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name;\nprint(name?.length);\n```\n`name` `null` olduğunda ne olur?",[149,151,153,155],{"key":133,"text":150},"`0` yazdırılır, çünkü null string'ler için `length` varsayılan olarak sıfırdır.",{"key":136,"text":152},"Program derlenemez çünkü `length`, `null` üzerinde tanımlı değildir.",{"key":139,"text":154},"Runtime'da bir `NoSuchMethodError` fırlatılır.",{"key":142,"text":156},"`null` yazdırılır, hiçbir exception fırlatılmaz.","`?.` operatörü kısa devre yapar: alıcı `null` ise, üye çağrılmak yerine tüm ifade `null` olarak değerlendirilir, bu yüzden hata oluşmaz.",{"id":159,"topic":9,"difficulty":129,"body":160,"options":161,"correct_key":136,"explanation":170},"019fa93e-4e06-731d-96b3-3cfd067fc330","```dart\nint? maybeCount;\nint count = maybeCount ?? 0;\n```\nBuradaki `??` operatörü ne yapar?",[162,164,166,168],{"key":133,"text":163},"`maybeCount` `null` değilse bir exception fırlatır.",{"key":136,"text":165},"`maybeCount` `null` ise `count`'a `0` atar, değilse `maybeCount`'un değerini atar.",{"key":139,"text":167},"`maybeCount`'u `0` ile karşılaştırır ve bir boolean döndürür.",{"key":142,"text":169},"Sadece iki operand da tam olarak aynı nullable tipte olduğunda çalışır.","`??` null-birleştirme operatörüdür: sol tarafı değerlendirir, o `null` ise sağ taraftaki ifadeye döner.",{"id":172,"topic":9,"difficulty":173,"body":174,"options":175,"correct_key":136,"explanation":184},"019fa93e-4e06-7e18-8414-e6d8a05c075d",2,"```dart\nString? name;\nprint(name!.length);\n```\n`name` `null` olduğunda ne olur?",[176,178,180,182],{"key":133,"text":177},"`length` için sessizce `0` döner.",{"key":136,"text":179},"Runtime'da bir exception fırlatılır çünkü `!` non-null olduğunu iddia etti ama değer `null`dur.",{"key":139,"text":181},"No-op olarak derlenir ve hiçbir şey yazdırmaz.",{"key":142,"text":183},"Derleyici bu kodu çalışmadan önce reddeder.","`!` (bang) operatörü derleyiciye \"bana güven, bu non-null\" der ve derleme zamanında nullability'i kaldırır; değer runtime'da gerçekten `null` ise bir `TypeError`\u002Fnull-check exception'ı fırlatır.",{"id":186,"topic":9,"difficulty":173,"body":187,"options":188,"correct_key":139,"explanation":197},"019fa93e-4e07-7834-8e31-4192f4014a39","`late String name;` gibi non-nullable bir field'da `late` anahtar kelimesinin amacı nedir?",[189,191,193,195],{"key":133,"text":190},"Field'ı nullable yapar, böylece güvenle atanmadan bırakılabilir.",{"key":136,"text":192},"Field'ın sadece `const` constructor'lar içinde tembel hesaplandığını işaretler.",{"key":139,"text":194},"Non-null kontrolünü, tanımlama\u002Fconstructor zamanı yerine ilk kullanım anına erteler.",{"key":142,"text":196},"Field'ın her okunduğunda yeniden değerlendirilmesini zorunlu kılar.","`late`, bir değişkenin non-nullable olmasına izin verirken başlatılmasının daha sonra (örn. `initState`'te) yapılmasına imkân tanır; derleyici ilk okumadan önce atanacağına güvenir, bu güven bozulursa runtime'da `LateInitializationError` fırlatır.",{"id":199,"topic":9,"difficulty":129,"body":200,"options":201,"correct_key":142,"explanation":210},"019fa93e-4e0b-7228-8da9-a29b8d58549e","Nullable field'ları olan bir class'ta named bir constructor parametresini `required` işaretlemenin önemi nedir?",[202,204,206,208],{"key":133,"text":203},"Sadece positional parametrelerde geçerlidir, named parametrelerde değil.",{"key":136,"text":205},"Parametrenin tipini, tanımlanan tipten bağımsız olarak otomatik olarak non-nullable yapar.",{"key":139,"text":207},"Sadece dokümantasyon\u002FIDE ipuçlarını etkiler, derleme zamanı etkisi yoktur.",{"key":142,"text":209},"Aksi halde named olarak opsiyonel olsa bile, çağıranları argümanı geçirmeye zorlar.","`required`, nullability'den bağımsızdır: named bir parametre `required` olup yine de nullable olabilir (`required int? x`), ya da opsiyonel ve non-nullable olabilir (varsayılanla). `required` sadece çağrı noktasının argümanı sağlamasını zorunlu kılar.",{"fields":212,"seniorities":388,"interview_shapes":389,"locales":394,"oauth":396,"question_count":399,"coach_enabled":400,"jd_match_enabled":400},[213,238,258,275,299,312,331,340,362,369,375,382],{"key":214,"name_tr":215,"name_en":215,"sort":129,"specializations":216},"backend","Backend",[217,220,223,226,229,232,235],{"key":218,"name":219,"field":214},"general","Genel",{"key":221,"name":222,"field":214},"go","Go",{"key":224,"name":225,"field":214},"python","Python",{"key":227,"name":228,"field":214},"java","Java",{"key":230,"name":231,"field":214},"csharp","C#\u002F.NET",{"key":233,"name":234,"field":214},"nodejs","Node.js",{"key":236,"name":237,"field":214},"php","PHP",{"key":239,"name_tr":240,"name_en":240,"sort":173,"specializations":241},"frontend","Frontend",[242,243,246,249,252,255],{"key":218,"name":219,"field":239},{"key":244,"name":245,"field":239},"javascript","JavaScript",{"key":247,"name":248,"field":239},"typescript","TypeScript",{"key":250,"name":251,"field":239},"react","React",{"key":253,"name":254,"field":239},"vue","Vue",{"key":256,"name":257,"field":239},"angular","Angular",{"key":259,"name_tr":260,"name_en":260,"sort":261,"specializations":262},"fullstack","Fullstack",3,[263,264,265,266,267,268,269,270,271,272,273,274],{"key":218,"name":219,"field":259},{"key":221,"name":222,"field":214},{"key":224,"name":225,"field":214},{"key":227,"name":228,"field":214},{"key":230,"name":231,"field":214},{"key":233,"name":234,"field":214},{"key":236,"name":237,"field":214},{"key":244,"name":245,"field":239},{"key":247,"name":248,"field":239},{"key":250,"name":251,"field":239},{"key":253,"name":254,"field":239},{"key":256,"name":257,"field":239},{"key":276,"name_tr":277,"name_en":277,"sort":278,"specializations":279},"devops-cloud","DevOps \u002F Cloud",4,[280,281,284,287,290,293,296],{"key":218,"name":219,"field":276},{"key":282,"name":283,"field":276},"aws","AWS",{"key":285,"name":286,"field":276},"gcp","GCP",{"key":288,"name":289,"field":276},"azure","Azure",{"key":291,"name":292,"field":276},"kubernetes","Kubernetes",{"key":294,"name":295,"field":276},"terraform","Terraform",{"key":297,"name":298,"field":276},"linux","Linux",{"key":300,"name_tr":301,"name_en":301,"sort":302,"specializations":303},"ai-engineer","AI Engineer",5,[304,305,306,309],{"key":218,"name":219,"field":300},{"key":224,"name":225,"field":300},{"key":307,"name":308,"field":300},"llm-rag","LLM\u002FRAG",{"key":310,"name":311,"field":300},"mlops","MLOps",{"key":313,"name_tr":314,"name_en":315,"sort":316,"specializations":317},"database","Veritabanı","Database",6,[318,319,322,325,328],{"key":218,"name":219,"field":313},{"key":320,"name":321,"field":313},"postgresql","PostgreSQL",{"key":323,"name":324,"field":313},"mysql","MySQL",{"key":326,"name":327,"field":313},"mongodb","MongoDB",{"key":329,"name":330,"field":313},"redis","Redis",{"key":5,"name_tr":6,"name_en":332,"sort":333,"specializations":334},"Mobile",7,[335,336,337,338,339],{"key":218,"name":219,"field":5},{"key":121,"name":122,"field":5},{"key":114,"name":115,"field":5},{"key":118,"name":119,"field":5},{"key":124,"name":125,"field":5},{"key":341,"name_tr":342,"name_en":343,"sort":344,"specializations":345},"security","Güvenlik","Security",8,[346,347,350,353,356,359],{"key":218,"name":219,"field":341},{"key":348,"name":349,"field":341},"appsec","AppSec",{"key":351,"name":352,"field":341},"offensive-pentest","Offensive \u002F Pentest",{"key":354,"name":355,"field":341},"cloud-security","Cloud Security",{"key":357,"name":358,"field":341},"devsecops","DevSecOps",{"key":360,"name":361,"field":341},"blue-team-incident","Blue Team \u002F Incident",{"key":363,"name_tr":364,"name_en":365,"sort":366,"specializations":367},"qa-test-automation","QA \u002F Test Otomasyonu","QA \u002F Test Automation",9,[368],{"key":218,"name":219,"field":363},{"key":370,"name_tr":371,"name_en":371,"sort":372,"specializations":373},"data-engineer","Data Engineer",10,[374],{"key":218,"name":219,"field":370},{"key":376,"name_tr":377,"name_en":378,"sort":379,"specializations":380},"game-dev","Oyun Geliştirme","Game Development",11,[381],{"key":218,"name":219,"field":376},{"key":383,"name_tr":384,"name_en":384,"sort":385,"specializations":386},"ml-engineer","ML Engineer",12,[387],{"key":218,"name":219,"field":383},[14,15,16],{"junior":390,"mid":392,"senior":393},{"questions":391,"median_sec":3},20,{"questions":391,"median_sec":3},{"questions":391,"median_sec":3},[10,395],"en",[397,398],"google","github",21750,true]