{"id":3794,"date":"2024-11-13T12:45:15","date_gmt":"2024-11-13T09:45:15","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/javascriptin-gizli-yuzu-15-sasirtici-ozellik\/"},"modified":"2024-11-13T12:45:15","modified_gmt":"2024-11-13T09:45:15","slug":"javascriptin-gizli-yuzu-15-sasirtici-ozellik","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/javascriptin-gizli-yuzu-15-sasirtici-ozellik\/","title":{"rendered":"JavaScript’in Gizli Y\u00fcz\u00fc: 15 \u015ea\u015f\u0131rt\u0131c\u0131 \u00d6zellik"},"content":{"rendered":"

JavaScript’in Gizli Y\u00fcz\u00fc: 15 \u015ea\u015f\u0131rt\u0131c\u0131 \u00d6zellik<\/p>\n

JavaScript, web geli\u015ftirmenin olmazsa olmaz dillerinden biri olarak geni\u015f \u00e7apta kullan\u0131l\u0131yor. Ancak bu dilin, yeni ba\u015flayanlar\u0131 \u015fa\u015f\u0131rtabilecek bir\u00e7ok gizli \u00f6zelli\u011fi ve tuhafl\u0131\u011f\u0131 var. Bu makalede, JavaScript d\u00fcnyas\u0131nda size ilgin\u00e7 bak\u0131\u015f a\u00e7\u0131lar\u0131 kazand\u0131racak 15 \u015fa\u015f\u0131rt\u0131c\u0131 \u00f6zelli\u011fi ele alaca\u011f\u0131z. Haz\u0131r olun, zihninizdeki JavaScript anlay\u0131\u015f\u0131n\u0131z\u0131 alt \u00fcst edece\u011fiz!<\/p>\n

1. Say\u0131lar ile Kar\u015f\u0131la\u015fma: NaN ve Infinity<\/h2>\n

JavaScript’te say\u0131larla \u00e7al\u0131\u015f\u0131rken, NaN ve Infinity gibi \u00f6zel de\u011ferlerle kar\u015f\u0131la\u015fabilirsiniz. NaN (Not a Number), matematiksel bir i\u015flem sonucunda ge\u00e7ersiz bir say\u0131 elde edildi\u011finde ortaya \u00e7\u0131kar. \u00d6rne\u011fin, “0\/0” i\u015fleminin sonucu NaN’dir. Infinity ise sonsuzlu\u011fu temsil eder ve bir say\u0131n\u0131n s\u0131f\u0131ra b\u00f6l\u00fcnmesi sonucunda elde edilebilir.<\/p>\n

2. Kar\u015f\u0131la\u015ft\u0131rma Operat\u00f6rleri: == vs. ===<\/h2>\n

JavaScript’te iki de\u011feri kar\u015f\u0131la\u015ft\u0131rmak i\u00e7in kullan\u0131lan iki farkl\u0131 operat\u00f6r vard\u0131r: == (e\u015fittir) ve === (kesin e\u015fittir). == operat\u00f6r\u00fc, de\u011ferleri kar\u015f\u0131la\u015ft\u0131rd\u0131ktan \u00f6nce tiplerini d\u00f6n\u00fc\u015ft\u00fcr\u00fcrken, === operat\u00f6r\u00fc tip d\u00f6n\u00fc\u015ft\u00fcrme yapmaz. Bu nedenle, “1 == “1” ” do\u011fru, “1 === “1” ” ise yanl\u0131\u015ft\u0131r.<\/p>\n

3. Fonksiyon Kapsam\u0131: Hoisting<\/h2>\n

JavaScript’te, fonksiyonlar ve de\u011fi\u015fkenler, kodun y\u00fcr\u00fct\u00fclmesi s\u0131ras\u0131nda tan\u0131mland\u0131klar\u0131 yere de\u011fil, kodun en \u00fcst\u00fcne “hoisting” edilir. Bu, bir fonksiyonu veya de\u011fi\u015fkeni tan\u0131mlamadan \u00f6nce kullanabilece\u011finiz anlam\u0131na gelir. Ancak, bu \u00f6zellik baz\u0131 beklenmedik davran\u0131\u015flara yol a\u00e7abilir. \u00d6rne\u011fin, bir de\u011fi\u015fkeni \u00f6nce tan\u0131mlamadan \u00f6nce kullan\u0131rsan\u0131z, de\u011feri “undefined” olacakt\u0131r.<\/p>\n

4. Nesnelerin Gizli Y\u00fcz\u00fc: Prototype Chain<\/h2>\n

JavaScript’te nesneler, prototiplerin zincirine dayanan bir hiyerar\u015fik yap\u0131ya sahiptir. Her nesnenin bir prototipi vard\u0131r ve bu prototipin de bir prototipi olabilir. Bu sayede, bir nesnede olmayan bir \u00f6zellik, prototip zincirinde aran\u0131r. \u00d6rne\u011fin, bir dizi \u00fczerinde kullan\u0131lan “forEach” y\u00f6ntemi, Array nesnesinin prototipinde tan\u0131mlan\u0131r.<\/p>\n

5. Aray\u00fcz\u00fcn Alt\u0131nda Yatan Ger\u00e7ek: DOM<\/h2>\n

JavaScript’te web sayfalar\u0131 ile etkile\u015fim kurmak i\u00e7in DOM (Document Object Model) kullan\u0131l\u0131r. DOM, HTML belgesini bir nesne hiyerar\u015fisi olarak temsil eder. Bu sayede, JavaScript ile HTML \u00f6\u011felerine eri\u015febilir, \u00f6zelliklerini de\u011fi\u015ftirebilir ve yeni \u00f6\u011feler ekleyebiliriz.<\/p>\n

6. JavaScript’in G\u00fc\u00e7l\u00fc Y\u00f6n\u00fc: Closure<\/h2>\n

Closure, JavaScript’te \u00f6nemli bir konudur. Bir closure, bir fonksiyonun d\u0131\u015f d\u00fcnyadan ba\u011f\u0131ms\u0131z olarak, kapsayan fonksiyonun de\u011fi\u015fkenlerine eri\u015febilme yetene\u011fidir. Bu sayede, fonksiyonlar kendi \u00f6zel durumlar\u0131n\u0131 koruyabilir ve daha esnek davranabilirler. \u00d6rne\u011fin, closure’lar \u00f6zel de\u011fi\u015fkenler olu\u015fturmak, callback fonksiyonlar\u0131 tan\u0131mlamak ve anonim fonksiyonlar\u0131 kullanmak i\u00e7in kullan\u0131l\u0131r.<\/p>\n

7. Array’lerin Gizli Yetene\u011fi: map, filter ve reduce<\/h2>\n

JavaScript’te array’ler \u00fczerinde i\u015flem yapmak i\u00e7in kullan\u0131lan bir\u00e7ok yerle\u015fik fonksiyon vard\u0131r. Bunlardan baz\u0131lar\u0131, map, filter ve reduce’tir. Map, array’in her bir eleman\u0131na belirli bir fonksiyon uygular ve yeni bir array olu\u015fturur. Filter, belirli bir ko\u015fulu sa\u011flayan elemanlar\u0131 i\u00e7eren bir array d\u00f6nd\u00fcr\u00fcr. Reduce ise array’in t\u00fcm elemanlar\u0131n\u0131 birle\u015ftirerek tek bir de\u011fer d\u00f6nd\u00fcr\u00fcr.<\/p>\n

8. “this” anahtar s\u00f6zc\u00fc\u011f\u00fcn\u00fcn gizemleri<\/h2>\n

JavaScript’te “this” anahtar s\u00f6zc\u00fc\u011f\u00fc, fonksiyon \u00e7a\u011fr\u0131l\u0131\u015f \u015fekline ba\u011fl\u0131 olarak farkl\u0131 de\u011ferler alabilir. Fonksiyon normal bir \u015fekilde \u00e7a\u011fr\u0131l\u0131rsa, “this” global nesneye i\u015faret eder. Bir nesnenin metodu olarak \u00e7a\u011fr\u0131l\u0131rsa, “this” o nesneye i\u015faret eder. “this” ile ilgili daha detayl\u0131 bilgiler i\u00e7in fatihsoysal.com<\/a> adresindeki yaz\u0131y\u0131 inceleyebilirsiniz.<\/p>\n

9. Callback’ler ve Event Handling<\/h2>\n

JavaScript’te, fonksiyonlar\u0131 arg\u00fcman olarak ge\u00e7mek ve daha sonra bu fonksiyonlar\u0131 \u00e7a\u011f\u0131rmak i\u00e7in callback’ler kullan\u0131l\u0131r. Bu, asenkron i\u015flemlerle \u00e7al\u0131\u015fmak i\u00e7in kullan\u0131l\u0131r. \u00d6rne\u011fin, bir d\u00fc\u011fmeye t\u0131kland\u0131\u011f\u0131nda bir fonksiyonu \u00e7a\u011f\u0131rmak i\u00e7in event handling mekanizmas\u0131 callback’ler kullan\u0131r. Callback’ler, asenkron programlamada \u00f6nemli bir rol oynar ve uygulaman\u0131n farkl\u0131 par\u00e7alar\u0131n\u0131 birbirine ba\u011flamaya yard\u0131mc\u0131 olur.<\/p>\n

10. Asenkron Programlama: Promises ve async\/await<\/h2>\n

JavaScript’te, a\u011f istekleri gibi baz\u0131 i\u015flemler zaman al\u0131c\u0131 olabilir. Bu i\u015flemleri i\u015flemek i\u00e7in asenkron programlama kullan\u0131l\u0131r. Promises, asenkron i\u015flemlerin sonucunu temsil eder ve i\u015flem tamamland\u0131\u011f\u0131nda bir de\u011fer veya hata d\u00f6nd\u00fcr\u00fcr. Async\/await s\u00f6zdizimi, asenkron i\u015flemleri senkron kod gibi yazmam\u0131z\u0131 sa\u011flar.<\/p>\n

11. JavaScript’in G\u00f6z Al\u0131c\u0131 Y\u00fcz\u00fc: AJAX<\/h2>\n

AJAX (Asynchronous JavaScript and XML), web sunucular\u0131 ile arka planda etkile\u015fim kurmam\u0131z\u0131 sa\u011flayan bir tekniktir. AJAX ile, sunucudan veri alabiliriz ve bu verileri web sayfam\u0131zda g\u00fcncelleyebiliriz. Bu sayede, kullan\u0131c\u0131lar\u0131n web sayfalar\u0131n\u0131 yeniden y\u00fcklemeden veri al\u0131p g\u00fcncellemesini sa\u011flar.<\/p>\n

12. \u015ea\u015f\u0131rt\u0131c\u0131 Bir Hata: ‘use strict’<\/h2>\n

‘use strict’ direktifi, JavaScript kodunun daha kat\u0131 bir \u015fekilde \u00e7al\u0131\u015fmas\u0131n\u0131 sa\u011flar. Bu direktif, JavaScript’in baz\u0131 esnek \u00f6zelliklerini devre d\u0131\u015f\u0131 b\u0131rak\u0131r ve kodun daha g\u00fcvenli ve hatas\u0131z olmas\u0131n\u0131 sa\u011flar.<\/p>\n

13. JSON: Veri De\u011fi\u015fiminin Anahtar\u0131<\/h2>\n

JSON (JavaScript Object Notation), web uygulamalar\u0131 aras\u0131nda veri al\u0131\u015fveri\u015fi i\u00e7in kullan\u0131lan pop\u00fcler bir formatt\u0131r. JSON, JavaScript nesneleri ile benzer bir s\u00f6zdizimi kullan\u0131r, bu da JavaScript ile kolayca i\u015flenebilir.<\/p>\n

14. Fonksiyon ifadeleri ve fonksiyon beyanlar\u0131<\/h2>\n

JavaScript’te fonksiyonlar, iki \u015fekilde tan\u0131mlanabilir: Fonksiyon beyanlar\u0131 ve fonksiyon ifadeleri. Fonksiyon beyanlar\u0131, fonksiyonun tan\u0131m\u0131n\u0131 kodun \u00f6n\u00fcne hoist eder, bu da fonksiyonu tan\u0131mlamadan \u00f6nce kullanmam\u0131z\u0131 sa\u011flar. Fonksiyon ifadeleri ise bir de\u011fi\u015fkene atan\u0131r ve bu de\u011fi\u015fkeni kullanarak \u00e7a\u011f\u0131r\u0131l\u0131r.<\/p>\n

15. Mod\u00fcler JavaScript: CommonJS ve ES Modules<\/h2>\n

JavaScript’te kodun daha organize ve yeniden kullan\u0131labilir olmas\u0131 i\u00e7in mod\u00fcler programlama kullan\u0131l\u0131r. CommonJS ve ES Modules, kodun farkl\u0131 dosyalara ayr\u0131lmas\u0131n\u0131 ve bu dosyalar\u0131 gerekti\u011finde i\u00e7e aktar\u0131lmas\u0131n\u0131 sa\u011flayan iki farkl\u0131 mod\u00fcl sistemi.<\/p>\n

Sonu\u00e7<\/h2>\n

JavaScript, web geli\u015ftirmede yayg\u0131n olarak kullan\u0131lan bir dil olmas\u0131na ra\u011fmen, bir\u00e7ok gizli \u00f6zelli\u011fe ve tuhafl\u0131\u011fa sahiptir. Bu makalede, JavaScript’in \u015fa\u015f\u0131rt\u0131c\u0131 15 \u00f6zelli\u011fini ele ald\u0131k. Bu \u00f6zellikleri anlamak, JavaScript’in \u00e7al\u0131\u015fma \u015feklini daha iyi anlaman\u0131za ve daha etkili ve g\u00fcvenli kod yazman\u0131za yard\u0131mc\u0131 olacakt\u0131r.<\/p>\n

#Etiketler: JavaScript, NaN, Infinity, kar\u015f\u0131la\u015ft\u0131rma operat\u00f6rleri, ==, ===, hoisting, prototype chain, DOM, closure, array, map, filter, reduce, this, callback, event handling, asenkron programlama, promises, async\/await, AJAX, ‘use strict’, JSON, fonksiyon beyanlar\u0131, fonksiyon ifadeleri, mod\u00fcler JavaScript, CommonJS, ES Modules<\/p>\n","protected":false},"excerpt":{"rendered":"JavaScript’in Gizli Y\u00fcz\u00fc: 15 \u015ea\u015f\u0131rt\u0131c\u0131 \u00d6zellik JavaScript, web geli\u015ftirmenin olmazsa olmaz dillerinden biri olarak geni\u015f \u00e7apta kullan\u0131l\u0131yor. Ancak…","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-3794","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-genel","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"\nJavaScript'in Gizli Y\u00fcz\u00fc: 15 \u015ea\u015f\u0131rt\u0131c\u0131 \u00d6zellik<\/title>\n<meta name=\"description\" content=\"JavaScript, web geli\u015ftirmenin olmazsa olmaz dillerinden biri olarak geni\u015f \u00e7apta kullan\u0131l\u0131yor. Ancak bu dilin, yeni ba\u015flayanlar\u0131 \u015fa\u015f\u0131rtabilecek bir\u00e7ok gizli \u00f6zelli\u011fi ve tuhafl\u0131\u011f\u0131 var. Bu makalede, JavaScript d\u00fcnyas\u0131nda size ilgin\u00e7 bak\u0131\u015f a\u00e7\u0131lar\u0131 kazand\u0131racak 15 \u015fa\u015f\u0131rt\u0131c\u0131 \u00f6zelli\u011fi ele alaca\u011f\u0131z. Haz\u0131r olun, zihninizdeki JavaScript anlay\u0131\u015f\u0131n\u0131z\u0131 alt \u00fcst edece\u011fiz!\" \/>\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-yuzu-15-sasirtici-ozellik\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JavaScript'in Gizli Y\u00fcz\u00fc: 15 \u015ea\u015f\u0131rt\u0131c\u0131 \u00d6zellik\" \/>\n<meta property=\"og:description\" content=\"JavaScript, web geli\u015ftirmenin olmazsa olmaz dillerinden biri olarak geni\u015f \u00e7apta kullan\u0131l\u0131yor. Ancak bu dilin, yeni ba\u015flayanlar\u0131 \u015fa\u015f\u0131rtabilecek bir\u00e7ok gizli \u00f6zelli\u011fi ve tuhafl\u0131\u011f\u0131 var. Bu makalede, JavaScript d\u00fcnyas\u0131nda size ilgin\u00e7 bak\u0131\u015f a\u00e7\u0131lar\u0131 kazand\u0131racak 15 \u015fa\u015f\u0131rt\u0131c\u0131 \u00f6zelli\u011fi ele alaca\u011f\u0131z. 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