{"id":6703,"date":"2024-12-15T20:15:17","date_gmt":"2024-12-15T17:15:17","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/2025te-javascript-roportaj-sorulari-ve-cevaplari\/"},"modified":"2024-12-15T20:15:17","modified_gmt":"2024-12-15T17:15:17","slug":"2025te-javascript-roportaj-sorulari-ve-cevaplari","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/2025te-javascript-roportaj-sorulari-ve-cevaplari\/","title":{"rendered":"2025’te JavaScript R\u00f6portaj Sorular\u0131 ve Cevaplar\u0131"},"content":{"rendered":"

<\/p>\n

2025’te JavaScript R\u00f6portaj Sorular\u0131 ve Cevaplar\u0131<\/p>\n

Merhaba! Fatih Soysal olarak, JavaScript alan\u0131nda uzmanla\u015fmak isteyenler i\u00e7in 2025 y\u0131l\u0131na y\u00f6nelik en \u00f6nemli 10 r\u00f6portaj sorusunu ve detayl\u0131 cevaplar\u0131n\u0131 derledim. Bu sorular, temel kavramlardan modern JavaScript \u00f6zelliklerine kadar geni\u015f bir yelpazeyi kapsamaktad\u0131r. Haz\u0131rsan\u0131z ba\u015flayal\u0131m!<\/p>\n

1. “this” anahtar kelimesi nedir ve nas\u0131l \u00e7al\u0131\u015f\u0131r?<\/h2>\n

JavaScript’te “this” anahtar kelimesi, fonksiyonun \u00e7a\u011f\u0131r\u0131m ba\u011flam\u0131na g\u00f6re de\u011fi\u015fen bir nesnedir. \u00d6rne\u011fin, bir nesne metodu i\u00e7inde kullan\u0131l\u0131rsa, “this” o nesneyi g\u00f6sterir. Ancak, global kapsamda veya bir fonksiyon i\u00e7inde kullan\u0131l\u0131rsa, “this” genellikle global nesneyi (pencere nesnesi taray\u0131c\u0131da) veya undefined’\u0131 (strict modda) g\u00f6sterir. “this” in davran\u0131\u015f\u0131n\u0131 anlamak, \u00f6zellikle prototip tabanl\u0131 miras\u0131n anla\u015f\u0131lmas\u0131 i\u00e7in olduk\u00e7a \u00f6nemlidir. Ayr\u0131ca, arrow fonksiyonlar\u0131nda “this” lexical olarak ba\u011flan\u0131r; yani, \u00e7evreleyen fonksiyonun “this” de\u011ferini miras al\u0131r.<\/p>\n

2. Closure (Kapan\u0131\u015f) nedir ve nas\u0131l kullan\u0131l\u0131r?<\/h2>\n

Closure, bir fonksiyonun tan\u0131mland\u0131\u011f\u0131 \u00e7evreleyen kapsamdaki de\u011fi\u015fkenlere eri\u015febilme \u00f6zelli\u011fidir. Bu, i\u00e7 i\u00e7e fonksiyonlar kullan\u0131larak sa\u011flan\u0131r. \u00d6rne\u011fin, i\u00e7 fonksiyon d\u0131\u015f fonksiyonun de\u011fi\u015fkenlerine eri\u015febilir, hatta d\u0131\u015f fonksiyon bittikten sonra bile. Closure, \u00f6zel de\u011fi\u015fkenler olu\u015fturmak, state (durum) y\u00f6netimi yapmak ve daha okunabilir kod yazmak i\u00e7in kullan\u0131l\u0131r. Ancak, dikkatli kullan\u0131lmal\u0131d\u0131r; \u00e7\u00fcnk\u00fc yanl\u0131\u015f kullan\u0131m bellek s\u0131z\u0131nt\u0131lar\u0131na neden olabilir.<\/p>\n

\nfunction d\u0131\u015fFonksiyon() {\n  let x = 10;\n  function i\u00e7Fonksiyon() {\n    console.log(x); \/\/ i\u00e7Fonksiyon x'e eri\u015febilir\n  }\n  return i\u00e7Fonksiyon;\n}\n\nlet myClosure = d\u0131\u015fFonksiyon();\nmyClosure(); \/\/ 10 yazd\u0131r\u0131r.\n<\/code><\/pre>\n
3.  Promise’ler ve Async\/Await nedir ve bunlar\u0131 ne zaman kullanmal\u0131y\u0131z?<\/h2>\n
Promise’ler, zaman i\u00e7inde sonu\u00e7lanan bir i\u015flemin (\u00f6rne\u011fin, a\u011f iste\u011fi) durumunu ve sonucunu temsil eden nesnelerdir.  Async\/await ise Promise’leri senkron bir \u015fekilde y\u00f6netmemizi sa\u011flayan bir s\u00f6zdizimi \u015feklidir.  Asenkron i\u015flemleri daha okunabilir ve daha kolay y\u00f6netilebilir hale getirirler.  A\u011f istekleri, veri taban\u0131na eri\u015fim gibi asenkron i\u015flemlerde kullan\u0131lmas\u0131 \u00f6nerilir. <\/p>\n
4.  Prototip tabanl\u0131 miras nedir ve nas\u0131l \u00e7al\u0131\u015f\u0131r?<\/h2>\n
JavaScript, prototip tabanl\u0131 bir miras sistemine sahiptir.  Her nesnenin bir prototipi vard\u0131r ve bu prototip ba\u015fka bir nesne olabilir.  Bir nesnenin bir \u00f6zelli\u011fe sahip olmad\u0131\u011f\u0131 zaman, JavaScript bu \u00f6zelli\u011fi prototipinde arar.  Bu \u015fekilde, bir nesne ba\u015fka bir nesnenin \u00f6zelliklerini miras alm\u0131\u015f olur.  Prototipler, kod tekrar\u0131n\u0131 azaltmak ve nesne hiyerar\u015fisi olu\u015fturmak i\u00e7in kullan\u0131l\u0131r.  Daha fazla bilgi i\u00e7in MDN d\u00f6k\u00fcmanlar\u0131na<\/a> g\u00f6z atabilirsiniz.<\/p>\n
5. Event Loop (Olay D\u00f6ng\u00fcs\u00fc) nedir ve nas\u0131l \u00e7al\u0131\u015f\u0131r?<\/h2>\n
JavaScript, tek i\u015f par\u00e7ac\u0131kl\u0131 bir dildir.  Ancak, asenkron i\u015flemleri y\u00f6netmek i\u00e7in event loop mekanizmas\u0131n\u0131 kullan\u0131r.  Event loop, call stack (\u00e7a\u011fr\u0131 y\u0131\u011f\u0131n\u0131) bo\u015fald\u0131\u011f\u0131nda, event queue (olay kuyru\u011fu)ndaki olaylar\u0131 al\u0131r ve bunlar\u0131 call stack’e ekler.  Bu sayede, asenkron i\u015flemler tamamland\u0131\u011f\u0131nda, ilgili callback fonksiyonlar\u0131 \u00e7al\u0131\u015ft\u0131r\u0131l\u0131r. Event Loop’un anla\u015f\u0131lmas\u0131, JavaScript’in asenkron yap\u0131s\u0131n\u0131 kavramak i\u00e7in olduk\u00e7a \u00f6nemlidir.<\/p>\n
6.  ES6 ve sonras\u0131nda gelen yeni \u00f6zellikler nelerdir ve bunlar\u0131 nas\u0131l kullan\u0131rs\u0131n\u0131z?<\/h2>\n
ES6 (ECMAScript 2015) ve sonras\u0131nda gelen s\u00fcr\u00fcmler, JavaScript diline bir\u00e7ok yeni \u00f6zellik eklemi\u015ftir.  Bunlar aras\u0131nda arrow fonksiyonlar, let ve const ile blok kapsaml\u0131 de\u011fi\u015fkenler, s\u0131n\u0131flar, templateliterals, map ve set gibi yeni veri yap\u0131lar\u0131,  module import\/export gibi \u00f6zellikler say\u0131labilir. Bu yeni \u00f6zellikler kodu daha okunabilir, daha s\u00fcrd\u00fcr\u00fclebilir ve daha g\u00fc\u00e7l\u00fc hale getirmektedir.  Bunlar\u0131n nas\u0131l kullan\u0131laca\u011f\u0131 konusunda \u00e7ok say\u0131da kaynak mevcuttur. JavaScript.com<\/a> sitesini ziyaret edebilirsiniz.<\/p>\n
7.  DOM manip\u00fclasyonu nedir ve nas\u0131l yap\u0131l\u0131r?<\/h2>\n
DOM (Document Object Model), bir HTML veya XML belgesini temsil eden bir a\u011fa\u00e7 yap\u0131s\u0131d\u0131r.  DOM manip\u00fclasyonu, JavaScript kullanarak bu a\u011fa\u00e7 yap\u0131s\u0131n\u0131 de\u011fi\u015ftirme i\u015flemidir.  \u00d6rne\u011fin,  eleman eklemek, silmek, i\u00e7eri\u011fini de\u011fi\u015ftirmek veya stilini de\u011fi\u015ftirmek i\u00e7in DOM manip\u00fclasyonu kullan\u0131l\u0131r.  jQuery gibi k\u00fct\u00fcphaneler DOM manip\u00fclasyonunu kolayla\u015ft\u0131r\u0131r, ancak temel JavaScript y\u00f6ntemlerini bilmek \u00f6nemlidir.<\/p>\n
8.  Callback, Promise ve Async\/Await aras\u0131ndaki farklar nelerdir?<\/h2>\n
Callback’ler, asenkron i\u015flemlerin sonu\u00e7lar\u0131n\u0131 i\u015flemek i\u00e7in kullan\u0131lan basit bir y\u00f6ntemdir.  Promise’ler, callback’lere g\u00f6re daha d\u00fczenli ve okunabilir bir yakla\u015f\u0131m sunar.  Async\/await ise Promise’leri daha senkron bir \u015fekilde y\u00f6netmemizi sa\u011flayan bir s\u00f6zdizimi \u015feklidir.  Genellikle Async\/Await, Promise’lerden daha temiz bir kod \u00fcretmeye yard\u0131mc\u0131 olur. Ancak, temelde ayn\u0131 asenkron i\u015flemleri farkl\u0131 s\u00f6zdizimi kullanarak y\u00f6netirler.  Se\u00e7iminizi, projenizin karma\u015f\u0131kl\u0131\u011f\u0131na ve ki\u015fisel tercihlerinize g\u00f6re yapmal\u0131s\u0131n\u0131z.<\/p>\n
9.  HTTP istekleri nas\u0131l yap\u0131l\u0131r ve nas\u0131l kullan\u0131l\u0131r?<\/h2>\n
JavaScript, fetch API’si veya XMLHttpRequest objesi kullan\u0131larak HTTP istekleri yapabilir. Bu istekler, sunuculardan veri almak veya sunuculara veri g\u00f6ndermek i\u00e7in kullan\u0131l\u0131r.  fetch, daha modern ve kullan\u0131m\u0131 daha kolay bir y\u00f6ntemdir.  HTTP isteklerini kullan\u0131rken, hata y\u00f6netimi ve g\u00fcvenlik \u00f6nlemleri al\u0131nmas\u0131 olduk\u00e7a \u00f6nemlidir.  HTTP durum kodlar\u0131n\u0131 (\u00f6rne\u011fin, 200 OK, 404 Not Found) anlamak da \u00f6nemlidir.<\/p>\n
10.  Kod optimizasyonu ve performans iyile\u015ftirme teknikleri nelerdir?<\/h2>\n
Kod optimizasyonu, uygulamalar\u0131n performans\u0131n\u0131 iyile\u015ftirmek i\u00e7in yap\u0131lan i\u015flemlerdir.  Bu i\u015flemler, gereksiz kodun temizlenmesi, verimli algoritmalar\u0131n kullan\u0131lmas\u0131,  DOM manip\u00fclasyonlar\u0131n\u0131n minimize edilmesi,  kodun \u00f6nbelle\u011fe al\u0131nmas\u0131 gibi bir\u00e7ok farkl\u0131 tekni\u011fi i\u00e7erir.   Performans sorunlar\u0131n\u0131 tespit etmek i\u00e7in profil olu\u015fturma ara\u00e7lar\u0131 kullan\u0131labilir.  Modern JavaScript’te, performans optimizasyonu, uygulaman\u0131n \u00f6l\u00e7eklenebilirli\u011fi ve kullan\u0131c\u0131 deneyimi a\u00e7\u0131s\u0131ndan kritik bir \u00f6neme sahiptir.<\/p>\n
Bu sorulara verdi\u011fim cevaplar genel bir bak\u0131\u015f sunmaktad\u0131r.  Her sorunun daha detayl\u0131 bir \u015fekilde ele al\u0131nabilece\u011fini unutmay\u0131n.  R\u00f6portajlarda, sorulara sadece do\u011fru cevap vermek de\u011fil, ayn\u0131 zamanda \u00e7\u00f6z\u00fcmleme ve problem \u00e7\u00f6zme yeteneklerinizi de g\u00f6stermeniz \u00f6nemlidir.  Ba\u015far\u0131lar dilerim!<\/p>\n
Daha fazla JavaScript \u00f6\u011frenmek veya di\u011fer konular hakk\u0131nda bilgi edinmek i\u00e7in fatihsoysal.com<\/a> sitesini ziyaret edebilirsiniz.<\/p>\n
#Etiketler: javascript, r\u00f6portaj sorular\u0131, cevaplar\u0131, 2025, programlama, web geli\u015ftirme, yaz\u0131l\u0131m m\u00fchendisi, this, closure, promise, async\/await, prototip, event loop, es6, dom manip\u00fclasyonu, http istekleri, kod optimizasyonu, fatih soysal<\/p>\n
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Fatih Soysal olarak, JavaScript alan\u0131nda uzmanla\u015fmak isteyenler i\u00e7in 2025 y\u0131l\u0131na y\u00f6nelik en \u00f6nemli 10 r\u00f6portaj sorusunu ve detayl\u0131 cevaplar\u0131n\u0131 derledim. Bu sorular, temel kavramlardan modern JavaScript \u00f6zelliklerine kadar geni\u015f bir yelpazeyi kapsamaktad\u0131r. Haz\u0131rsan\u0131z ba\u015flayal\u0131m!\" \/>\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\/2025te-javascript-roportaj-sorulari-ve-cevaplari\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"2025'te JavaScript R\u00f6portaj Sorular\u0131 ve Cevaplar\u0131\" \/>\n<meta property=\"og:description\" content=\"Merhaba! 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