libuv Basics Quiz
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Questions and Answers

What is the primary role of libuv?

  • To manage asynchronous I/O operations. (correct)
  • To connect different programming languages.
  • To manage web server configurations.
  • To handle synchronous I/O operations.

    • How many threads does the thread pool in libuv support by default?

  • 4 (correct)
  • 16
  • 8
  • 2

    • What must be modified to change the size of the thread pool in libuv?

  • Recompile the libuv library.
  • Update the package settings.
  • Set the UV_THREADPOOL_SIZE environment variable. (correct)
  • Change the Node.js version.

    • Which of the following operations does the thread pool in libuv handle?

    <p>DNS operations.</p> Signup and view all the answers

    What is the main component of Node.js that libuv manages for asynchronous processing?

    <p>Event Loop.</p> Signup and view all the answers

    What type of operations does libuv delegate to the operating system when possible?

    <p>Asynchronous operations.</p> Signup and view all the answers

    Which programming language is libuv primarily written in?

    <p>C.</p> Signup and view all the answers

    What is one of the primary functions of the thread pool in libuv?

    <p>Handling file system operations.</p> Signup and view all the answers

    What happens when a signal value changes in an effect?

    <p>The effect is re-executed.</p> Signup and view all the answers

    How many times will an effect be executed if multiple signals change at the same time?

    <p>Only once for all signals.</p> Signup and view all the answers

    In what context must an effect be defined?

    <p>In a directive or component.</p> Signup and view all the answers

    What can the API untracked be used for in relation to a signal?

    <p>To avoid including a signal in the dependency tree.</p> Signup and view all the answers

    Which statement correctly describes the nature of the API effect()?

    <p>It is executed during change detection.</p> Signup and view all the answers

    What does the second parameter of the effect() function represent?

    <p>Options object such as injector.</p> Signup and view all the answers

    What will happen to a signal if its related effect is placed in an untracked environment?

    <p>The signal will be excluded from future effects.</p> Signup and view all the answers

    What is the primary structure of Angular's dependency injection system?

    <p>Hierarchical system with component and module injectors</p> Signup and view all the answers

    What indicates a proper use of the effect() API regarding its execution?

    <p>It will execute automatically during change detection.</p> Signup and view all the answers

    What type of binding is used when emitting an event from a child component to a parent component?

    <p>Event Binding</p> Signup and view all the answers

    Which injector hierarchy has the highest priority in Angular's dependency injection system?

    <p>Component injector hierarchy</p> Signup and view all the answers

    Which decorator is used to define an event emitter in an Angular component?

    <p>@Output</p> Signup and view all the answers

    What is created that mirrors the component tree in Angular's dependency injection?

    <p>Injector tree</p> Signup and view all the answers

    What happens if Angular does not find a provider in the component hierarchy?

    <p>It looks in the module hierarchy</p> Signup and view all the answers

    What does the method 'incrementer()' do in the OutputComponent?

    <p>Increases the value by 1</p> Signup and view all the answers

    How can the ModuleInjector identify available providers?

    <p>Through a recursive flattening of all provider arrays</p> Signup and view all the answers

    In the context provided, what is the purpose of the variable 'valeur' in the OutputComponent?

    <p>To hold the current value to be emitted</p> Signup and view all the answers

    What is the function of the statement 'this.valueChange.emit(this.valeur);'?

    <p>To notify the parent of the value change</p> Signup and view all the answers

    What property can be used to reference a NgModule in the ModuleInjector?

    <p>@Injectable property</p> Signup and view all the answers

    Which of the following is NOT a characteristic of the event emitter in Angular?

    <p>It can only transmit string values.</p> Signup and view all the answers

    What new service is suggested to manage CVs in the hiring platform?

    <p>CvService</p> Signup and view all the answers

    What does the variable '$event' represent in Angular's event handling?

    <p>The data passed from the child component</p> Signup and view all the answers

    What action occurs when the 'hire' button is clicked on a CV according to the outlined exercise?

    <p>The CV is added to the list of hired individuals</p> Signup and view all the answers

    What is the purpose of the @Component decorator in Angular?

    <p>To add metadata to an Angular component</p> Signup and view all the answers

    What is the purpose of the @Output() decorator in Angular components?

    <p>To emit events from the child component to the parent</p> Signup and view all the answers

    Which method is used to emit the new value in the event of a change?

    <p>emit()</p> Signup and view all the answers

    What does the output() API provide in comparison to the traditional @Output() decorator?

    <p>It is better integrated with RxJS</p> Signup and view all the answers

    In the given code, which statement correctly represents the incrementer() function's role?

    <p>It increments 'valeur' and emits the updated value</p> Signup and view all the answers

    What type of value does the variable 'result' hold in the AppComponent?

    <p>Any type of data</p> Signup and view all the answers

    Which Angular decorator is used to mark a class as a component?

    <p>@Component</p> Signup and view all the answers

    What is the primary advantage of using the output() API over the traditional @Output() decorator?

    <p>It simplifies syntax and enhances safety</p> Signup and view all the answers

    In the context of Angular components, what is an EventEmitter used for?

    <p>To emit asynchronous events to subscribers</p> Signup and view all the answers

    What is the primary advantage of using 'providedIn' for services?

    <p>It allows tree-shaking of unused services, removing their code from the final build.</p> Signup and view all the answers

    Which of the following methods does the Todo service NOT provide?

    <p>Update a Todo</p> Signup and view all the answers

    What does the 'useValue' syntax allow you to inject?

    <p>A constant value, an external library, or a mock object.</p> Signup and view all the answers

    In which scenario would you typically need a custom provider?

    <p>To inject an instance depending on the user's role.</p> Signup and view all the answers

    How should you inject a provider that uses the 'useValue' syntax?

    <p>Using the @Inject decorator with the appropriate token.</p> Signup and view all the answers

    Which of the following is NOT a function of the Todo service described?

    <p>Update an existing Todo</p> Signup and view all the answers

    What is one reason to create a custom provider in Angular?

    <p>To replace a real implementation with a mock for testing.</p> Signup and view all the answers

    What keyword is used to specify which services should be available in the Angular dependency injection?

    <p>providers</p> Signup and view all the answers

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