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Node.js

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.

.save

.break

.editor

.history

2.

p32

ReferenceError: arguments is not defined

an object representing an array that has five elements

undefined

an empty string

3.

node -p "process.os.cpus"

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

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

node -p "process.cpus"

4.

util.date(value)

console.isDate(value)

assert.isDate(value)

util.types.isDate(value)

5.

__flder

__filename

__pathname

__location

6.

p17

The forked process shares the event loop with the parent process

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 will have its own VM instance.

7.

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

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.

8.

Use regular expressions directly on the file

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

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

Copy the file into a database and perform the operations there

9.

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

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

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

10.

p61

{'Jane'}

{}

{ name: 'Jane' }

Jane

11.

lookup

resolve

reverse

resolve4

12.

p62

{}

John

Undefined

{'John'}

13.

p24

server running at http://127.0.0.1:3000/

server running at port 3000

server running at http://localhost:4000/

server running at http://localhost:3000/

14.

exports, module, __filename, __dirname

exports, process, require, module, __filename, __dirname

exports, require, module, __filename, __dirname

exports, __filename, __dirname

15.

--debug

--dev-tools

--chrome

--inspect

16.

p27

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

17.

exec("ps -ef")

spawn("ps -ef")

exec("ps", "-ef")

fork("ps -ef")

18.

node index.js -h

node index.js -x

node -v

node -h

19.

only variables and arrays

only functions

only objects

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

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