\u0131rken Dikkat Edin:<\/strong> Fonksiyon ifadeleri (\u00f6zellikle
let<\/code> veya const<\/code> ile atananlar) Hoisted edilmez. Bu nedenle, onlar\u0131 \u00e7a\u011f\u0131rmadan \u00f6nce tan\u0131mlad\u0131\u011f\u0131n\u0131zdan emin olun. E\u011fer bir fonksiyonu her yerden \u00e7a\u011f\u0131rabilme esnekli\u011fine ihtiyac\u0131n\u0131z varsa, fonksiyon bildirimlerini kullan\u0131n.<\/li>\n<\/ul>\nSonu\u00e7 ve S\u0131k\u00e7a Sorulan Sorular (SSS)<\/h2>\n
\nHoisting, JavaScript’in temel ancak s\u0131kl\u0131kla yanl\u0131\u015f anla\u015f\u0131lan bir \u00f6zelli\u011fidir. Kavramsal olarak bildirimlerin kapsamlar\u0131n\u0131n en \u00fcst\u00fcne ta\u015f\u0131nmas\u0131 anlam\u0131na gelir ve JavaScript motorunun derleme a\u015famas\u0131nda ger\u00e7ekle\u015ftirdi\u011fi bir \u00f6n i\u015flemdir. var<\/code>, let<\/code>, const<\/code> de\u011fi\u015fkenleri ve fonksiyon bildirimleri ile ifadeleri aras\u0131nda farkl\u0131 Hoisting davran\u0131\u015flar\u0131 sergilenir. var<\/code> de\u011fi\u015fkenleri undefined<\/code> ile ba\u015flat\u0131l\u0131rken, let<\/code> ve const<\/code> de\u011fi\u015fkenleri Temporal Dead Zone’a girer. Fonksiyon bildirimleri tamamen Hoisted edilirken, fonksiyon ifadeleri atand\u0131klar\u0131 de\u011fi\u015fkenin Hoisting kurallar\u0131na tabidir. Bu farkl\u0131l\u0131klar\u0131 anlamak, daha temiz, hatas\u0131z ve bak\u0131m\u0131 kolay JavaScript kodu yazmak i\u00e7in kritik \u00f6neme sahiptir. Modern JavaScript’te let<\/code> ve const<\/code> kullan\u0131m\u0131, Hoisting’in neden olabilece\u011fi bir\u00e7ok hatay\u0131 \u00f6nleyerek daha g\u00fcvenli bir geli\u015ftirme ortam\u0131 sunar.\n<\/p>\nS\u0131k\u00e7a Sorulan Sorular (SSS)<\/h3>\n\n- Hoisting bir hata m\u0131d\u0131r?<\/dt>\n
- Hay\u0131r, Hoisting bir hata veya kusur de\u011fildir; JavaScript dilinin tasarlanma \u015feklinin bir par\u00e7as\u0131d\u0131r. Ancak yanl\u0131\u015f anla\u015f\u0131ld\u0131\u011f\u0131nda veya k\u00f6t\u00fc kullan\u0131ld\u0131\u011f\u0131nda hatalara yol a\u00e7abilir.<\/dd>\n
- Temporal Dead Zone (TDZ) nedir?<\/dt>\n
- TDZ,
let<\/code> ve const<\/code> ile bildirilen bir de\u011fi\u015fkenin kapsam\u0131n\u0131n ba\u015flang\u0131c\u0131ndan, de\u011fi\u015fkenin bildiriminin yap\u0131ld\u0131\u011f\u0131 sat\u0131ra kadar olan b\u00f6lgedir. Bu b\u00f6lgede de\u011fi\u015fkene eri\u015fmeye \u00e7al\u0131\u015fmak ReferenceError<\/code> hatas\u0131na neden olur.<\/dd>\n- T\u00fcm JavaScript motorlar\u0131 Hoisting’i ayn\u0131 \u015fekilde mi uygular?<\/dt>\n
- Evet, ECMAScript standard\u0131 Hoisting davran\u0131\u015f\u0131n\u0131 tan\u0131mlar ve t\u00fcm uyumlu JavaScript motorlar\u0131 (V8, SpiderMonkey vb.) bu standarda uygun davranmak zorundad\u0131r.<\/dd>\n
var<\/code> yerine let<\/code> ve const<\/code> kullanmak Hoisting’i tamamen ortadan kald\u0131r\u0131r m\u0131?<\/dt>\n- Hay\u0131r,
let<\/code> ve const<\/code> ile bildirilen de\u011fi\u015fkenler de Hoisted edilir. Ancak, var<\/code>‘dan farkl\u0131 olarak, bildirim sat\u0131rlar\u0131na ula\u015f\u0131lana kadar ba\u015flat\u0131lmazlar ve TDZ’ye girerler. Bu, Hoisting’in neden olabilece\u011fi bir\u00e7ok hatay\u0131 \u00f6nler ancak kavram\u0131 ortadan kald\u0131rmaz.<\/dd>\n- Hoisting, sadece global kapsamda m\u0131 ge\u00e7erlidir?<\/dt>\n
- Hay\u0131r, Hoisting her kapsamda (global, fonksiyon kapsam\u0131, blok kapsam\u0131) ge\u00e7erlidir. De\u011fi\u015fkenler ve fonksiyonlar, kendi kapsayan kapsamlar\u0131n\u0131n en \u00fcst\u00fcne Hoisted edilir.<\/dd>\n<\/dl>\n
<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"JavaScript, web geli\u015ftirmenin temel ta\u015flar\u0131ndan biri olup, sundu\u011fu dinamik ve esnek yap\u0131yla milyonlarca uygulaman\u0131n kalbinde yer al\u0131r. Bu es","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-40213","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-genel","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"\n
Hoisting Nedir? - 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\/hoisting-nedir\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hoisting Nedir?\" \/>\n<meta property=\"og:description\" content=\"JavaScript, web geli\u015ftirmenin temel ta\u015flar\u0131ndan biri olup, sundu\u011fu dinamik ve esnek yap\u0131yla milyonlarca uygulaman\u0131n kalbinde yer al\u0131r. Bu es\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-25T08:41:29+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=\"9 dakika\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"Hoisting Nedir?\",\"datePublished\":\"2026-02-25T08:41:29+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/\"},\"wordCount\":1621,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/#respond\"]}],\"copyrightYear\":\"2026\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/\",\"name\":\"Hoisting Nedir? - Kodlar\u0131n Gizemli D\u00fcnyas\u0131\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\"},\"datePublished\":\"2026-02-25T08:41:29+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/#breadcrumb\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Anasayfa\",\"item\":\"https:\/\/fatihsoysal.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Hoisting Nedir?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/\",\"name\":\"Fatihsoysal.com\",\"description\":\"Blog - Yaz\u0131l\u0131m D\u00fcnyas\u0131 Tecr\u00fcbelerim\",\"publisher\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/fatihsoysal.com\/blog\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"tr\"},{\"@type\":[\"Person\",\"Organization\"],\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\",\"name\":\"Fatih Soysal\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"tr\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/wp-content\/uploads\/2024\/04\/cropped-replicate-prediction-3kgg1hgjn5rgp0cf0p5tr0jw7w-1.png\",\"contentUrl\":\"https:\/\/fatihsoysal.com\/blog\/wp-content\/uploads\/2024\/04\/cropped-replicate-prediction-3kgg1hgjn5rgp0cf0p5tr0jw7w-1.png\",\"width\":512,\"height\":512,\"caption\":\"Fatih Soysal\"},\"logo\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/image\/\"},\"description\":\"Kullan\u0131m ve kodlama m\u00fckemmeliyetini odak alan uygulamalar olu\u015fturma deneyimine sahip, profesyonel olarak 15+ y\u0131l \u00fczeri deneyime sahip bir yaz\u0131l\u0131m m\u00fchendisi.\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/author\/fatihsoysal\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Hoisting Nedir? - Kodlar\u0131n Gizemli D\u00fcnyas\u0131","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/","og_locale":"tr_TR","og_type":"article","og_title":"Hoisting Nedir?","og_description":"JavaScript, web geli\u015ftirmenin temel ta\u015flar\u0131ndan biri olup, sundu\u011fu dinamik ve esnek yap\u0131yla milyonlarca uygulaman\u0131n kalbinde yer al\u0131r. Bu es","og_url":"https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/","og_site_name":"Kodlar\u0131n Gizemli D\u00fcnyas\u0131","article_published_time":"2026-02-25T08:41:29+00:00","author":"Fatih Soysal","twitter_card":"summary_large_image","twitter_misc":{"Yazan:":"Fatih Soysal","Tahmini okuma s\u00fcresi":"9 dakika"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/#article","isPartOf":{"@id":"https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/"},"author":{"name":"Fatih Soysal","@id":"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1"},"headline":"Hoisting Nedir?","datePublished":"2026-02-25T08:41:29+00:00","mainEntityOfPage":{"@id":"https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/"},"wordCount":1621,"commentCount":0,"publisher":{"@id":"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1"},"inLanguage":"tr","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/#respond"]}],"copyrightYear":"2026","copyrightHolder":{"@id":"https:\/\/fatihsoysal.com\/blog\/#organization"}},{"@type":"WebPage","@id":"https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/","url":"https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/","name":"Hoisting Nedir? - Kodlar\u0131n Gizemli D\u00fcnyas\u0131","isPartOf":{"@id":"https:\/\/fatihsoysal.com\/blog\/#website"},"datePublished":"2026-02-25T08:41:29+00:00","breadcrumb":{"@id":"https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/#breadcrumb"},"inLanguage":"tr","potentialAction":[{"@type":"ReadAction","target":["https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/fatihsoysal.com\/blog\/hoisting-nedir\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Anasayfa","item":"https:\/\/fatihsoysal.com\/blog\/"},{"@type":"ListItem","position":2,"name":"Hoisting Nedir?"}]},{"@type":"WebSite","@id":"https:\/\/fatihsoysal.com\/blog\/#website","url":"https:\/\/fatihsoysal.com\/blog\/","name":"Fatihsoysal.com","description":"Blog - Yaz\u0131l\u0131m D\u00fcnyas\u0131 Tecr\u00fcbelerim","publisher":{"@id":"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/fatihsoysal.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"tr"},{"@type":["Person","Organization"],"@id":"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1","name":"Fatih Soysal","image":{"@type":"ImageObject","inLanguage":"tr","@id":"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/image\/","url":"https:\/\/fatihsoysal.com\/blog\/wp-content\/uploads\/2024\/04\/cropped-replicate-prediction-3kgg1hgjn5rgp0cf0p5tr0jw7w-1.png","contentUrl":"https:\/\/fatihsoysal.com\/blog\/wp-content\/uploads\/2024\/04\/cropped-replicate-prediction-3kgg1hgjn5rgp0cf0p5tr0jw7w-1.png","width":512,"height":512,"caption":"Fatih Soysal"},"logo":{"@id":"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/image\/"},"description":"Kullan\u0131m ve kodlama m\u00fckemmeliyetini odak alan uygulamalar olu\u015fturma deneyimine sahip, profesyonel olarak 15+ y\u0131l \u00fczeri deneyime sahip bir yaz\u0131l\u0131m m\u00fchendisi.","url":"https:\/\/fatihsoysal.com\/blog\/author\/fatihsoysal\/"}]}},"yoast_meta":{"yoast_wpseo_title":"","yoast_wpseo_metadesc":"","yoast_wpseo_canonical":""},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/fatihsoysal.com\/blog\/wp-json\/wp\/v2\/posts\/40213","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fatihsoysal.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fatihsoysal.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fatihsoysal.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fatihsoysal.com\/blog\/wp-json\/wp\/v2\/comments?post=40213"}],"version-history":[{"count":1,"href":"https:\/\/fatihsoysal.com\/blog\/wp-json\/wp\/v2\/posts\/40213\/revisions"}],"predecessor-version":[{"id":40214,"href":"https:\/\/fatihsoysal.com\/blog\/wp-json\/wp\/v2\/posts\/40213\/revisions\/40214"}],"wp:attachment":[{"href":"https:\/\/fatihsoysal.com\/blog\/wp-json\/wp\/v2\/media?parent=40213"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fatihsoysal.com\/blog\/wp-json\/wp\/v2\/categories?post=40213"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fatihsoysal.com\/blog\/wp-json\/wp\/v2\/tags?post=40213"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}