libuv Basics Quiz

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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?

DNS operations. (C) Signup and view all the answers

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

Event Loop. (B) Signup and view all the answers

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

Asynchronous operations. (D) Signup and view all the answers

Which programming language is libuv primarily written in?

C. (B) Signup and view all the answers

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

Handling file system operations. (B) Signup and view all the answers

What happens when a signal value changes in an effect?

The effect is re-executed. (A) Signup and view all the answers

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

Only once for all signals. (A) Signup and view all the answers

In what context must an effect be defined?

In a directive or component. (D) Signup and view all the answers

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

To avoid including a signal in the dependency tree. (C) Signup and view all the answers

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

It is executed during change detection. (C) Signup and view all the answers

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

Options object such as injector. (C) Signup and view all the answers

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

The signal will be excluded from future effects. (A) Signup and view all the answers

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

Hierarchical system with component and module injectors (C) Signup and view all the answers

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

It will execute automatically during change detection. (B) Signup and view all the answers

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

Event Binding (D) Signup and view all the answers

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

Component injector hierarchy (C) Signup and view all the answers

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

@Output (A) Signup and view all the answers

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

Injector tree (D) Signup and view all the answers

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

It looks in the module hierarchy (A) Signup and view all the answers

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

Increases the value by 1 (B) Signup and view all the answers

How can the ModuleInjector identify available providers?

Through a recursive flattening of all provider arrays (A) Signup and view all the answers

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

To hold the current value to be emitted (C) Signup and view all the answers

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

To notify the parent of the value change (A) Signup and view all the answers

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

@Injectable property (D) Signup and view all the answers

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

It can only transmit string values. (D) Signup and view all the answers

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

CvService (C) Signup and view all the answers

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

The data passed from the child component (C) Signup and view all the answers

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

The CV is added to the list of hired individuals (A) Signup and view all the answers

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

To add metadata to an Angular component (B) Signup and view all the answers

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

To emit events from the child component to the parent (C) Signup and view all the answers

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

emit() (D) Signup and view all the answers

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

It is better integrated with RxJS (D) Signup and view all the answers

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

It increments 'valeur' and emits the updated value (A) Signup and view all the answers

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

Any type of data (C) Signup and view all the answers

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

@Component (D) Signup and view all the answers

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

It simplifies syntax and enhances safety (D) Signup and view all the answers

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

To emit asynchronous events to subscribers (D) Signup and view all the answers

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

It allows tree-shaking of unused services, removing their code from the final build. (C) Signup and view all the answers

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

Update a Todo (B) Signup and view all the answers

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

A constant value, an external library, or a mock object. (A) Signup and view all the answers

In which scenario would you typically need a custom provider?

To inject an instance depending on the user's role. (D) Signup and view all the answers

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

Using the @Inject decorator with the appropriate token. (D) Signup and view all the answers

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

Update an existing Todo (B) Signup and view all the answers

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

To replace a real implementation with a mock for testing. (A) Signup and view all the answers

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

providers (B) Signup and view all the answers

What is libuv?

A cross-platform library written in C primarily used in Node.js to manage asynchronous I/O operations.

What is the Event Loop in libuv?

A core component of libuv that manages asynchronous tasks by scheduling and executing them in an efficient manner. It uses a single thread to process events and delegate tasks to other threads.

What is the Thread Pool in libuv?

A collection of worker threads in libuv, used to offload asynchronous tasks like file management and network communication to the operating system.

How many threads are in the Thread Pool by default?

The number of threads in the Thread Pool can be controlled by the environment variable UV_THREADPOOL_SIZE. By default, it's 4, but can be extended up to 128.