{"id":3625,"date":"2024-11-11T18:30:20","date_gmt":"2024-11-11T15:30:20","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/20-her-javascript-gelistiricisinin-bilmesi-gereken-ipucu\/"},"modified":"2024-11-11T18:30:20","modified_gmt":"2024-11-11T15:30:20","slug":"20-her-javascript-gelistiricisinin-bilmesi-gereken-ipucu","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/20-her-javascript-gelistiricisinin-bilmesi-gereken-ipucu\/","title":{"rendered":"20 Her JavaScript Geli\u015ftiricisinin Bilmesi Gereken \u0130pucu"},"content":{"rendered":"

20 Her JavaScript Geli\u015ftiricisinin Bilmesi Gereken \u0130pucu<\/p>\n

JavaScript, web geli\u015ftirmenin olmazsa olmaz dili. G\u00fcn\u00fcm\u00fczde hemen her web sitesi ve web uygulamas\u0131 JavaScript’i kullan\u0131yor. Bu dil, web sayfalar\u0131na interaktiflik ve dinamiklik kazand\u0131rmak i\u00e7in olmazsa olmaz. Ancak, JavaScript’in sundu\u011fu t\u00fcm olanaklar\u0131 kullanabilmek i\u00e7in, baz\u0131 temel ipu\u00e7lar\u0131n\u0131 bilmek \u015fart. Bu makalede, her JavaScript geli\u015ftiricisinin bilmesi gereken 20 ipucu sizlerle payla\u015f\u0131yorum.<\/p>\n

1. De\u011fi\u015fken Bildirimi<\/h2>\n

JavaScript’te de\u011fi\u015fkenler `let`, `const` ve `var` anahtar s\u00f6zc\u00fckleri ile bildirilebilir. `let` ile bildirilen de\u011fi\u015fkenler yeniden atanabilir, `const` ile bildirilen de\u011fi\u015fkenler ise de\u011fi\u015fmez. `var` ise, art\u0131k pek tercih edilmeyen eski bir y\u00f6ntemdir. `var` ile bildirilen de\u011fi\u015fkenler, fonksiyon kapsam\u0131nda ge\u00e7erlidir ve global kapsamda kullan\u0131lmalar\u0131ndan ka\u00e7\u0131n\u0131lmal\u0131d\u0131r. <\/p>\n

\nlet name = \"Fatih\"; \/\/ De\u011fi\u015fken yeniden atanabilir\nconst age = 30; \/\/ De\u011fi\u015fken sabittir\nvar job = \"Software Engineer\"; \/\/ Eski y\u00f6ntem, kullan\u0131lmamas\u0131 \u00f6nerilir\n<\/code><\/pre>\n
2. Fonksiyon Bildirimi<\/h2>\n
JavaScript’te fonksiyonlar, kod bloklar\u0131n\u0131n tekrar kullan\u0131labilir hale getirilmesini sa\u011flar. Fonksiyonlar, `function` anahtar s\u00f6zc\u00fc\u011f\u00fc ile bildirilir ve parantezler aras\u0131nda parametreler al\u0131r. Fonksiyonlar, geri d\u00f6n\u00fc\u015f de\u011ferleri d\u00f6nd\u00fcrebilir.  <\/p>\n
\nfunction sum(a, b) {\n  return a + b;\n}\n\nconsole.log(sum(2, 3)); \/\/ \u00c7\u0131kt\u0131: 5\n<\/code><\/pre>\n
3. Arrow Fonksiyonlar\u0131<\/h2>\n
Arrow fonksiyonlar\u0131, k\u0131sa ve \u00f6z fonksiyonlar tan\u0131mlamam\u0131za olanak tan\u0131r. Bu fonksiyonlar `=>` ile tan\u0131mlan\u0131r. Arrow fonksiyonlar\u0131nda `this` ba\u011flam\u0131, fonksiyonun tan\u0131mland\u0131\u011f\u0131 yerde sabitlenir. <\/p>\n
\nconst sum = (a, b) => a + b;\n\nconsole.log(sum(2, 3)); \/\/ \u00c7\u0131kt\u0131: 5\n<\/code><\/pre>\n
4. `forEach` D\u00f6ng\u00fcs\u00fc<\/h2>\n
`forEach` d\u00f6ng\u00fcs\u00fc, dizi elemanlar\u0131n\u0131 s\u0131rayla yinelemek i\u00e7in kullan\u0131l\u0131r.  `forEach` d\u00f6ng\u00fcs\u00fc, her bir dizi eleman\u0131 i\u00e7in bir callback fonksiyonunu \u00e7a\u011f\u0131r\u0131r. <\/p>\n
\nconst names = [\"Ahmet\", \"Mehmet\", \"Ay\u015fe\"];\n\nnames.forEach((name) => {\n  console.log(name);\n});\n<\/code><\/pre>\n
5. `map` Metodu<\/h2>\n
`map` metodu, dizi elemanlar\u0131n\u0131 d\u00f6n\u00fc\u015ft\u00fcrmek i\u00e7in kullan\u0131l\u0131r. `map` metodu, her bir dizi eleman\u0131 i\u00e7in bir callback fonksiyonunu \u00e7a\u011f\u0131r\u0131r ve d\u00f6n\u00fc\u015ft\u00fcr\u00fclen elemanlar\u0131 i\u00e7eren yeni bir dizi olu\u015fturur. <\/p>\n
\nconst numbers = [1, 2, 3];\n\nconst squaredNumbers = numbers.map((number) => number * number);\n\nconsole.log(squaredNumbers); \/\/ \u00c7\u0131kt\u0131: [1, 4, 9]\n<\/code><\/pre>\n
6. `filter` Metodu<\/h2>\n
`filter` metodu, dizi elemanlar\u0131n\u0131 filtrelemek i\u00e7in kullan\u0131l\u0131r. `filter` metodu, her bir dizi eleman\u0131 i\u00e7in bir callback fonksiyonunu \u00e7a\u011f\u0131r\u0131r ve ko\u015fulu sa\u011flayan elemanlar\u0131 i\u00e7eren yeni bir dizi olu\u015fturur. <\/p>\n
\nconst numbers = [1, 2, 3, 4, 5];\n\nconst evenNumbers = numbers.filter((number) => number % 2 === 0);\n\nconsole.log(evenNumbers); \/\/ \u00c7\u0131kt\u0131: [2, 4]\n<\/code><\/pre>\n
7. `reduce` Metodu<\/h2>\n
`reduce` metodu, dizi elemanlar\u0131n\u0131 birle\u015ftirmek i\u00e7in kullan\u0131l\u0131r. `reduce` metodu, her bir dizi eleman\u0131 i\u00e7in bir callback fonksiyonunu \u00e7a\u011f\u0131r\u0131r ve \u00f6nceki ad\u0131mda \u00fcretilen sonucu bir sonraki elemana uygular. <\/p>\n
\nconst numbers = [1, 2, 3, 4, 5];\n\nconst sum = numbers.reduce((accumulator, currentValue) => accumulator + currentValue, 0);\n\nconsole.log(sum); \/\/ \u00c7\u0131kt\u0131: 15\n<\/code><\/pre>\n
8. `async` ve `await`<\/h2>\n
`async` ve `await` anahtar s\u00f6zc\u00fckleri, asenkron i\u015flemleri daha okunabilir ve y\u00f6netilebilir hale getirmek i\u00e7in kullan\u0131l\u0131r. `async` anahtar s\u00f6zc\u00fc\u011f\u00fc ile bildirilen bir fonksiyon, asenkron i\u015flemleri ger\u00e7ekle\u015ftirebilir. `await` anahtar s\u00f6zc\u00fc\u011f\u00fc ise, asenkron i\u015flemin tamamlanmas\u0131n\u0131 bekler. <\/p>\n
\nasync function fetchData() {\n  const response = await fetch(\"https:\/\/fatihsoysal.com\");\n  const data = await response.json();\n  return data;\n}\n\nfetchData().then((data) => console.log(data));\n<\/code><\/pre>\n
9. `try…catch` Blo\u011fu<\/h2>\n
`try…catch` blo\u011fu, hata yakalama mekanizmas\u0131d\u0131r. `try` blo\u011fu i\u00e7inde hata olu\u015fturabilecek kodlar yer al\u0131r. Hata olu\u015fursa `catch` blo\u011fu \u00e7al\u0131\u015f\u0131r ve hatay\u0131 i\u015fler. <\/p>\n
\ntry {\n  const number = parseInt(\"abc\");\n  console.log(number);\n} catch (error) {\n  console.error(\"Hata olu\u015ftu:\", error);\n}\n<\/code><\/pre>\n
10. `this` Ba\u011flam\u0131<\/h2>\n
`this` anahtar s\u00f6zc\u00fc\u011f\u00fc, fonksiyonun \u00e7a\u011f\u0131r\u0131ld\u0131\u011f\u0131 ba\u011flama ba\u011fl\u0131 olarak farkl\u0131 de\u011ferler alabilir. Bir fonksiyon global kapsamda \u00e7a\u011f\u0131r\u0131l\u0131rsa, `this` global nesnesine kar\u015f\u0131l\u0131k gelir. Bir nesnenin metodu olarak \u00e7a\u011f\u0131r\u0131l\u0131rsa, `this` nesnesine kar\u015f\u0131l\u0131k gelir.  <\/p>\n
\nconst myObject = {\n  name: \"Fatih\",\n  sayName: function() {\n    console.log(this.name);\n  }\n};\n\nmyObject.sayName(); \/\/ \u00c7\u0131kt\u0131: Fatih\n<\/code><\/pre>\n
11. `call`, `apply` ve `bind`<\/h2>\n
`call`, `apply` ve `bind` metotlar\u0131, `this` ba\u011flam\u0131n\u0131 de\u011fi\u015ftirmek i\u00e7in kullan\u0131l\u0131r. `call` metodu, fonksiyonu belirtilen ba\u011flamda \u00e7a\u011f\u0131r\u0131r ve belirtilen arg\u00fcmanlar\u0131 ge\u00e7irir. `apply` metodu, `call` metodu ile ayn\u0131 i\u015flevi g\u00f6r\u00fcr, ancak arg\u00fcmanlar\u0131 bir dizi i\u00e7inde ge\u00e7irir. `bind` metodu, fonksiyonu belirtilen ba\u011flama ba\u011flar ve yeni bir fonksiyon d\u00f6nd\u00fcr\u00fcr.  <\/p>\n
\nfunction greet(message) {\n  console.log(this.name + \" \" + message);\n}\n\nconst person = {\n  name: \"Fatih\"\n};\n\ngreet.call(person, \"Merhaba!\"); \/\/ \u00c7\u0131kt\u0131: Fatih Merhaba!\n<\/code><\/pre>\n
12. `Object.keys()`, `Object.values()`, `Object.entries()`<\/h2>\n
Bu metotlar, nesnelerin \u00f6zelliklerini almak i\u00e7in kullan\u0131l\u0131r. `Object.keys()` metodu, bir nesnenin t\u00fcm \u00f6zellik adlar\u0131n\u0131 i\u00e7eren bir dizi d\u00f6nd\u00fcr\u00fcr. `Object.values()` metodu, bir nesnenin t\u00fcm \u00f6zellik de\u011ferlerini i\u00e7eren bir dizi d\u00f6nd\u00fcr\u00fcr. `Object.entries()` metodu ise, bir nesnenin her bir \u00f6zellik ad\u0131-de\u011fer \u00e7iftini i\u00e7eren bir dizi d\u00f6nd\u00fcr\u00fcr. <\/p>\n
\nconst myObject = {\n  name: \"Fatih\",\n  age: 30\n};\n\nconsole.log(Object.keys(myObject)); \/\/ \u00c7\u0131kt\u0131: [\"name\", \"age\"]\nconsole.log(Object.values(myObject)); \/\/ \u00c7\u0131kt\u0131: [\"Fatih\", 30]\nconsole.log(Object.entries(myObject)); \/\/ \u00c7\u0131kt\u0131: [[\"name\", \"Fatih\"], [\"age\", 30]]\n<\/code><\/pre>\n
13. Destructuring<\/h2>\n
Destructuring, de\u011fi\u015fkenleri bir nesne veya diziden kolayca ay\u0131rmak i\u00e7in kullan\u0131l\u0131r. Destructuring, daha az kodla daha fazla veri ay\u0131rmam\u0131za olanak tan\u0131r.  <\/p>\n
\nconst myObject = {\n  name: \"Fatih\",\n  age: 30\n};\n\nconst { name, age } = myObject;\n\nconsole.log(name); \/\/ \u00c7\u0131kt\u0131: Fatih\nconsole.log(age); \/\/ \u00c7\u0131kt\u0131: 30\n<\/code><\/pre>\n
14. Default Parametreler<\/h2>\n
Fonksiyonlara varsay\u0131lan parametreler tan\u0131mlayabiliriz. Fonksiyon \u00e7a\u011fr\u0131ld\u0131\u011f\u0131nda bu parametreler belirtilmezse, varsay\u0131lan de\u011fer kullan\u0131l\u0131r.  <\/p>\n
\nfunction greet(name = \"Arkada\u015f\") {\n  console.log(\"Merhaba \" + name);\n}\n\ngreet(); \/\/ \u00c7\u0131kt\u0131: Merhaba Arkada\u015f\ngreet(\"Fatih\"); \/\/ \u00c7\u0131kt\u0131: Merhaba Fatih\n<\/code><\/pre>\n
15. `Spread` Operat\u00f6r\u00fc<\/h2>\n
`Spread` operat\u00f6r\u00fc (`…`), dizileri ve nesneleri yaymak i\u00e7in kullan\u0131l\u0131r. `Spread` operat\u00f6r\u00fc, dizi veya nesnenin elemanlar\u0131n\u0131 di\u011fer diziler veya nesnelere kopyalamam\u0131za olanak tan\u0131r. <\/p>\n
\nconst numbers1 = [1, 2, 3];\nconst numbers2 = [4, 5, 6];\n\nconst allNumbers = [...numbers1, ...numbers2];\n\nconsole.log(allNumbers); \/\/ \u00c7\u0131kt\u0131: [1, 2, 3, 4, 5, 6]\n<\/code><\/pre>\n
16. `Rest` Operat\u00f6r\u00fc<\/h2>\n
`Rest` operat\u00f6r\u00fc (`…`), fonksiyonlara ge\u00e7irilen de\u011fi\u015fken say\u0131da arg\u00fcman\u0131 toplamak i\u00e7in kullan\u0131l\u0131r. `Rest` operat\u00f6r\u00fc, arg\u00fcmanlar\u0131 bir dizi i\u00e7inde toplar.  <\/p>\n
\nfunction sum(...numbers) {\n  let total = 0;\n  for (const number of numbers) {\n    total += number;\n  }\n  return total;\n}\n\nconsole.log(sum(1, 2, 3, 4)); \/\/ \u00c7\u0131kt\u0131: 10\n<\/code><\/pre>\n
17. `setTimeout` ve `setInterval`<\/h2>\n
`setTimeout` ve `setInterval` metotlar\u0131, belirli bir s\u00fcre sonra veya d\u00fczenli aral\u0131klarla fonksiyonlar\u0131 \u00e7a\u011f\u0131rmak i\u00e7in kullan\u0131l\u0131r. `setTimeout` metodu, fonksiyonu yaln\u0131zca bir kez \u00e7a\u011f\u0131r\u0131r. `setInterval` metodu ise, fonksiyonu belirtilen aral\u0131klarda tekrar tekrar \u00e7a\u011f\u0131r\u0131r.  <\/p>\n
\nsetTimeout(() => {\n  console.log(\"1 saniye sonra\");\n}, 1000);\n\nsetInterval(() => {\n  console.log(\"Her 1 saniyede bir\");\n}, 1000);\n<\/code><\/pre>\n
18. DOM Manip\u00fclasyonu<\/h2>\n
DOM (Document Object Model), HTML belgesinin yap\u0131sal g\u00f6sterimidir. DOM, JavaScript ile web sayfalar\u0131ndaki elementleri se\u00e7memizi, de\u011fi\u015ftirmemizi ve yeni elementler eklememizi sa\u011flar.  <\/p>\n
\nconst myElement = document.getElementById(\"myElement\");\n\nmyElement.innerHTML = \"Merhaba D\u00fcnya!\";\n<\/code><\/pre>\n
19. Event Listener’lar<\/h2>\n
Event listener’lar, kullan\u0131c\u0131 eylemlerine veya taray\u0131c\u0131 olaylar\u0131na tepki vermek i\u00e7in kullan\u0131l\u0131r. Event listener’lar, belirli bir elemente eklenir ve belirli bir olay\u0131n tetiklenmesi durumunda bir fonksiyonu \u00e7a\u011f\u0131r\u0131r.  <\/p>\n
\nconst myButton = document.getElementById(\"myButton\");\n\nmyButton.addEventListener(\"click\", () => {\n  console.log(\"Butona t\u0131kland\u0131!\");\n});\n<\/code><\/pre>\n
20. Kod Stilleri ve \u0130yi Uygulamalar<\/h2>\n
\u0130yi kod stilleri ve iyi uygulamalar, kodun okunabilirli\u011fini, s\u00fcrd\u00fcr\u00fclebilirli\u011fini ve g\u00fcvenilirli\u011fini art\u0131r\u0131r. Kodlama standartlar\u0131na uymak, kod taban\u0131n\u0131 daha kolay anlamay\u0131 ve bak\u0131m\u0131 yapmay\u0131 sa\u011flar. JavaScript i\u00e7in yayg\u0131n olarak kullan\u0131lan kodlama standartlar\u0131ndan biri olan **Airbnb JavaScript Style Guide**’a [buradan](https:\/\/www.airbnb.com\/manage-listing\/2579024\/rental-agreement) ula\u015fabilirsiniz.  <\/p>\n
Kod stilleri ve iyi uygulamalar, JavaScript geli\u015ftirmede b\u00fcy\u00fck \u00f6nem ta\u015f\u0131r. Bu konular, daha temiz, daha organize ve daha s\u00fcrd\u00fcr\u00fclebilir kodlar yaz\u0131lmas\u0131n\u0131 sa\u011flar.  <\/p>\n
Bu ipu\u00e7lar\u0131n\u0131n, JavaScript \u00f6\u011frenme yolculu\u011funuzu kolayla\u015ft\u0131rmas\u0131n\u0131 ve daha verimli bir geli\u015ftirici olman\u0131za yard\u0131mc\u0131 olmas\u0131n\u0131 umuyorum.  <\/p>\n
Siz de JavaScript’in inceliklerini ke\u015ffetmek ve daha derinlemesine bilgi edinmek i\u00e7in [fatihsoysal.com](https:\/\/fatihsoysal.com\/) sitesini ziyaret edebilir ve di\u011fer blog yaz\u0131lar\u0131m\u0131 inceleyebilirsiniz.   <\/p>\n
#Etiketler<\/h2>\n
#javascript #webgeli\u015ftirme #kodlama #ipu\u00e7lar\u0131 #geli\u015ftirici #programlama #webteknolojileri #dom #kodstilleri #iyiu uygulamalar #async #await #arrowfonksiyonlar\u0131 #desctucturing #spread #rest #dommanip\u00fclasyonu #eventlistener<\/p>\n","protected":false},"excerpt":{"rendered":"20 Her JavaScript Geli\u015ftiricisinin Bilmesi Gereken \u0130pucu JavaScript, web geli\u015ftirmenin olmazsa olmaz dili. G\u00fcn\u00fcm\u00fczde hemen her web sitesi…","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-3625","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-genel","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"\n20 Her JavaScript Geli\u015ftiricisinin Bilmesi Gereken \u0130pucu<\/title>\n<meta name=\"description\" content=\"JavaScript, web geli\u015ftirmenin olmazsa olmaz dili. G\u00fcn\u00fcm\u00fczde hemen her web sitesi ve web uygulamas\u0131 JavaScript'i kullan\u0131yor. Bu dil, web sayfalar\u0131na interaktiflik ve dinamiklik kazand\u0131rmak i\u00e7in olmazsa olmaz. Ancak, JavaScript'in sundu\u011fu t\u00fcm olanaklar\u0131 kullanabilmek i\u00e7in, baz\u0131 temel ipu\u00e7lar\u0131n\u0131 bilmek \u015fart. Bu makalede, her JavaScript geli\u015ftiricisinin bilmesi gereken 20 ipucu sizlerle payla\u015f\u0131yorum.\" \/>\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\/20-her-javascript-gelistiricisinin-bilmesi-gereken-ipucu\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"20 Her JavaScript Geli\u015ftiricisinin Bilmesi Gereken \u0130pucu\" \/>\n<meta property=\"og:description\" content=\"JavaScript, web geli\u015ftirmenin olmazsa olmaz dili. G\u00fcn\u00fcm\u00fczde hemen her web sitesi ve web uygulamas\u0131 JavaScript'i kullan\u0131yor. Bu dil, web sayfalar\u0131na interaktiflik ve dinamiklik kazand\u0131rmak i\u00e7in olmazsa olmaz. Ancak, JavaScript'in sundu\u011fu t\u00fcm olanaklar\u0131 kullanabilmek i\u00e7in, baz\u0131 temel ipu\u00e7lar\u0131n\u0131 bilmek \u015fart. 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