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Node.js

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Bienvenido al test sobre Node.js. Las instrucciones son sencillas.

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.
Cuando hayas terminado el test o el tiempo establecido, pulsa el botón Finalizar.

1

node -p "process.cpus"

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

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

node -p "process.os.cpus"

2

John

Undefined

{}

{'John'}

3

__location

__pathname

__flder

__filename

4

exports, module, __filename, __dirname

exports, process, require, module, __filename, __dirname

exports, __filename, __dirname

exports, require, module, __filename, __dirname

5

The forked process will have its own VM instance.

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 shares the same VM thread with the parent process.

The forked process shares the event loop with the parent process

6

console logs system information

creates a file named data and append numbers

creates a text file hello.txt and appends customized text

creates an image file

7

{ name: 'Jane' }

{}

Jane

{'Jane'}

8

spawn("ps -ef")

exec("ps", "-ef")

exec("ps -ef")

fork("ps -ef")

9

.editor

.save

.break

.history

10

--dev-tools

--inspect

--chrome

--debug

11

resolve4

lookup

resolve

reverse

12

Use regular expressions directly on the file

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

Copy the file into a database and perform the operations there

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

13

only objects

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

only variables and arrays

only functions

14

ReferenceError: arguments is not defined

an object representing an array that has five elements

an empty string

undefined

15

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

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

16

node index.js -x

node index.js -h

node -h

node -v

17

assert.isDate(value)

console.isDate(value)

util.date(value)

util.types.isDate(value)

18

server running at http://localhost:3000/

server running at port 3000

server running at http://127.0.0.1:3000/

server running at http://localhost:4000/

19

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

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

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

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