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bu yüzden `require('.\u002Fmath')` doğrudan bu fonksiyonu döndürür. `add(2, 3)` çağrısı `2 + 3` işlemini yapar ve sonuç `5` olur.",{"id":188,"topic":9,"difficulty":189,"body":190,"options":191,"correct_key":184,"explanation":200},"019f71b0-db84-7b33-bd17-d1d39dc2d4b0",2,"```javascript\n\u002F\u002F counter.js\nlet count = 0;\nmodule.exports = {\n  increment() {\n    count++;\n    return count;\n  }\n};\n\n\u002F\u002F main.js\nconst counterA = require('.\u002Fcounter');\nconst counterB = require('.\u002Fcounter');\nconsole.log(counterA.increment());\nconsole.log(counterB.increment());\n```\nBu kod ne yazdırır?",[192,194,196,198],{"key":175,"text":193},"1, sonra 1",{"key":178,"text":195},"0, sonra 1",{"key":181,"text":197},"undefined, sonra undefined",{"key":184,"text":199},"1, sonra 2","Node modülleri, çözümlenmiş dosya yoluna göre önbelleğe alır; bu yüzden `counterA` ve `counterB`, `require('.\u002Fcounter')`'ın döndürdüğü aynı nesneye işaret eder. Paylaşılan `count` değişkeni çağrılar arasında kalıcıdır, bu yüzden ilk `increment()` çağrısı `1`, ikincisi `2` döner.",{"id":202,"topic":9,"difficulty":189,"body":203,"options":204,"correct_key":178,"explanation":213},"019f71b0-db85-7806-8186-eaf2c91e2d49","```javascript\nconst EventEmitter = require('events');\nconst emitter = new EventEmitter();\n\nemitter.on('greet', () => console.log('A'));\nemitter.emit('greet');\nconsole.log('B');\n```\nSırasıyla ne yazdırılır?",[205,207,209,211],{"key":175,"text":206},"B, sonra A",{"key":178,"text":208},"A, sonra B",{"key":181,"text":210},"Sadece B",{"key":184,"text":212},"Sadece A","`emit()`, kayıtlı tüm listener'ları geri dönmeden önce senkron olarak çağırır. Bu yüzden `'A'` yazan listener çalışıp biter, ardından `emit()` bir sonraki satıra döner ve `'B'` yazdırılır.",{"id":215,"topic":9,"difficulty":189,"body":216,"options":217,"correct_key":181,"explanation":226},"019f71b0-db8b-724c-ae6e-81a3342dc275","```javascript\nconst EventEmitter = require('events');\nconst emitter = new EventEmitter();\n\nemitter.on('tick', () => console.log('first'));\nemitter.on('tick', () => console.log('second'));\nemitter.emit('tick');\n```\nNe yazdırılır?",[218,220,222,224],{"key":175,"text":219},"second, sonra first",{"key":178,"text":221},"sadece second, çünkü son eklenen listener öncekilerin yerini alır",{"key":181,"text":223},"first, sonra second",{"key":184,"text":225},"sıra garanti değildir ve her çalıştırmada değişebilir","EventEmitter, aynı event için listener'ları `.on()` ile kaydedildikleri sırayla çağırır. İkinci bir listener eklemek birincinin yerini almaz.",{"id":228,"topic":9,"difficulty":189,"body":229,"options":230,"correct_key":175,"explanation":239},"019f71b0-db8b-7a87-9524-20b677da8283","Node.js stream'lerinde, bir Readable stream'e `'data'` event listener'ı eklendiği anda ne olur?",[231,233,235,237],{"key":175,"text":232},"Stream flowing mode'a geçer ve chunk'ları otomatik olarak yaymaya başlar.",{"key":178,"text":234},"Stream, `.resume()` açıkça çağrılana kadar kalıcı olarak duraklar.",{"key":181,"text":236},"`.pipe()` de çağrılmadıkça hiçbir şey değişmez.",{"key":184,"text":238},"Stream, herhangi bir veri yaymadan önce kaynağın tamamını belleğe okur.","`'data'` listener'ı eklemek, bir Readable stream'i flowing mode'a geçirmenin yollarından biridir; bu modda chunk'lar `.read()` manuel çağrılmadan, hazır oldukları anda listener'lara iletilir.",{"id":241,"topic":9,"difficulty":171,"body":242,"options":243,"correct_key":181,"explanation":251},"019f71b0-db8c-75f6-bc87-ba6f8144b5eb","```javascript\nconst { Writable } = require('stream');\n\nconst writable = new Writable({\n  write(chunk, encoding, callback) {\n    console.log(chunk.toString());\n    callback();\n  }\n});\n\nwritable.write('hello');\nwritable.end();\n```\nNe yazdırılır?",[244,245,247,249],{"key":175,"text":182},{"key":178,"text":246},"[object Object]",{"key":181,"text":248},"hello",{"key":184,"text":250},"Hiçbir şey — write() bir string değil, Buffer gerektirir","Özel `write()` implementasyonu, chunk'ı `.toString()` ile string'e çevirip yazdırır. Writable stream'ler varsayılan olarak string chunk'ları kabul eder ve içeride Buffer'a çevirir, bu yüzden `'hello'` yazdırılır.",{"fields":253,"seniorities":423,"interview_shapes":424,"locales":429,"oauth":431,"question_count":434,"coach_enabled":435,"jd_match_enabled":435},[254,265,285,302,326,339,358,377,397,404,410,417],{"key":5,"name_tr":6,"name_en":6,"sort":171,"specializations":255},[256,259,260,261,262,263,264],{"key":257,"name":258,"field":5},"general","Genel",{"key":154,"name":155,"field":5},{"key":166,"name":167,"field":5},{"key":157,"name":158,"field":5},{"key":150,"name":151,"field":5},{"key":160,"name":161,"field":5},{"key":163,"name":164,"field":5},{"key":266,"name_tr":267,"name_en":267,"sort":189,"specializations":268},"frontend","Frontend",[269,270,273,276,279,282],{"key":257,"name":258,"field":266},{"key":271,"name":272,"field":266},"javascript","JavaScript",{"key":274,"name":275,"field":266},"typescript","TypeScript",{"key":277,"name":278,"field":266},"react","React",{"key":280,"name":281,"field":266},"vue","Vue",{"key":283,"name":284,"field":266},"angular","Angular",{"key":286,"name_tr":287,"name_en":287,"sort":288,"specializations":289},"fullstack","Fullstack",3,[290,291,292,293,294,295,296,297,298,299,300,301],{"key":257,"name":258,"field":286},{"key":154,"name":155,"field":5},{"key":166,"name":167,"field":5},{"key":157,"name":158,"field":5},{"key":150,"name":151,"field":5},{"key":160,"name":161,"field":5},{"key":163,"name":164,"field":5},{"key":271,"name":272,"field":266},{"key":274,"name":275,"field":266},{"key":277,"name":278,"field":266},{"key":280,"name":281,"field":266},{"key":283,"name":284,"field":266},{"key":303,"name_tr":304,"name_en":304,"sort":305,"specializations":306},"devops-cloud","DevOps \u002F Cloud",4,[307,308,311,314,317,320,323],{"key":257,"name":258,"field":303},{"key":309,"name":310,"field":303},"aws","AWS",{"key":312,"name":313,"field":303},"gcp","GCP",{"key":315,"name":316,"field":303},"azure","Azure",{"key":318,"name":319,"field":303},"kubernetes","Kubernetes",{"key":321,"name":322,"field":303},"terraform","Terraform",{"key":324,"name":325,"field":303},"linux","Linux",{"key":327,"name_tr":328,"name_en":328,"sort":329,"specializations":330},"ai-engineer","AI Engineer",5,[331,332,333,336],{"key":257,"name":258,"field":327},{"key":166,"name":167,"field":327},{"key":334,"name":335,"field":327},"llm-rag","LLM\u002FRAG",{"key":337,"name":338,"field":327},"mlops","MLOps",{"key":340,"name_tr":341,"name_en":342,"sort":343,"specializations":344},"database","Veritabanı","Database",6,[345,346,349,352,355],{"key":257,"name":258,"field":340},{"key":347,"name":348,"field":340},"postgresql","PostgreSQL",{"key":350,"name":351,"field":340},"mysql","MySQL",{"key":353,"name":354,"field":340},"mongodb","MongoDB",{"key":356,"name":357,"field":340},"redis","Redis",{"key":359,"name_tr":360,"name_en":361,"sort":362,"specializations":363},"mobile","Mobil","Mobile",7,[364,365,368,371,374],{"key":257,"name":258,"field":359},{"key":366,"name":367,"field":359},"ios-swift","iOS (Swift)",{"key":369,"name":370,"field":359},"android-kotlin","Android (Kotlin)",{"key":372,"name":373,"field":359},"flutter","Flutter",{"key":375,"name":376,"field":359},"react-native","React Native",{"key":143,"name_tr":144,"name_en":378,"sort":379,"specializations":380},"Security",8,[381,382,385,388,391,394],{"key":257,"name":258,"field":143},{"key":383,"name":384,"field":143},"appsec","AppSec",{"key":386,"name":387,"field":143},"offensive-pentest","Offensive \u002F Pentest",{"key":389,"name":390,"field":143},"cloud-security","Cloud Security",{"key":392,"name":393,"field":143},"devsecops","DevSecOps",{"key":395,"name":396,"field":143},"blue-team-incident","Blue Team \u002F Incident",{"key":398,"name_tr":399,"name_en":400,"sort":401,"specializations":402},"qa-test-automation","QA \u002F Test Otomasyonu","QA \u002F Test Automation",9,[403],{"key":257,"name":258,"field":398},{"key":405,"name_tr":406,"name_en":406,"sort":407,"specializations":408},"data-engineer","Data Engineer",10,[409],{"key":257,"name":258,"field":405},{"key":411,"name_tr":412,"name_en":413,"sort":414,"specializations":415},"game-dev","Oyun Geliştirme","Game Development",11,[416],{"key":257,"name":258,"field":411},{"key":418,"name_tr":419,"name_en":419,"sort":420,"specializations":421},"ml-engineer","ML Engineer",12,[422],{"key":257,"name":258,"field":418},[14,15,16],{"junior":425,"mid":427,"senior":428},{"questions":426,"median_sec":3},20,{"questions":426,"median_sec":3},{"questions":426,"median_sec":3},[10,430],"en",[432,433],"google","github",21750,true]