[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"me":3,"catalog:en:mobile\u002Ffl-dart-language-null-safety":4,"config":211},null,{"field_key":5,"field_name":6,"seniority":7,"topic_key":8,"topic_name":9,"spec_key":7,"spec_name":7,"locale":10,"cell_total":11,"field_total":12,"seniorities":13,"topics":17,"specs":112,"samples":126},"mobile","Mobile","","fl-dart-language-null-safety","Fl Dart Language Null Safety","en",75,2400,[14,15,16],"junior","mid","senior",[18,21,22,25,28,31,34,37,40,43,46,49,52,55,58,61,64,67,70,73,76,79,82,85,88,91,94,97,100,103,106,109],{"key":19,"name":20,"count":11},"fl-dart-async-isolates","Fl Dart Async Isolates",{"key":8,"name":9,"count":11},{"key":23,"name":24,"count":11},"fl-flutter-persistence-storage","Fl Flutter Persistence Storage",{"key":26,"name":27,"count":11},"fl-flutter-platform-channels-lifecycle","Fl Flutter Platform Channels Lifecycle",{"key":29,"name":30,"count":11},"fl-flutter-rendering-widget-tree","Fl Flutter Rendering Widget Tree",{"key":32,"name":33,"count":11},"fl-flutter-state-management-widgets","Fl Flutter State Management Widgets",{"key":35,"name":36,"count":11},"ios-core-data-swiftdata-persistence","Ios Core Data Swiftdata Persistence",{"key":38,"name":39,"count":11},"ios-lifecycle-background-execution","Ios Lifecycle Background Execution",{"key":41,"name":42,"count":11},"ios-memory-management-arc","Ios Memory Management Arc",{"key":44,"name":45,"count":11},"ios-swift-concurrency-structured","Ios Swift Concurrency Structured",{"key":47,"name":48,"count":11},"ios-swift-type-system-optionals","Ios Swift Type System Optionals",{"key":50,"name":51,"count":11},"ios-swiftui-state-rendering","Ios Swiftui State Rendering",{"key":53,"name":54,"count":11},"kt-android-lifecycle-background-execution","Kt Android Lifecycle Background Execution",{"key":56,"name":57,"count":11},"kt-android-memory-context-leaks","Kt Android Memory Context Leaks",{"key":59,"name":60,"count":11},"kt-android-room-persistence","Kt Android Room Persistence",{"key":62,"name":63,"count":11},"kt-jetpack-compose-state-recomposition","Kt Jetpack Compose State Recomposition",{"key":65,"name":66,"count":11},"kt-kotlin-coroutines-flow","Kt Kotlin Coroutines Flow",{"key":68,"name":69,"count":11},"kt-kotlin-type-system-null-safety","Kt Kotlin Type System Null Safety",{"key":71,"name":72,"count":11},"mobile-distribution-ci","Mobile Distribution Ci",{"key":74,"name":75,"count":11},"mobile-navigation","Mobile Navigation",{"key":77,"name":78,"count":11},"mobile-networking-offline","Mobile Networking Offline",{"key":80,"name":81,"count":11},"mobile-performance-battery","Mobile Performance Battery",{"key":83,"name":84,"count":11},"mobile-security-storage","Mobile Security Storage",{"key":86,"name":87,"count":11},"mobile-state-data","Mobile State Data",{"key":89,"name":90,"count":11},"mobile-testing-automation","Mobile Testing Automation",{"key":92,"name":93,"count":11},"mobile-ui-lifecycle","Mobile Ui Lifecycle",{"key":95,"name":96,"count":11},"rn-javascript-typescript-fundamentals","Rn Javascript Typescript Fundamentals",{"key":98,"name":99,"count":11},"rn-native-bridge-modules","Rn Native Bridge Modules",{"key":101,"name":102,"count":11},"rn-navigation-lifecycle","Rn Navigation Lifecycle",{"key":104,"name":105,"count":11},"rn-networking-persistence-offline","Rn Networking Persistence Offline",{"key":107,"name":108,"count":11},"rn-performance-rendering","Rn Performance Rendering",{"key":110,"name":111,"count":11},"rn-react-hooks-state-management","Rn React Hooks State Management",[113,117,120,123],{"key":114,"name":115,"count":116},"android-kotlin","Android (Kotlin)",450,{"key":118,"name":119,"count":116},"flutter","Flutter",{"key":121,"name":122,"count":116},"ios-swift","iOS (Swift)",{"key":124,"name":125,"count":116},"react-native","React Native",[127,145,158,171,185,198],{"id":128,"topic":9,"difficulty":129,"body":130,"options":131,"correct_key":139,"explanation":144},"019fa93e-4e04-7b39-b11a-1e3891abfe90",1,"In Dart's sound null safety, what does appending `?` to a type like `String?` mean?",[132,135,138,141],{"key":133,"text":134},"a","The variable is nullable only inside async functions.",{"key":136,"text":137},"b","The variable is optional and can be omitted entirely from the class.",{"key":139,"text":140},"c","The variable can hold either a `String` value or `null`.",{"key":142,"text":143},"d","The variable must be assigned before the constructor body runs.","A `?` suffix on a type marks it nullable; without it (e.g. `String`), the compiler guarantees the variable can never hold `null`, and this is enforced at compile time.",{"id":146,"topic":9,"difficulty":129,"body":147,"options":148,"correct_key":142,"explanation":157},"019fa93e-4e05-774a-88bb-4fc798be7e10","```dart\nString? name;\nprint(name?.length);\n```\nWhat happens when `name` is `null`?",[149,151,153,155],{"key":133,"text":150},"It prints `0`, since `length` defaults to zero for null strings.",{"key":136,"text":152},"The program fails to compile because `length` isn't defined on `null`.",{"key":139,"text":154},"A `NoSuchMethodError` is thrown at runtime.",{"key":142,"text":156},"`null` is printed, no exception is thrown.","The `?.` operator short-circuits: if the receiver is `null`, the whole expression evaluates to `null` instead of invoking the member, so no error occurs.",{"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```\nWhat does the `??` operator do here?",[162,164,166,168],{"key":133,"text":163},"It throws an exception if `maybeCount` is not `null`.",{"key":136,"text":165},"It assigns `0` to `count` if `maybeCount` is `null`, otherwise the value of `maybeCount`.",{"key":139,"text":167},"It compares `maybeCount` to `0` and returns a boolean.",{"key":142,"text":169},"It only works when both operands are the exact same nullable type.","`??` is the null-coalescing operator: it evaluates the left side, and if that is `null`, falls back to the right-side expression.",{"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```\nWhat happens when `name` is `null`?",[176,178,180,182],{"key":133,"text":177},"It silently returns `0` for `length`.",{"key":136,"text":179},"A runtime exception is thrown because `!` asserted non-null but the value is `null`.",{"key":139,"text":181},"It compiles to a no-op and prints nothing.",{"key":142,"text":183},"The compiler rejects this code before it can run.","The `!` (bang) operator tells the compiler \"trust me, this is non-null\" and casts away nullability at compile time; if the value is actually `null` at runtime, it throws a `TypeError`\u002Fnull-check exception.",{"id":186,"topic":9,"difficulty":173,"body":187,"options":188,"correct_key":139,"explanation":197},"019fa93e-4e07-7834-8e31-4192f4014a39","What is the purpose of the `late` keyword on a non-nullable field like `late String name;`?",[189,191,193,195],{"key":133,"text":190},"It makes the field nullable so it can be left unassigned safely.",{"key":136,"text":192},"It marks the field as computed lazily only inside `const` constructors.",{"key":139,"text":194},"It defers the non-null check to first-use time instead of declaration\u002Fconstructor time.",{"key":142,"text":196},"It forces the field to be re-evaluated every time it is read.","`late` lets a variable be non-nullable while its initialization happens later (e.g. set in `initState`); the compiler trusts that it will be assigned before first read, and throws a `LateInitializationError` at runtime if that trust is broken.",{"id":199,"topic":9,"difficulty":129,"body":200,"options":201,"correct_key":142,"explanation":210},"019fa93e-4e0b-7228-8da9-a29b8d58549e","Why does marking a named constructor parameter `required` matter in a class with nullable fields?",[202,204,206,208],{"key":133,"text":203},"It is only valid on positional parameters, not named ones.",{"key":136,"text":205},"It automatically makes the parameter's type non-nullable regardless of its declared type.",{"key":139,"text":207},"It only affects documentation\u002FIDE hints and has no compile-time effect.",{"key":142,"text":209},"It forces callers to pass the argument, even if otherwise optional as named.","`required` is orthogonal to nullability: a named parameter can be `required` and still nullable (`required int? x`), or optional and non-nullable (with a default). `required` only enforces that the call site supplies the argument.",{"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":332,"name_en":6,"sort":333,"specializations":334},"Mobil",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},[395,10],"tr",[397,398],"google","github",21750,true]