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It is unrelated to `@Component` (view classes) or to being specifically a guard\u002Finterceptor — those are separate roles a class can additionally take on.",{"id":170,"topic":9,"difficulty":153,"body":171,"options":172,"correct_key":160,"explanation":181},"019f79bd-9017-7eeb-831b-ec4946596da9","What does `providedIn: 'root'` mean when configuring `@Injectable()`?",[173,175,177,179],{"key":157,"text":174},"The service is only usable inside components declared by `AppModule`",{"key":160,"text":176},"The root injector provides one shared service instance",{"key":163,"text":178},"The service must still be manually listed in a module's `providers` array",{"key":166,"text":180},"The service is scoped only to lazy-loaded feature modules","`providedIn: 'root'` tells Angular's compiler to register the provider with the root injector automatically, without needing it in any module's `providers` array. The service becomes a singleton shared across the whole app, and if nothing ever injects it, the bundler can tree-shake it away.",{"id":183,"topic":9,"difficulty":153,"body":184,"options":185,"correct_key":163,"explanation":194},"019f79bd-901a-7342-9503-2c70b89482a5","How does an Angular component typically receive an instance of an injectable service?",[186,188,190,192],{"key":157,"text":187},"By calling `new ServiceName()` directly inside the component",{"key":160,"text":189},"By importing the service class into the HTML template",{"key":163,"text":191},"By using its type as a constructor parameter",{"key":166,"text":193},"By assigning it to a static property on the component class","Angular's DI resolves constructor parameter types and supplies matching instances automatically — this is constructor injection, the standard pattern. Calling `new` directly bypasses DI entirely, losing singleton behavior and the injector hierarchy.",{"id":196,"topic":9,"difficulty":153,"body":197,"options":198,"correct_key":166,"explanation":207},"019f79bd-901a-7c5f-b940-4657e190c270","If a service is injected somewhere but no injector in the chain has a provider for it (and it has no `providedIn`), what happens?",[199,201,203,205],{"key":157,"text":200},"Angular silently injects `null`",{"key":160,"text":202},"Angular creates a default empty instance automatically",{"key":163,"text":204},"The component renders normally, ignoring the missing dependency",{"key":166,"text":206},"Angular throws a `NullInjectorError` at runtime","Angular's DI resolves the token by walking up the injector tree; if no injector along that path (and no `providedIn`) has a provider for it, resolution fails and Angular throws a `NullInjectorError`, naming the missing token.",{"id":209,"topic":9,"difficulty":153,"body":210,"options":211,"correct_key":157,"explanation":220},"019f79bd-901b-773b-ad4a-073898e8462d","```typescript\n@Injectable({ providedIn: 'root' })\nexport class LoggerService {\n  log(msg: string) { console.log(msg); }\n}\n\n@Component({ selector: 'app-root', template: '' })\nexport class AppComponent {\n  constructor(private logger: LoggerService) {}\n}\n```\nWhat creates the `LoggerService` instance that `AppComponent` receives here?",[212,214,216,218],{"key":157,"text":213},"Angular's injector, using the constructor parameter type",{"key":160,"text":215},"The component's template, during its first render",{"key":163,"text":217},"A manual `new LoggerService()` call generated behind the scenes",{"key":166,"text":219},"The `@Component` decorator's `providers` array, which is required for this to work","Because `LoggerService` uses `providedIn: 'root'`, Angular's root injector already has a provider for it; the DI system reads the type of the `logger` constructor parameter and supplies the singleton instance automatically — no `providers` array on `@Component` is needed.",{"id":222,"topic":9,"difficulty":153,"body":223,"options":224,"correct_key":160,"explanation":233},"019f79bd-901c-7206-9739-64f39171d6d9","Angular has a hierarchical injector system. What does this mean at a basic level?",[225,227,229,231],{"key":157,"text":226},"Only one single injector exists for the whole application, at the root",{"key":160,"text":228},"Dependency lookup walks from local injectors toward ancestor injectors",{"key":163,"text":230},"Every call to inject a dependency creates a brand-new, isolated injector",{"key":166,"text":232},"Injector hierarchy only applies to lazy-loaded routing modules","Angular builds a tree of injectors that mirrors the app's structure: a root\u002Fmodule injector plus a per-component 'element injector' for components that declare their own providers. When a dependency is requested, Angular searches starting from the requesting component's injector and walks upward until a provider is found.",{"fields":235,"seniorities":410,"interview_shapes":411,"locales":416,"oauth":418,"question_count":421,"coach_enabled":422,"jd_match_enabled":422},[236,261,270,287,311,324,343,362,384,391,397,404],{"key":237,"name_tr":238,"name_en":238,"sort":153,"specializations":239},"backend","Backend",[240,243,246,249,252,255,258],{"key":241,"name":242,"field":237},"general","Genel",{"key":244,"name":245,"field":237},"go","Go",{"key":247,"name":248,"field":237},"python","Python",{"key":250,"name":251,"field":237},"java","Java",{"key":253,"name":254,"field":237},"csharp","C#\u002F.NET",{"key":256,"name":257,"field":237},"nodejs","Node.js",{"key":259,"name":260,"field":237},"php","PHP",{"key":5,"name_tr":6,"name_en":6,"sort":262,"specializations":263},2,[264,265,266,267,268,269],{"key":241,"name":242,"field":5},{"key":139,"name":140,"field":5},{"key":145,"name":146,"field":5},{"key":142,"name":143,"field":5},{"key":148,"name":149,"field":5},{"key":135,"name":136,"field":5},{"key":271,"name_tr":272,"name_en":272,"sort":273,"specializations":274},"fullstack","Fullstack",3,[275,276,277,278,279,280,281,282,283,284,285,286],{"key":241,"name":242,"field":271},{"key":244,"name":245,"field":237},{"key":247,"name":248,"field":237},{"key":250,"name":251,"field":237},{"key":253,"name":254,"field":237},{"key":256,"name":257,"field":237},{"key":259,"name":260,"field":237},{"key":139,"name":140,"field":5},{"key":145,"name":146,"field":5},{"key":142,"name":143,"field":5},{"key":148,"name":149,"field":5},{"key":135,"name":136,"field":5},{"key":288,"name_tr":289,"name_en":289,"sort":290,"specializations":291},"devops-cloud","DevOps \u002F Cloud",4,[292,293,296,299,302,305,308],{"key":241,"name":242,"field":288},{"key":294,"name":295,"field":288},"aws","AWS",{"key":297,"name":298,"field":288},"gcp","GCP",{"key":300,"name":301,"field":288},"azure","Azure",{"key":303,"name":304,"field":288},"kubernetes","Kubernetes",{"key":306,"name":307,"field":288},"terraform","Terraform",{"key":309,"name":310,"field":288},"linux","Linux",{"key":312,"name_tr":313,"name_en":313,"sort":314,"specializations":315},"ai-engineer","AI Engineer",5,[316,317,318,321],{"key":241,"name":242,"field":312},{"key":247,"name":248,"field":312},{"key":319,"name":320,"field":312},"llm-rag","LLM\u002FRAG",{"key":322,"name":323,"field":312},"mlops","MLOps",{"key":325,"name_tr":326,"name_en":327,"sort":328,"specializations":329},"database","Veritabanı","Database",6,[330,331,334,337,340],{"key":241,"name":242,"field":325},{"key":332,"name":333,"field":325},"postgresql","PostgreSQL",{"key":335,"name":336,"field":325},"mysql","MySQL",{"key":338,"name":339,"field":325},"mongodb","MongoDB",{"key":341,"name":342,"field":325},"redis","Redis",{"key":344,"name_tr":345,"name_en":346,"sort":347,"specializations":348},"mobile","Mobil","Mobile",7,[349,350,353,356,359],{"key":241,"name":242,"field":344},{"key":351,"name":352,"field":344},"ios-swift","iOS (Swift)",{"key":354,"name":355,"field":344},"android-kotlin","Android (Kotlin)",{"key":357,"name":358,"field":344},"flutter","Flutter",{"key":360,"name":361,"field":344},"react-native","React Native",{"key":363,"name_tr":364,"name_en":365,"sort":366,"specializations":367},"security","Güvenlik","Security",8,[368,369,372,375,378,381],{"key":241,"name":242,"field":363},{"key":370,"name":371,"field":363},"appsec","AppSec",{"key":373,"name":374,"field":363},"offensive-pentest","Offensive \u002F Pentest",{"key":376,"name":377,"field":363},"cloud-security","Cloud Security",{"key":379,"name":380,"field":363},"devsecops","DevSecOps",{"key":382,"name":383,"field":363},"blue-team-incident","Blue Team \u002F Incident",{"key":385,"name_tr":386,"name_en":387,"sort":388,"specializations":389},"qa-test-automation","QA \u002F Test Otomasyonu","QA \u002F Test Automation",9,[390],{"key":241,"name":242,"field":385},{"key":392,"name_tr":393,"name_en":393,"sort":394,"specializations":395},"data-engineer","Data Engineer",10,[396],{"key":241,"name":242,"field":392},{"key":398,"name_tr":399,"name_en":400,"sort":401,"specializations":402},"game-dev","Oyun Geliştirme","Game Development",11,[403],{"key":241,"name":242,"field":398},{"key":405,"name_tr":406,"name_en":406,"sort":407,"specializations":408},"ml-engineer","ML Engineer",12,[409],{"key":241,"name":242,"field":405},[14,15,16],{"junior":412,"mid":414,"senior":415},{"questions":413,"median_sec":3},20,{"questions":413,"median_sec":3},{"questions":413,"median_sec":3},[417,10],"tr",[419,420],"google","github",21750,true]