{"id":30190,"date":"2025-09-24T18:00:25","date_gmt":"2025-09-24T15:00:25","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/javascript-dizileri-temelden-es6a-ustalik\/"},"modified":"2025-09-24T18:00:25","modified_gmt":"2025-09-24T15:00:25","slug":"javascript-dizileri-temelden-es6a-ustalik","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/javascript-dizileri-temelden-es6a-ustalik\/","title":{"rendered":"JavaScript Dizileri: Temelden ES6+\u2019a Ustal\u0131k"},"content":{"rendered":"

JavaScript Dizileri: Temelden ES6+\u2019a Ustal\u0131k<\/p>\n

Veri i\u015flemenin kalbi olan JavaScript dizileri, web geli\u015ftirmenin temel ta\u015flar\u0131ndan biridir. Bu makalede, JavaScript dizilerinin temellerinden modern ES6+ \u00f6zelliklerine kadar uzanan kapsaml\u0131 bir yolculu\u011fa \u00e7\u0131kaca\u011f\u0131z. Ba\u015flang\u0131\u00e7 seviyesinden ileri seviyeye kadar her a\u015famada pratik \u00f6rnekler ve ger\u00e7ek d\u00fcnya senaryolar\u0131yla, JavaScript dizilerine hakimiyetinizi art\u0131racaks\u0131n\u0131z. Karma\u015f\u0131k veri yap\u0131lar\u0131yla ba\u015fa \u00e7\u0131kma, performans\u0131 optimize etme ve modern JavaScript\u2019in g\u00fcc\u00fcnden faydalanma konusunda uzmanla\u015facaks\u0131n\u0131z.<\/p>\n

JavaScript Dizilerine Giri\u015f: Temel Kavramlar Nelerdir?<\/h2>\n

JavaScript dizileri, s\u0131ral\u0131 bir veri koleksiyonunu tutmak i\u00e7in kullan\u0131lan, olduk\u00e7a esnek ve g\u00fc\u00e7l\u00fc bir veri yap\u0131s\u0131d\u0131r. Bir dizi, say\u0131lar, dizeler, Booleans veya di\u011fer JavaScript nesneleri gibi farkl\u0131 veri tiplerini i\u00e7erebilir. Dizilerin elemanlar\u0131na s\u0131f\u0131r tabanl\u0131 indekslerle eri\u015filir; yani ilk eleman\u0131n indeksi 0’d\u0131r, ikincinin 1’dir, ve b\u00f6yle devam eder.<\/p>\n

\u00d6rne\u011fin, basit bir say\u0131 dizisi \u015fu \u015fekilde olu\u015fturulabilir:<\/p>\n

let sayilar = [10, 20, 30, 40, 50];<\/pre>\n
<\/code><\/p>\n
Bu dizinin ilk eleman\u0131na (10) sayilar[0]<\/code> ile, ikinci eleman\u0131na (20) sayilar[1]<\/code> ile eri\u015febiliriz.  Dizilerin uzunlu\u011fu, sayilar.length<\/code> \u00f6zelli\u011fi ile bulunabilir.  Bu \u00f6rnekte sayilar.length<\/code> 5 olacakt\u0131r.<\/p>\n
Diziler, web uygulamalar\u0131nda \u00e7ok \u00e7e\u015fitli g\u00f6revlerde kullan\u0131l\u0131r.  \u00d6rne\u011fin, bir web sayfas\u0131ndaki \u00fcr\u00fcn listesini, kullan\u0131c\u0131 yorumlar\u0131n\u0131 veya bir veritaban\u0131ndan al\u0131nan verileri saklamak i\u00e7in diziler kullan\u0131labilir.  Ancak, b\u00fcy\u00fck dizilerle \u00e7al\u0131\u015f\u0131rken performans sorunlar\u0131yla kar\u015f\u0131la\u015fmamak i\u00e7in dikkatli olmak \u00f6nemlidir.  B\u00fcy\u00fck verileri i\u015flemek i\u00e7in daha verimli y\u00f6ntemler (\u00f6rne\u011fin, Map<\/code> veya Set<\/code> nesneleri) tercih edilebilir.  Daha fazla bilgi i\u00e7in (https:\/\/fatihsoysal.com) inceleyebilirsiniz.<\/p>\n
JavaScript Dizilerinde Eleman Ekleme ve Silme: Nas\u0131l Yap\u0131l\u0131r?<\/h2>\n
JavaScript dizilerine eleman eklemek ve silmek i\u00e7in \u00e7e\u015fitli y\u00f6ntemler mevcuttur.  Temel y\u00f6ntemler push()<\/code>, pop()<\/code>, unshift()<\/code>, shift()<\/code>, splice()<\/code> ve concat()<\/code>'d\u0131r.<\/p>\n
push()<\/code> y\u00f6ntemi, dizinin sonuna bir veya daha fazla eleman ekler.  pop()<\/code> y\u00f6ntemi ise dizinin sonundaki eleman\u0131 siler ve silinen eleman\u0131 d\u00f6nd\u00fcr\u00fcr.  unshift()<\/code> y\u00f6ntemi, dizinin ba\u015f\u0131na bir veya daha fazla eleman eklerken, shift()<\/code> y\u00f6ntemi dizinin ba\u015f\u0131ndaki eleman\u0131 siler ve silinen eleman\u0131 d\u00f6nd\u00fcr\u00fcr.<\/p>\n
let meyveler = [\"elma\", \"armut\"];\n\nmeyveler.push(\"muz\"); \/\/ meyveler dizisi [\"elma\", \"armut\", \"muz\"] olur\nlet sonMeyve = meyveler.pop(); \/\/ sonMeyve \"muz\" olur, meyveler dizisi [\"elma\", \"armut\"] olur\n\nmeyveler.unshift(\"kiraz\"); \/\/ meyveler dizisi [\"kiraz\", \"elma\", \"armut\"] olur\nlet ilkMeyve = meyveler.shift(); \/\/ ilkMeyve \"kiraz\" olur, meyveler dizisi [\"elma\", \"armut\"] olur<\/pre>\n
<\/code><\/p>\n
splice()<\/code> y\u00f6ntemi, dizinin belirli bir konumuna eleman eklemek veya silmek i\u00e7in daha esnek bir yakla\u015f\u0131md\u0131r.  concat()<\/code> y\u00f6ntemi ise iki veya daha fazla diziyi birle\u015ftirerek yeni bir dizi olu\u015fturur.<\/p>\n
JavaScript Dizilerinde Arama ve Filtreleme: Pratik \u00d6rnekler<\/h2>\n
JavaScript dizilerinde belirli elemanlar\u0131 aramak ve filtrelemek i\u00e7in indexOf()<\/code>, lastIndexOf()<\/code>, includes()<\/code>, filter()<\/code> ve find()<\/code> metodlar\u0131 kullan\u0131l\u0131r.  indexOf()<\/code>, bir eleman\u0131n dizideki ilk indeksini d\u00f6nd\u00fcr\u00fcr, bulunmazsa -1 d\u00f6nd\u00fcr\u00fcr.  lastIndexOf()<\/code>, bir eleman\u0131n dizideki son indeksini d\u00f6nd\u00fcr\u00fcr.  includes()<\/code>, bir eleman\u0131n dizide olup olmad\u0131\u011f\u0131n\u0131 kontrol eder (Boolean de\u011fer d\u00f6nd\u00fcr\u00fcr).<\/p>\n
let sayilar = [10, 20, 30, 20, 40];\n\nlet indeks = sayilar.indexOf(20); \/\/ indeks 1 olur\nlet sonIndeks = sayilar.lastIndexOf(20); \/\/ sonIndeks 3 olur\nlet iceriyorMu = sayilar.includes(50); \/\/ iceriyorMu false olur<\/pre>\n
<\/code><\/p>\n
filter()<\/code> y\u00f6ntemi, bir ko\u015fulu sa\u011flayan elemanlardan olu\u015fan yeni bir dizi olu\u015fturur.  find()<\/code> y\u00f6ntemi ise, bir ko\u015fulu sa\u011flayan ilk eleman\u0131 d\u00f6nd\u00fcr\u00fcr.  Bulunamazsa undefined<\/code> d\u00f6nd\u00fcr\u00fcr.<\/p>\n
let sayilar = [10, 20, 30, 40, 50];\n\nlet ciftSayilar = sayilar.filter(sayi => sayi % 2 === 0); \/\/ ciftSayilar [20, 40] olur\nlet ilkCiftSayi = sayilar.find(sayi => sayi % 2 === 0); \/\/ ilkCiftSayi 20 olur<\/pre>\n
<\/code><\/p>\n
Modern ES6+ Dizileri: Map, Reduce, ve Daha Fazlas\u0131<\/h2>\n
ES6+ ile birlikte JavaScript'e eklenen map()<\/code>, reduce()<\/code>, forEach()<\/code>, some()<\/code>, ve every()<\/code> gibi y\u00fcksek seviyeli fonksiyonlar, diziler \u00fczerinde daha temiz ve okunabilir kod yazmay\u0131 sa\u011flar.<\/p>\n
map()<\/code>, dizinin her bir eleman\u0131na bir fonksiyon uygulayarak yeni bir dizi olu\u015fturur. reduce()<\/code>, dizinin elemanlar\u0131n\u0131 birle\u015ftirip tek bir de\u011fer d\u00f6nd\u00fcr\u00fcr.  forEach()<\/code>, dizinin her bir eleman\u0131na bir fonksiyon uygular, ancak yeni bir dizi d\u00f6nd\u00fcrmez.  some()<\/code>, dizide en az bir eleman\u0131n ko\u015fulu sa\u011flamas\u0131n\u0131 kontrol eder. every()<\/code>, dizideki t\u00fcm elemanlar\u0131n ko\u015fulu sa\u011flamas\u0131n\u0131 kontrol eder.<\/p>\n
let sayilar = [1, 2, 3, 4, 5];\n\nlet kareleri = sayilar.map(sayi => sayi * sayi); \/\/ kareleri [1, 4, 9, 16, 25] olur\nlet toplam = sayilar.reduce((toplam, sayi) => toplam + sayi, 0); \/\/ toplam 15 olur\nsayilar.forEach(sayi => console.log(sayi)); \/\/ Her say\u0131y\u0131 ayr\u0131 ayr\u0131 konsola yazar\nlet varMi = sayilar.some(sayi => sayi > 4); \/\/ varMi true olur\nlet hepsiMi = sayilar.every(sayi => sayi > 0); \/\/ hepsiMi true olur<\/pre>\n
<\/code><\/p>\n
JavaScript Dizilerinde Performans Optimizasyonu: \u0130pu\u00e7lar\u0131 ve P\u00fcf Noktalar\u0131<\/h2>\n
B\u00fcy\u00fck dizilerle \u00e7al\u0131\u015f\u0131rken performans \u00f6nemlidir.  Diziler \u00fczerinde i\u015flem yaparken, a\u015fa\u011f\u0131daki ipu\u00e7lar\u0131na dikkat etmek performans\u0131 art\u0131rabilir:<\/p>\n
* forEach()<\/code> yerine for<\/code> d\u00f6ng\u00fcs\u00fc:<\/strong>  Baz\u0131 durumlarda, for<\/code> d\u00f6ng\u00fcs\u00fc forEach()<\/code>'dan daha h\u0131zl\u0131 olabilir.
\n* splice()<\/code> kullan\u0131m\u0131n\u0131 s\u0131n\u0131rland\u0131rmak:<\/strong> splice()<\/code> y\u00f6ntemi, dizinin elemanlar\u0131n\u0131 yeniden indeksledi\u011fi i\u00e7in performans\u0131 d\u00fc\u015f\u00fcrebilir.  M\u00fcmk\u00fcnse, alternatif y\u00f6ntemler tercih edilmelidir.
\n* Kopyalama yerine referans kullanmak:<\/strong>  Dizileri kopyalamak yerine, m\u00fcmk\u00fcn oldu\u011funca referans kullanmak bellek kullan\u0131m\u0131n\u0131 azaltabilir.
\n* Asenkron i\u015flemler:<\/strong>  B\u00fcy\u00fck diziler \u00fczerinde i\u015flem yaparken, asenkron i\u015flemler kullanmak uygulaman\u0131n donmas\u0131n\u0131 \u00f6nleyebilir.<\/p>\n
Ger\u00e7ek D\u00fcnya Senaryolar\u0131: Vaka Analizleri<\/h2>\n
JavaScript dizileri, bir\u00e7ok ger\u00e7ek d\u00fcnya senaryosunda kullan\u0131l\u0131r.  \u00d6rne\u011fin:<\/p>\n
* E-ticaret web siteleri:<\/strong> \u00dcr\u00fcn listesini, al\u0131\u015fveri\u015f sepetini ve kullan\u0131c\u0131 yorumlar\u0131n\u0131 saklamak i\u00e7in kullan\u0131l\u0131r.
\n* Sosyal medya platformlar\u0131:<\/strong> Kullan\u0131c\u0131 g\u00f6nderilerini, arkada\u015f listelerini ve bildirimleri saklamak i\u00e7in kullan\u0131l\u0131r.
\n* Veri g\u00f6rselle\u015ftirme ara\u00e7lar\u0131:<\/strong> Verileri i\u015flemek ve grafikleri olu\u015fturmak i\u00e7in kullan\u0131l\u0131r.<\/p>\n
\u00d6rne\u011fin, bir e-ticaret sitesindeki \u00fcr\u00fcn listesini temsil eden bir dizi \u015fu \u015fekilde olabilir:<\/p>\n
let urunler = [\n  { id: 1, ad: \"\u00dcr\u00fcn 1\", fiyat: 100 },\n  { id: 2, ad: \"\u00dcr\u00fcn 2\", fiyat: 200 },\n  { id: 3, ad: \"\u00dcr\u00fcn 3\", fiyat: 300 }\n];<\/pre>\n
<\/code><\/p>\n
Bu dizi \u00fczerinde filter()<\/code> y\u00f6ntemi kullan\u0131larak, belirli bir fiyat aral\u0131\u011f\u0131ndaki \u00fcr\u00fcnler bulunabilir.  map()<\/code> y\u00f6ntemi kullan\u0131larak, \u00fcr\u00fcnlerin adlar\u0131 ve fiyatlar\u0131 farkl\u0131 bir formatta g\u00f6sterilebilir.<\/p>\n
\u00d6\u011frenme Yol Haritas\u0131<\/h2>\n
Yeni Ba\u015flayan:<\/strong> Temel dizi olu\u015fturma, elemanlara eri\u015fim, length<\/code> \u00f6zelli\u011fi, push()<\/code>, pop()<\/code>, unshift()<\/code>, shift()<\/code> metodlar\u0131.<\/p>\n
Orta Seviye:<\/strong> indexOf()<\/code>, lastIndexOf()<\/code>, includes()<\/code>, splice()<\/code>, concat()<\/code>, filter()<\/code>, find()<\/code>, map()<\/code> metodlar\u0131,  daha karma\u015f\u0131k dizi manip\u00fclasyonlar\u0131.<\/p>\n
\u0130leri Seviye:<\/strong> reduce()<\/code>, forEach()<\/code>, some()<\/code>, every()<\/code>, performans optimizasyonu, asenkron i\u015flemler,  karma\u015f\u0131k veri yap\u0131lar\u0131 ile \u00e7al\u0131\u015fma.<\/p>\n
Sonu\u00e7<\/h2>\n
Bu makalede, JavaScript dizilerinin temellerinden modern ES6+ \u00f6zelliklerine kadar geni\u015f bir yelpazeyi ele ald\u0131k.  Ger\u00e7ek d\u00fcnya senaryolar\u0131 ve pratik \u00f6rneklerle, JavaScript dizilerine olan hakimiyetinizi \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131raca\u011f\u0131n\u0131za inan\u0131yoruz.  Daha fazla derinlemesine bilgi ve ileri seviye teknikler i\u00e7in (https:\/\/fatihsoysal.com) ziyaret edebilirsiniz.<\/p>\n
S\u0131k\u00e7a Sorulan Sorular<\/h3>\n
* Diziler ile nesneler aras\u0131ndaki fark nedir?<\/strong> Diziler s\u0131ral\u0131 veri koleksiyonlar\u0131d\u0131r, nesneler ise anahtar-de\u011fer \u00e7iftlerinden olu\u015fan veri yap\u0131lar\u0131d\u0131r.
\n* B\u00fcy\u00fck dizilerle \u00e7al\u0131\u015f\u0131rken performans\u0131 nas\u0131l optimize edebilirim?<\/strong>  for<\/code> d\u00f6ng\u00fcleri, splice()<\/code> kullan\u0131m\u0131n\u0131 s\u0131n\u0131rland\u0131rma, asenkron i\u015flemler ve verimli algoritmalar kullanarak.
\n* map()<\/code> ve forEach()<\/code> aras\u0131ndaki fark nedir?<\/strong> map()<\/code> yeni bir dizi d\u00f6nd\u00fcr\u00fcrken, forEach()<\/code> d\u00f6nd\u00fcrmez.
\n* filter()<\/code> ve find()<\/code> aras\u0131ndaki fark nedir?<\/strong> filter()<\/code> bir ko\u015fulu sa\u011flayan t\u00fcm elemanlar\u0131 d\u00f6nd\u00fcr\u00fcrken, find()<\/code> sadece ilkini d\u00f6nd\u00fcr\u00fcr.
\n* JavaScript dizilerinde null veya undefined de\u011ferleri nas\u0131l ele alabilirim?<\/strong>  Ko\u015fullu ifadeler kullanarak veya filter()<\/code> gibi metodlarla bu de\u011ferleri filtreleyerek.<\/p>\n
Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"JavaScript Dizileri: Temelden ES6+\u2019a Ustal\u0131k Veri i\u015flemenin kalbi olan JavaScript dizileri, web geli\u015ftirmenin temel ta\u015flar\u0131ndan biridir. Bu makalede,…","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":[129],"tags":[],"class_list":{"0":"post-30190","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-javascript","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"\nJavaScript Dizileri: Temelden ES6+\u2019a Ustal\u0131k<\/title>\n<meta name=\"description\" content=\"Veri i\u015flemenin kalbi olan JavaScript dizileri, web geli\u015ftirmenin temel ta\u015flar\u0131ndan biridir. Bu makalede, JavaScript dizilerinin temellerinden modern ES6+ \u00f6zelliklerine kadar uzanan kapsaml\u0131 bir yolculu\u011fa \u00e7\u0131kaca\u011f\u0131z. Ba\u015flang\u0131\u00e7 seviyesinden ileri seviyeye kadar her a\u015famada pratik \u00f6rnekler ve ger\u00e7ek d\u00fcnya senaryolar\u0131yla, JavaScript dizilerine hakimiyetinizi art\u0131racaks\u0131n\u0131z. Karma\u015f\u0131k veri yap\u0131lar\u0131yla ba\u015fa \u00e7\u0131kma, performans\u0131 optimize etme ve modern JavaScript\u2019in g\u00fcc\u00fcnden faydalanma konusunda uzmanla\u015facaks\u0131n\u0131z.\" \/>\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\/javascript-dizileri-temelden-es6a-ustalik\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JavaScript Dizileri: Temelden ES6+\u2019a Ustal\u0131k\" \/>\n<meta property=\"og:description\" content=\"Veri i\u015flemenin kalbi olan JavaScript dizileri, web geli\u015ftirmenin temel ta\u015flar\u0131ndan biridir. Bu makalede, JavaScript dizilerinin temellerinden modern ES6+ \u00f6zelliklerine kadar uzanan kapsaml\u0131 bir yolculu\u011fa \u00e7\u0131kaca\u011f\u0131z. 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