{"id":28419,"date":"2025-08-29T13:00:21","date_gmt":"2025-08-29T10:00:21","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/javascript-typescriptte-promise-async-await-ve-playwright-cypress-ile-uygulamali-rehber\/"},"modified":"2025-08-29T13:00:21","modified_gmt":"2025-08-29T10:00:21","slug":"javascript-typescriptte-promise-async-await-ve-playwright-cypress-ile-uygulamali-rehber","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/javascript-typescriptte-promise-async-await-ve-playwright-cypress-ile-uygulamali-rehber\/","title":{"rendered":"JavaScript\/TypeScript&#8217;te Promise, Async\/Await ve Playwright\/Cypress ile Uygulamal\u0131 Rehber"},"content":{"rendered":"<p>JavaScript\/TypeScript&#8217;te Promise, Async\/Await ve Playwright\/Cypress ile Uygulamal\u0131 Rehber<\/p>\n<p>Modern web geli\u015ftirmede asenkron i\u015flemler ka\u00e7\u0131n\u0131lmazd\u0131r.  API \u00e7a\u011fr\u0131lar\u0131, dosya okuma i\u015flemleri veya uzun s\u00fcre\u00e7li hesaplamalar gibi i\u015flemler ana uygulama ak\u0131\u015f\u0131n\u0131 engellemeden ger\u00e7ekle\u015ftirilmelidir.  Bu noktada Promise&#8217;ler, async\/await ve Playwright\/Cypress gibi ara\u00e7lar devreye girer. Bu makale, bu kavramlar\u0131 s\u0131f\u0131rdan ba\u015flayarak, pratik \u00f6rneklerle ve ileri seviye tekniklerle ad\u0131m ad\u0131m a\u00e7\u0131klayacakt\u0131r.  Playwright ve Cypress ile ger\u00e7ek d\u00fcnya senaryolar\u0131nda nas\u0131l kullan\u0131ld\u0131klar\u0131n\u0131 g\u00f6recek, performans kar\u015f\u0131la\u015ft\u0131rmalar\u0131 yapaca\u011f\u0131z ve olas\u0131 sorunlar\u0131 ele alaca\u011f\u0131z. Haz\u0131rsan\u0131z, asenkron d\u00fcnyas\u0131na dalal\u0131m!<\/p>\n<h2>Promise&#8217;ler: Asenkron \u0130\u015flemlerin Temeli<\/h2>\n<p>Promise&#8217;ler, bir i\u015flemin gelecekte bir de\u011fere sahip olaca\u011f\u0131n\u0131 temsil eden nesnelerdir.  Bu de\u011fer ya ba\u015far\u0131l\u0131 bir sonu\u00e7 (resolved) ya da bir hata (rejected) olabilir.  Bir Promise, \u00fc\u00e7 ana durumdan birinde bulunur: <em>pending<\/em> (bekleyen), <em>fulfilled<\/em> (tamamlanm\u0131\u015f) ve <em>rejected<\/em> (reddedilmi\u015f).  <code>then()<\/code> metodu, Promise ba\u015far\u0131l\u0131 bir \u015fekilde tamamland\u0131\u011f\u0131nda \u00e7al\u0131\u015facak fonksiyonu, <code>catch()<\/code> metodu ise hata durumunda \u00e7al\u0131\u015facak fonksiyonu tan\u0131mlar.  Promise&#8217;lerin temel avantaj\u0131, asenkron i\u015flemlerin daha okunakl\u0131 ve y\u00f6netilebilir bir \u015fekilde ele al\u0131nmas\u0131n\u0131 sa\u011flamas\u0131d\u0131r.<\/p>\n<p>\u00d6rne\u011fin, bir API \u00e7a\u011fr\u0131s\u0131 yaparken, Promise kullanarak sonucu bekleyebilir ve hata durumlar\u0131n\u0131 y\u00f6netebiliriz:<\/p>\n<pre><code class=\"language-javascript\">fetch(&#039;https:\/\/api.example.com\/data&#039;)\n  .then(response => response.json())\n  .then(data => console.log(&#039;Veriler:&#039;, data))\n  .catch(error => console.error(&#039;Hata:&#039;, error));<\/pre>\n<p><\/code><\/p>\n<p>Bu kodda, <code>fetch()<\/code> fonksiyonu bir Promise d\u00f6nd\u00fcr\u00fcr.  <code>.then()<\/code> metotlar\u0131, ba\u015far\u0131l\u0131 bir yan\u0131t al\u0131nd\u0131\u011f\u0131nda ve veriler ayr\u0131\u015ft\u0131r\u0131ld\u0131ktan sonra \u00e7al\u0131\u015f\u0131r.  <code>.catch()<\/code> metodu ise hata durumunda tetiklenir.  Promise'ler, karma\u015f\u0131k asenkron i\u015flemleri zincirleme yaparak daha okunakl\u0131 hale getirmemize olanak tan\u0131r. Daha fazla bilgi i\u00e7in <a href=\"https:\/\/fatihsoysal.com\">Fatih Soysal'\u0131n web sitesini<\/a> ziyaret edebilirsiniz.<\/p>\n<h2>Async\/Await: Promise'leri Daha Okunakl\u0131 Hale Getirmek<\/h2>\n<p>Async\/await, Promise'lerin daha senkron bir \u015fekilde yaz\u0131lmas\u0131n\u0131 sa\u011flayan bir s\u00f6zdizimsel \u015fekerdir.  <code>async<\/code> anahtar kelimesi, bir fonksiyonun bir Promise d\u00f6nd\u00fcrece\u011fini belirtir.  <code>await<\/code> anahtar kelimesi ise bir Promise'in sonu\u00e7lanmas\u0131n\u0131 bekler ve sonucu d\u00f6nd\u00fcr\u00fcr.  Async\/await, kodun okunabilirli\u011fini \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131r\u0131r ve hata y\u00f6netimini kolayla\u015ft\u0131r\u0131r.<\/p>\n<p>Ayn\u0131 API \u00e7a\u011fr\u0131s\u0131n\u0131 async\/await kullanarak yazal\u0131m:<\/p>\n<pre><code class=\"language-javascript\">async function fetchData() {\n  try {\n    const response = await fetch(&#039;https:\/\/api.example.com\/data&#039;);\n    const data = await response.json();\n    console.log(&#039;Veriler:&#039;, data);\n  } catch (error) {\n    console.error(&#039;Hata:&#039;, error);\n  }\n}\n\nfetchData();<\/pre>\n<p><\/code><\/p>\n<p>Bu \u00f6rnekte, <code>fetchData()<\/code> fonksiyonu <code>async<\/code> ile tan\u0131mlanm\u0131\u015ft\u0131r.  <code>await<\/code> anahtar kelimesi, <code>fetch()<\/code> ve <code>response.json()<\/code> fonksiyonlar\u0131n\u0131n sonu\u00e7lar\u0131n\u0131 bekler.  <code>try...catch<\/code> blo\u011fu, hata y\u00f6netimini kolayla\u015ft\u0131r\u0131r.  Async\/await, \u00f6zellikle birden fazla Promise'in s\u0131ral\u0131 olarak \u00e7al\u0131\u015ft\u0131r\u0131lmas\u0131 gerekti\u011finde kodun okunabilirli\u011fini b\u00fcy\u00fck \u00f6l\u00e7\u00fcde art\u0131r\u0131r.<\/p>\n<h3>Async\/Await ile Birden Fazla Promise'i Paralel \u00c7al\u0131\u015ft\u0131rmak<\/h3>\n<p>Birden fazla Promise'i paralel olarak \u00e7al\u0131\u015ft\u0131rmak, performans\u0131 art\u0131rmak i\u00e7in etkili bir y\u00f6ntemdir.  <code>Promise.all()<\/code> metodu, bir Promise dizisinin t\u00fcm\u00fcn\u00fc bekler ve sonu\u00e7lar\u0131n\u0131 bir dizi olarak d\u00f6nd\u00fcr\u00fcr.  Async\/await ile birlikte kullan\u0131ld\u0131\u011f\u0131nda, bu i\u015flem daha da okunakl\u0131 hale gelir:<\/p>\n<pre><code class=\"language-javascript\">async function fetchMultipleData() {\n  const promises = [\n    fetch(&#039;https:\/\/api.example.com\/data1&#039;),\n    fetch(&#039;https:\/\/api.example.com\/data2&#039;),\n    fetch(&#039;https:\/\/api.example.com\/data3&#039;)\n  ];\n\n  try {\n    const responses = await Promise.all(promises);\n    const data = await Promise.all(responses.map(response => response.json()));\n    console.log(&#039;Veriler:&#039;, data);\n  } catch (error) {\n    console.error(&#039;Hata:&#039;, error);\n  }\n}\n\nfetchMultipleData();<\/pre>\n<p><\/code><\/p>\n<h2>Playwright ile Asenkron Test Otomasyonu<\/h2>\n<p>Playwright, modern web uygulamalar\u0131n\u0131 test etmek i\u00e7in g\u00fc\u00e7l\u00fc bir ara\u00e7t\u0131r.  Asenkron i\u015flemlerle ba\u015fa \u00e7\u0131kmak i\u00e7in, Playwright, Promise'ler ve async\/await'i kullan\u0131r.  Sayfa y\u00fcklenme s\u00fcreleri, API \u00e7a\u011fr\u0131lar\u0131 ve di\u011fer asenkron i\u015flemler, Playwright'in sa\u011flad\u0131\u011f\u0131 API'ler ile kolayca y\u00f6netilebilir.<\/p>\n<p>\u00d6rne\u011fin, bir web sayfas\u0131n\u0131n y\u00fcklenmesini bekleyip bir elementin g\u00f6r\u00fcn\u00fcrl\u00fc\u011f\u00fcn\u00fc kontrol edebiliriz:<\/p>\n<pre><code class=\"language-javascript\">const { chromium } = require(&#039;playwright&#039;);\n\nasync function testPageLoad() {\n  const browser = await chromium.launch();\n  const page = await browser.newPage();\n  await page.goto(&#039;https:\/\/www.example.com&#039;);\n  await page.waitForSelector(&#039;#myElement&#039;); \/\/ Elementin g\u00f6r\u00fcn\u00fcr olmas\u0131n\u0131 bekler\n  console.log(&#039;Element bulundu!&#039;);\n  await browser.close();\n}\n\ntestPageLoad();<\/pre>\n<p><\/code><\/p>\n<h2>Cypress ile Asenkron Test Otomasyonu<\/h2>\n<p>Cypress, Playwright'e benzer \u015fekilde asenkron i\u015flemleri destekleyen bir test otomasyon arac\u0131d\u0131r.  Cypress, \u00f6zellikle asenkron i\u015flemleri daha kolay bir \u015fekilde ele almay\u0131 sa\u011flar.  Cypress'in bekleyi\u015f mekanizmalar\u0131, asenkron i\u015flemlerin tamamlanmas\u0131n\u0131 otomatik olarak bekler.  Bu sayede, test kodlar\u0131 daha temiz ve okunakl\u0131 olur.<\/p>\n<p>\u00d6rnek olarak, bir API \u00e7a\u011fr\u0131s\u0131n\u0131n sonucunu do\u011frulayabiliriz:<\/p>\n<pre><code class=\"language-javascript\">describe(&#039;API \u00e7a\u011fr\u0131s\u0131 testi&#039;, () => {\n  it(&#039;API do\u011fru veri d\u00f6nd\u00fcr\u00fcyor&#039;, () => {\n    cy.request(&#039;https:\/\/api.example.com\/data&#039;).then((response) => {\n      expect(response.status).to.eq(200);\n      expect(response.body.data).to.not.be.null;\n    });\n  });\n});<\/pre>\n<p><\/code><\/p>\n<p>Cypress'in kendi dahili Promise y\u00f6netimi sayesinde, <code>then()<\/code> metodu ile API cevab\u0131n\u0131 i\u015flemek ve do\u011frulamalar yapmak olduk\u00e7a kolayd\u0131r.  Bu da test kodlar\u0131n\u0131n karma\u015f\u0131kl\u0131\u011f\u0131n\u0131 azalt\u0131r.<\/p>\n<h3>Playwright ve Cypress Performans Kar\u015f\u0131la\u015ft\u0131rmas\u0131<\/h3>\n<p>| \u00d6zellik         | Playwright                     | Cypress                       |<br \/>\n|-----------------|---------------------------------|--------------------------------|<br \/>\n| H\u0131z             | Genellikle daha h\u0131zl\u0131            | Genellikle daha yava\u015f           |<br \/>\n| Hata Y\u00f6netimi   | Daha detayl\u0131 hata raporlar\u0131      | Daha basit hata raporlar\u0131       |<br \/>\n| API Deste\u011fi     | Geni\u015f API deste\u011fi                 | Daha s\u0131n\u0131rl\u0131 API deste\u011fi       |<br \/>\n| \u00d6\u011frenme E\u011frisi  | Orta                            | Kolay                           |<br \/>\n| Cross-Browser    | Chromium, Firefox, WebKit  | Chrome a\u011f\u0131rl\u0131kl\u0131               |<\/p>\n<h2>\u00d6\u011frenme Yol Haritas\u0131<\/h2>\n<p><strong>Yeni Ba\u015flayan:<\/strong> Promise'lerin temel kavramlar\u0131n\u0131 ve <code>then()<\/code>, <code>catch()<\/code> metodlar\u0131n\u0131 \u00f6\u011frenin.  Basit asenkron i\u015flemleri Promise'ler ile y\u00f6netmeyi pratik yap\u0131n.<\/p>\n<p><strong>Orta Seviye:<\/strong> Async\/await s\u00f6zdizimini \u00f6\u011frenin ve Promise'leri daha okunakl\u0131 bir \u015fekilde kullan\u0131n.  <code>Promise.all()<\/code> ile birden fazla Promise'i paralel \u00e7al\u0131\u015ft\u0131rmay\u0131 \u00f6\u011frenin.  Playwright veya Cypress'in temel \u00f6zelliklerini inceleyin ve basit test senaryolar\u0131 olu\u015fturun.<\/p>\n<p><strong>\u0130leri Seviye:<\/strong>  Karma\u015f\u0131k asenkron i\u015flemleri y\u00f6netin.  Performans optimizasyonlar\u0131 yap\u0131n.  Playwright ve Cypress'in geli\u015fmi\u015f \u00f6zelliklerini kullanarak daha kapsaml\u0131 testler olu\u015fturun.  Hata y\u00f6netimi stratejileri geli\u015ftirin.<\/p>\n<h2>Sonu\u00e7<\/h2>\n<p>Promise'ler, async\/await ve Playwright\/Cypress, modern web geli\u015ftirmede asenkron i\u015flemleri y\u00f6netmek ve test etmek i\u00e7in olmazsa olmaz ara\u00e7lard\u0131r.  Bu ara\u00e7lar\u0131 do\u011fru ve etkili bir \u015fekilde kullanarak, daha sa\u011flam, performansl\u0131 ve okunakl\u0131 uygulamalar geli\u015ftirebilirsiniz.  Daha fazla bilgi i\u00e7in <a href=\"https:\/\/fatihsoysal.com\">Fatih Soysal'\u0131n web sitesini<\/a> inceleyebilirsiniz.<\/p>\n<h3>S\u0131k\u00e7a Sorulan Sorular<\/h3>\n<ul>\n<li><strong>Promise'ler neden \u00f6nemlidir?<\/strong> Asenkron i\u015flemlerin d\u00fczenli ve okunakl\u0131 bir \u015fekilde y\u00f6netilmesini sa\u011flarlar.<\/li>\n<li><strong>Async\/await'in avantajlar\u0131 nelerdir?<\/strong> Kodun okunabilirli\u011fini art\u0131r\u0131r ve hata y\u00f6netimini kolayla\u015ft\u0131r\u0131r.<\/li>\n<li><strong>Playwright ve Cypress aras\u0131ndaki farklar nelerdir?<\/strong> Performans, API deste\u011fi ve \u00f6\u011frenme e\u011frisi a\u00e7\u0131s\u0131ndan farkl\u0131l\u0131k g\u00f6sterirler.<\/li>\n<li><strong>Hata y\u00f6netimi nas\u0131l yap\u0131l\u0131r?<\/strong> <code>catch()<\/code> blo\u011fu ve <code>try...catch<\/code> yap\u0131lar\u0131 kullan\u0131labilir.<\/li>\n<li><strong>Performans\u0131 nas\u0131l art\u0131rabilirim?<\/strong>  <code>Promise.all()<\/code> ile paralel i\u015flem, gereksiz bekleyi\u015flerden ka\u00e7\u0131nma gibi y\u00f6ntemler kullan\u0131labilir.<\/li>\n<\/ul>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"JavaScript\/TypeScript&#8217;te Promise, Async\/Await ve Playwright\/Cypress ile Uygulamal\u0131 Rehber Modern web geli\u015ftirmede asenkron i\u015flemler ka\u00e7\u0131n\u0131lmazd\u0131r. API \u00e7a\u011fr\u0131lar\u0131, dosya okuma&hellip;","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-28419","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-genel","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.5 (Yoast SEO v25.3.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>JavaScript\/TypeScript&#039;te Promise, Async\/Await ve Playwright\/Cypress ile Uygulamal\u0131 Rehber<\/title>\n<meta name=\"description\" content=\"Modern web geli\u015ftirmede asenkron i\u015flemler ka\u00e7\u0131n\u0131lmazd\u0131r. API \u00e7a\u011fr\u0131lar\u0131, dosya okuma i\u015flemleri veya uzun s\u00fcre\u00e7li hesaplamalar gibi i\u015flemler ana uygulama ak\u0131\u015f\u0131n\u0131 engellemeden ger\u00e7ekle\u015ftirilmelidir. Bu noktada Promise&#039;ler, async\/await ve Playwright\/Cypress gibi ara\u00e7lar devreye girer. Bu makale, bu kavramlar\u0131 s\u0131f\u0131rdan ba\u015flayarak, pratik \u00f6rneklerle ve ileri seviye tekniklerle ad\u0131m ad\u0131m a\u00e7\u0131klayacakt\u0131r. Playwright ve Cypress ile ger\u00e7ek d\u00fcnya senaryolar\u0131nda nas\u0131l kullan\u0131ld\u0131klar\u0131n\u0131 g\u00f6recek, performans kar\u015f\u0131la\u015ft\u0131rmalar\u0131 yapaca\u011f\u0131z ve olas\u0131 sorunlar\u0131 ele alaca\u011f\u0131z. 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