Node2

Bienvenido al test sobre Node.js

Para comenzar pulsa sobre el botón de Iniciar.
Dispones de 15 minutos para responder el mayor número posible de respuestas correctas.
Las preguntas tendrán una única respuesta correcta.
Si has terminado el test antes del tiempo establecido, pulsa el botón Finalizar para enviarlo.

Para comenzar el test, completa tus datos y pulsa el botón "Siguiente"

Nombre completo

lookup

reverse

resolve4

resolve

p27

creates a text file hello.txt and appends customized text

creates an image file

console logs system information

creates a file named data and append numbers

fork("ps -ef")

exec("ps", "-ef")

exec("ps -ef")

spawn("ps -ef")

p24

server running at port 3000

server running at http://localhost:4000/

server running at http://127.0.0.1:3000/

server running at http://localhost:3000/

p32

undefined

an empty string

ReferenceError: arguments is not defined

an object representing an array that has five elements

Copy the file into a database and perform the operations there

Use readline together with streams to read and transform and write the file contents line by line

Use regular expressions directly on the file

Use Promises and async/await to offload the task to libuv

__pathname

__location

__flder

__filename

exports, require, module, __filename, __dirname

exports, __filename, __dirname

exports, process, require, module, __filename, __dirname

exports, module, __filename, __dirname

functions, objects, arrays, or anything you assign to the module

only variables and arrays

only functions

only objects

10.

node -h

node index.js -x

node index.js -h

node -v

11.

node -p "os.cpus().length"

node -p "process.cpus"

node -p "util.cpus().size"

node -p "process.os.cpus"

12.

Every Node process runs in a single thread, and all the I/O work is run in that same thread

JavaScript execution in Node.js is single-threaded, but I/O operations are executed using multiple threads

The event loop is single-threaded, but a JavaScript VM can use multiple threads

Every Node process gets four threads that it can share between its JavaScript VM and the event loop

13.

assert.isDate(value)

util.types.isDate(value)

util.date(value)

console.isDate(value)

14.

--dev-tools

--debug

--chrome

--inspect

15.

p61

{}

{ name: 'Jane' }

{'Jane'}

Jane

16.

p17

A new VM instance is created and the two VM instances will be shared between the forked process and the parent process.

The forked process will have its own VM instance.

The forked process shares the event loop with the parent process

The forked process shares the same VM thread with the parent process.

17.

a JavaScript file that can have a .node extension as well as the .js extension

a C++ file that can have a .node extension and that Node will be able to execute directly.

a JSON file that can have a .node extension as well as the .json extension

a C++ Addon file that is built with node-gyp

18.

As Node.js is asynchronous, this is handled by a libuv and a threadpool. The performance will not notably degrade.

The current thread will block until the executon is completed and the operating system will spawn new threads to handle incoming requests. This can exhaust the number of allowed threads (255) and degrade performance over time.

As Node.js is asynchronous, this is handled by a threadpool and the performance will not notably degrade.

As the application code runs asynchronously within a single thread, the execution will block, accepting no more requests until the operation is completed.

19.