service_container.yaml

questions:
  -
    uuid: 1eebf878-8b96-6fe4-bbf2-99d84c92580c
    question: 'Could a parameter be removed from a Symfony\Component\DependencyInjection\ParameterBag\ContainerBag?'
    answers:
      - { value: 'Yes', correct: false }
      - { value: 'No', correct: true }
    help: 'https://github.com/symfony/symfony/blob/6.4/src/Symfony/Component/DependencyInjection/ParameterBag/ContainerBag.php'
  -
    uuid: 1eebf878-8b98-60e2-8300-99d84c92580c
    question: 'What is the default priority used when adding a new compiler pass?'
    answers:
      - { value: '0', correct: true }
      - { value: '10', correct: false }
      - { value: '1000', correct: false }
      - { value: '-255', correct: false }
      - { value: '100', correct: false }
    help: 'https://symfony.com/doc/current/components/dependency_injection/compilation.html#controlling-the-pass-ordering'
  -
    uuid: 1eebf878-8b98-6344-9f43-99d84c92580c
    question: "Let's assume, we have a private service my_private_service. Will this work ? $container->get('my_private_service');"
    answers:
      - { value: 'Yes', correct: false }
      - { value: 'No', correct: true }
    help: 'https://symfony.com/doc/current/service_container/alias_private.html'
  -
    uuid: 1eebf878-8b98-65d8-89f3-99d84c92580c
    question: 'Which of the following sentences are true about synthetic services?'
    answers:
      - { value: 'Third-party services cannot be registered as synthetic.', correct: false }
      - { value: 'The kernel service is synthetic.', correct: true }
      - { value: 'They are injected into the container instead of being created by the container.', correct: true }
      - { value: 'They cannot be injected into another services.', correct: false }
    help: 'https://symfony.com/doc/current/service_container/synthetic_services.html'
  -
    uuid: 1eebf878-8b98-661e-af6f-99d84c92580c
    question: 'Could the number of time each environment variables has been resolved be obtained when using ContainerBuilder?'
    answers:
      - { value: 'Yes', correct: true }
      - { value: 'No', correct: false }
    help: 'https://github.com/symfony/symfony/blob/6.3/src/Symfony/Component/DependencyInjection/ContainerBuilder.php#L1485'
  -
    uuid: 1eebf878-8b98-6786-a236-99d84c92580c
    question: 'What is true about ContainerConfigurator?'
    answers:
      - { value: "it's an internal class that you should not use in your application", correct: false }
      - { value: 'it allows to work with service definitions', correct: true }
      - { value: "it doesn't exist", correct: false }
      - { value: 'it allows to configure a service after its instanciation', correct: false }
    help: 'https://symfony.com/doc/current/service_container.html'
  -
    uuid: 1eebf878-8b98-68b2-8f41-99d84c92580c
    question: 'Could an EnvPlaceholderParameterBag be merged into another one?'
    answers:
      - { value: 'Yes', correct: true }
      - { value: 'No', correct: false }
    help: 'https://github.com/symfony/symfony/blob/6.3/src/Symfony/Component/DependencyInjection/ParameterBag/EnvPlaceholderParameterBag.php#L103'
  -
    uuid: 1eebf878-8b98-6ce0-93de-99d84c92580c
    question: 'Will Autowiring automatically inject dependencies of an autowired service?'
    answers:
      - { value: 'Yes, autowiring will find and register all dependencies', correct: false }
      - { value: 'Yes, if dependencies are explicitly declared as autowired or manually configured.', correct: true }
      - { value: 'No', correct: false }
    help: 'https://symfony.com/doc/current/service_container/autowiring.html'
  -
    uuid: 1eebf878-8b99-65e6-9c14-99d84c92580c
    question: 'Could parameters be cleared from a ContainerParameterBag?'
    answers:
      - { value: 'Yes', correct: false }
      - { value: 'No', correct: true }
    help: 'https://github.com/symfony/symfony/blob/6.3/src/Symfony/Component/DependencyInjection/ParameterBag/ContainerBag.php'
  -
    uuid: 1eebf878-8b99-6884-ba5f-99d84c92580c
    question: 'Which sentences are true about compiler pass registration ?'
    answers:
      - { value: 'When a compiler pass is registered, you can chose the step where it will be executed. 6 steps are available', correct: false }
      - { value: 'When a compiler pass is registered, you can chose the step where it will be executed. 5 steps are available', correct: false }
      - { value: 'Compiler pass are automatically registered if they implement CompilerPassInterface and autoconfigure is set to true', correct: true }
      - { value: 'Compiler pass can be registered in the build method of the Kernel', correct: true }
      - { value: 'When a compiler pass is registered, you can chose the step where it will be executed. 4 steps are available', correct: false }
    help: 'https://symfony.com/doc/current/components/dependency_injection/compilation.html'
  -
    uuid: 1eebf878-8b99-68ca-8cdb-99d84c92580c
    question: 'Which of the following statements are true about the so-called compiler passes?'
    answers:
      - { value: 'They check that all registered services definitions are valid and some required global parameters are not missing.', correct: true }
      - { value: 'They prevent the ContainerBuilder object from being compiled if they detect any circular references in services definitions.', correct: true }
      - { value: 'They are always triggered on every HTTP requests made to the Symfony application.', correct: false }
      - { value: 'They perform some optimization operations on a ContainerBuilder instance in order to generate the most efficient PHP code possible.', correct: true }
      - { value: 'They allow to add, alter or remove any services definitions of a ContainerBuilder object.', correct: true }
    help: 'https://symfony.com/doc/current/service_container/compiler_passes.html#main'
  -
    uuid: 1eebf878-8b99-691a-a06d-99d84c92580c
    question: 'Which of the followings are not part of the built-in loaders?'
    answers:
      - { value: JsonLoader, correct: true }
      - { value: CsvLoader, correct: true }
      - { value: PoFileLoader, correct: false }
      - { value: MoFileLoader, correct: false }
      - { value: JsonFileLoader, correct: false }
      - { value: ArrayLoader, correct: false }
      - { value: PhpFileLoader, correct: false }
      - { value: CsvFileLoader, correct: false }
      - { value: QtFileLoader, correct: false }
    help: 'https://github.com/symfony/translation/tree/2.8/Loader'
  -
    uuid: 1eebf878-8b9a-6266-96a4-99d84c92580c
    question: 'Is it possible to create a service that is not publicly accessible?'
    answers:
      - { value: 'Yes', correct: true }
      - { value: 'No', correct: false }
    help: 'https://symfony.com/doc/current/service_container/alias_private.html#marking-services-as-public-private'
  -
    uuid: 1eebf878-8b9a-69be-97e2-99d84c92580c
    question: 'Is it possible to use a constant in a parameter?'
    answers:
      - { value: 'Yes in XML format', correct: true }
      - { value: 'No', correct: false }
      - { value: 'Yes, in PHP', correct: true }
      - { value: 'Yes, in the YAML format (thanks to the expression language component)', correct: true }
    help: 'https://symfony.com/doc/current/configuration.html#constants-as-parameters'
  -
    uuid: 1eebf878-8b9a-6a0e-9c3a-99d84c92580c
    question: 'Can you inject a dependency to a service without passing it to the constructor?'
    answers:
      - { value: 'Yes', correct: true }
      - { value: 'No', correct: false }
    help: 'https://symfony.com/doc/current/service_container/injection_types.html'
  -
    uuid: 1eebf878-8b9a-6c0c-89ff-99d84c92580c
    question: 'What is a "Service Configurator" in Symfony?'
    answers:
      - { value: "It's a Symfony built-in service that can be obtained as $container->get('configurator')", correct: false }
      - { value: "There's no such a thing in Symfony's Dependency Injection component.", correct: false }
      - { value: "It's a feature of the Dependency Injection component that allows to apply some configuration logic to all the services that define a specific tag.", correct: false }
      - { value: "It's a PHP callable that you can optionally execute to configure a Symfony service after its instantiation.", correct: true }
    help: 'https://symfony.com/doc/current/service_container/configurators.html'
  -
    uuid: 1eebf878-8b9a-6c5c-ac18-99d84c92580c
    question: 'Could a ParameterBag be frozen?'
    answers:
      - { value: 'Yes', correct: true }
      - { value: 'No', correct: false }
    help: 'https://github.com/symfony/symfony/blob/6.4/src/Symfony/Component/DependencyInjection/ParameterBag/FrozenParameterBag.php'
  -
    uuid: 1eebf878-8b9b-6030-b99f-99d84c92580c
    question: 'What is the way to add a loader to the translator?'
    answers:
      - { value: '$translator->addArrayLoader(new ArrayLoader());', correct: false }
      - { value: "$translator->addLoader('array', new ArrayLoader());", correct: true }
      - { value: '$translator->addLoader(new ArrayLoader());', correct: false }
      - { value: "$translator->addLoader(new ArrayLoader(), 'array');", correct: false }
    help: 'https://symfony.com/doc/current/components/translation.html#loading-message-catalogs'
  -
    uuid: 1eebf878-8b9b-6288-afdc-99d84c92580c
    question: 'What is the purpose of the autowire configuration flag in a service definition?'
    answers:
      - { value: 'It allows to get ride of the a circular reference error for the service.', correct: false }
      - { value: "It allows implicit dependencies registration based on the service constructor's typehint.", correct: true }
      - { value: 'It allows the service to be automatically called on some kernel events.', correct: false }
    help: 'https://symfony.com/doc/current/components/dependency_injection/autowiring.html'
  -
    uuid: 1eebf878-8b9c-61b0-ab03-99d84c92580c
    question: 'Could new parameters be added into a Symfony\Component\DependencyInjection\ParameterBag\ContainerBag?'
    answers:
      - { value: 'Yes', correct: false }
      - { value: 'No', correct: true }
    help: 'https://github.com/symfony/symfony/blob/6.3/src/Symfony/Component/DependencyInjection/ParameterBag/ContainerBag.php'
  -
    uuid: 1eebf878-8b9c-6516-83f6-99d84c92580c
    question: 'Does service ids considered as case-sensitive?'
    answers:
      - { value: 'Yes', correct: false }
      - { value: 'No', correct: true }
    help: 'https://github.com/symfony/symfony/blob/2.0/src/Symfony/Component/DependencyInjection/Container.php#L221'
  -
    uuid: 1eebf878-8b9d-6330-b506-99d84c92580c
    question: 'Could service configurators use __invoke() to configure a service?'
    answers:
      - { value: 'Yes', correct: true }
      - { value: 'No', correct: false }
    help: 'https://symfony.com/doc/current/service_container/configurators.html#using-the-configurator'
  -
    uuid: 1eebf878-8b9d-6826-a51d-99d84c92580c
    question: 'Could a parameter be removed from a FrozenParameterBag?'
    answers:
      - { value: 'Yes', correct: false }
      - { value: 'No', correct: true }
    help: 'https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/DependencyInjection/ParameterBag/FrozenParameterBag.php'
  -
    uuid: 1eebf878-8b9d-68bc-8b85-99d84c92580c
    question: 'Could imports be configured using ContainerConfigurator?'
    answers:
      - { value: 'Yes', correct: true }
      - { value: 'No', correct: false }
    help: 'https://github.com/symfony/dependency-injection/blob/8126f0be4ff984e4db0140e60917900a53facb49/Loader/Configurator/ContainerConfigurator.php#L68'
  -
    uuid: 1eebf878-8b9f-62de-9af3-99d84c92580c
    question: 'Which types of injection are available in the component?'
    answers:
      - { value: constructor, correct: true }
      - { value: property, correct: true }
      - { value: setter, correct: true }
      - { value: immutable-property, correct: false }
      - { value: immutable-setter, correct: true }
      - { value: constant, correct: false }
      - { value: getter, correct: false }
    help: 'https://symfony.com/doc/current/service_container/injection_types.html'
  -
    uuid: 1eebf878-8b9f-636a-8ea3-99d84c92580c
    question: 'When implementing Command pattern, the use of Service Subscriber is another lazy loading implementation. Which of the following statement is true ?'
    answers:
      - { value: 'Your implementation must implement ServiceSubscriberInterface', correct: true }
      - { value: 'Static method getSubscribedServices shall be implemented and listed services can be indexed with your own keys', correct: true }
      - { value: 'Static method getSubscribedServices shall be implemented and listed services canot be indexed with your own keys', correct: false }
      - { value: 'ContainerInterface must be injected in your implementation', correct: true }
      - { value: 'Service locator is a subset of service container', correct: true }
    help: 'https://symfony.com/doc/current/service_container/service_subscribers_locators.html#defining-a-service-subscriber'
  -
    uuid: 1eebf878-8b9f-63ba-b1d8-99d84c92580c
    question: 'Which of the following statements are true about autowiring ?'
    answers:
      - { value: 'Symfony basic configuration comes with autowire set to true', correct: true }
      - { value: 'Type-hinting is used to map the correct services from the service container, using type-hinting as service id', correct: true }
      - { value: 'Autowiring can be used in the __construct() method as well as in all other methods of the service', correct: true }
      - { value: 'Autowiring can only be used in the __construct() method of the service', correct: false }
    help: 'https://symfony.com/doc/current/service_container/autowiring.html'
  -
    uuid: 1eebf878-8b9f-6400-9572-99d84c92580c
    question: 'Which of the following factory design pattern are available for service container defintion ?'
    answers:
      - { value: 'Static factories', correct: true }
      - { value: 'Non-Static factories', correct: true }
      - { value: 'Dynamic factories', correct: false }
      - { value: 'Invokable factories', correct: true }
      - { value: 'Clonable factories', correct: false }
    help: 'https://symfony.com/doc/current/service_container/factories.html'
  -
    uuid: 1eebf878-8b9f-648c-b082-99d84c92580c
    question: 'Using Dependency Injection, what is the correct way to override a service class using ContainerBuilder class?'
    answers:
      - { value: "$container->getDefinition('my.service')->setClass('My\\Service\\Class')", correct: true }
      - { value: "$container->getService('my.service')->setDefinition('My\\Service\\Class')", correct: false }
      - { value: "$container->getDefinition('my.service')->setService('My\\Service\\Class')", correct: false }
      - { value: "$container->getService('my.service')->setClass('My\\Service\\Class')", correct: false }
    help: 'https://symfony.com/doc/current/service_container/definitions.html'
  -
    uuid: 1eebf878-8b9f-65f4-aca1-99d84c92580c
    question: 'Can configuration parameters in Symfony contain array values, such as in the parameters section of config/services.yaml?'
    answers:
      - { value: 'true', correct: true }
      - { value: 'false', correct: false }
    help: 'https://symfony.com/doc/current/configuration.html#configuration-parameters'
  -
    uuid: 1eebf878-8b9f-670c-beb7-99d84c92580c
    question: "With default configuration each time you retrieve the service, you'll get the same instance ?"
    answers:
      - { value: 'true', correct: true }
      - { value: 'false', correct: false }
    help: 'https://symfony.com/doc/current/service_container.html#creating-configuring-services-in-the-container'
  -
    uuid: 1eebf878-8b9f-6752-a151-99d84c92580c
    question: 'What is the correct load() method definition in Symfony\Component\DependencyInjection\Extension\ExtensionInterface?'
    answers:
      - { value: 'public function load(array $configs, ContainerBuilder $container)', correct: true }
      - { value: 'public function load(ContainerBuilder $container, array $configs)', correct: false }
    help: 'https://symfony.com/doc/current/components/dependency_injection/compilation.html#managing-configuration-with-extensions'
  -
    uuid: 1eebf878-8b9f-67a2-ab9f-99d84c92580c
    question: 'Service parameters can be set at runtime'
    answers:
      - { value: 'true', correct: false }
      - { value: 'false', correct: true }
    help: 'https://symfony.com/doc/current/service_container.html#service-parameters'
  -
    uuid: 1eebf878-8ba1-6d72-b87d-99d84c92580c
    question: "Which injection types are supported by the Symfony's DIC?"
    answers:
      - { value: setter, correct: true }
      - { value: constructor, correct: true }
      - { value: property, correct: true }
      - { value: getter, correct: false }
    help: 'https://symfony.com/doc/current/service_container.html'
  -
    uuid: 1eebf878-8ba1-6fb6-af5f-99d84c92580c
    question: 'What is the correct option to add other directories in the translator configuration?'
    answers:
      - { value: "framework:translator:paths:- %kernel.project_dir%/translations'", correct: true }
      - { value: "framework:translator:add_paths:- %kernel.project_dir%/translations'", correct: false }
      - { value: "framework:translator:custom_directories:- %kernel.project_dir%/translations'", correct: false }
      - { value: "framework:translator:directories:- %kernel.project_dir%/translations'", correct: false }
      - { value: "framework:translator:custom_paths:- %kernel.project_dir%/translations'", correct: false }
    help: 'https://symfony.com/doc/current/reference/configuration/framework.html#reference-translator-paths'
  -
    uuid: 1eebf878-8ba2-6056-a6e9-99d84c92580c
    question: 'When creating a service definition using PHP, could the visibility of the service be changed using Symfony\Component\DependencyInjection\Definition::setPublic($boolean) ?'
    answers:
      - { value: 'Yes', correct: true }
      - { value: 'No', correct: false }
    help: 'https://github.com/symfony/symfony/blob/c8418254edd0851181da5384bc2f94434ca0570d/src/Symfony/Component/DependencyInjection/Definition.php#L541'
  -
    uuid: 1ef5c09c-d7c9-6560-8979-85f7277877d1
    question: 'What is a Symfony Service Container?'
    answers:
      - { value: 'A database management tool', correct: false }
      - { value: 'A special object where services are stored', correct: true }
      - { value: 'A logging system', correct: false }
      - { value: 'A caching mechanism', correct: false }
    help: 'https://symfony.com/doc/current/service_container.html'
  -
    uuid: 1ef5c09e-fdaa-6034-8508-a35d6de03e76
    question: 'What is Dependency Injection (DI) in Symfony?'
    answers:
      - { value: 'A way to manually inject code into templates', correct: false }
      - { value: 'A method to provide necessary objects to a class from external sources', correct: true }
      - { value: 'A technique for optimizing database queries', correct: false }
      - { value: 'A way to encrypt user data', correct: false }
    help: 'https://symfony.com/doc/current/service_container.html'
  -
    uuid: 1ef5c0a1-66d6-6f60-9521-f194ab73eb2f
    question: 'How can you load all classes as services automatically inside a specific folder in Symfony?'
    answers:
      - { value: 'By using the autowire: false configuration', correct: false }
      - { value: 'By adding all class names manually in services.yaml', correct: false }
      - { value: 'By setting autowire: true and defining a resource', correct: true }
      - { value: 'By using the configurator tag', correct: false }
    help: 'https://symfony.com/doc/current/service_container.html'
  -
    uuid: 1ef5c0ac-c210-6358-aea3-8f65d65ecf88
    question: 'How can you make a service available only in the "dev" environment?'
    answers:
      - { value: 'By using the autowire: false option.', correct: false }
      - { value: "By adding the #[When(env: 'dev')] attribute to the service class.", correct: true }
      - { value: 'By defining it in the services_test.yaml file.', correct: false }
      - { value: 'By setting the service as public.', correct: false }
    help: 'https://symfony.com/doc/current/service_container.html#limiting-services-to-a-specific-symfony-environment'
  -
    uuid: 1ef5c0af-d817-65b8-8456-919dad88c362
    question: 'Which of the following is NOT a benefit of using the service container?'
    answers:
      - { value: 'Centralizing object construction.', correct: false }
      - { value: 'Improving application performance.', correct: false }
      - { value: 'Allowing services to be shared and reused.', correct: false }
      - { value: 'Making all services public by default.', correct: true }
    help: 'https://symfony.com/doc/current/service_container.html'
  -
    uuid: 1ef5c0b2-fda9-6a80-9f5e-cd37e2e3aa3d
    question: "In the default services.yaml configuration, what does the resource: '../src/' option do?"
    answers:
      - { value: 'It excludes the src/ directory from being used as services.', correct: false }
      - { value: 'It imports all classes in the src/ directory as services.', correct: true }
      - { value: 'It prevents autowiring for all services.', correct: false }
      - { value: 'It makes the classes in the src/Entity directory available as services.', correct: false }
    help: 'https://symfony.com/doc/current/service_container.html'
  -
    uuid: 1ef5c0b9-c808-679e-a4ff-cd4d8904a960
    question: 'What happens if a service is defined as public: false in Symfony?'
    answers:
      - { value: 'It cannot be injected into other services.', correct: false }
      - { value: 'It can only be accessed within the class where it is defined.', correct: false }
      - { value: 'It cannot be accessed directly from the service container.', correct: true }
      - { value: 'It is automatically excluded from autowiring.', correct: false }
    help: 'https://symfony.com/doc/current/service_container.html'
  -
    uuid: 1ef5c0bd-3df5-61ca-b4e6-b73eeabedf7c
    question: 'What does the lazy option in a service definition do?'
    answers:
      - { value: 'It defers the instantiation of the service until it is actually needed.', correct: true }
      - { value: 'It prevents the service from being injected into other services.', correct: false }
      - { value: 'It makes the service available only in the "prod" environment.', correct: false }
    help: 'https://symfony.com/doc/current/service_container/lazy_services.html'
  -
    uuid: 1ef5c0c1-1ac7-64a6-9cbf-45ad2711c61f
    question: 'When would you use the private visibility for a service?'
    answers:
      - { value: 'When you want the service to be accessible from anywhere in the application.', correct: false }
      - { value: 'When the service should be used only internally within other services.', correct: true }
      - { value: 'When the service should not be instantiated at all.', correct: false }
      - { value: 'When the service is no longer needed in the application.', correct: false }
    help: 'https://symfony.com/doc/current/service_container.html'
  -
    uuid: 1ef5c0c3-627f-6c92-8785-2179a55e4fcd
    question: 'What is a service alias in Symfony used for?'
    answers:
      - { value: 'To create a duplicate service with the same functionality.', correct: false }
      - { value: 'To define an alternative name for an existing service.', correct: true }
      - { value: 'To make a service public.', correct: false }
      - { value: 'To remove a service from the service container.', correct: false }
    help: 'https://symfony.com/doc/current/service_container.html'
  -
    uuid: 1ef5c0c5-7d09-6688-87f2-a3540221237e
    question: "Which command is used to view a specific service's configuration and dependencies in Symfony?"
    answers:
      - { value: 'php bin/console service:show [service_name]', correct: false }
      - { value: 'php bin/console debug:container [service_name]', correct: true }
      - { value: 'php bin/console container:inspect [service_name]', correct: false }
      - { value: 'php bin/console debug:services [service_name]', correct: false }
    help: 'https://symfony.com/doc/current/service_container.html'
  -
    uuid: 1ef5c0ce-a7eb-6956-9bc8-1baf552f428a
    question: 'What is a key benefit of the service in Symfony?'
    answers:
      - { value: 'It is automatically created every time it is requested.', correct: false }
      - { value: 'It creates a new instance each time it is called.', correct: false }
      - { value: 'The same instance is returned each time it is requested.', correct: true }
      - { value: 'It is automatically destroyed after each use.', correct: false }
    help: 'https://symfony.com/doc/current/service_container.html#creating-configuring-services-in-the-container'
  -
    uuid: 1ef5c0dc-17f6-6b76-9bb6-93e4d8e83be3
    question: 'In YAML configuration, which keyword is used to define explicit arguments for a service?'
    answers:
      - { value: parameters, correct: false }
      - { value: options, correct: false }
      - { value: values, correct: false }
      - { value: arguments, correct: true }
    help: 'https://symfony.com/doc/current/service_container.html#manually-wiring-arguments'