Node

Question 1

What is Node.js?

Answer 1

A program that allows Js to be run outside of a browser.

Question 2

What can Node.js be used for?

Answer 2

Build backend

Question 3

What is a REPL?

Answer 3

read-eval-print loop. Programming environment.

Question 4

When was Node.js created?

Answer 4

May 27, 2009

Question 5

What back end languages have you heard of?

Answer 5

Python, Ruby, PHP

Question 6

What is a computer process?

Answer 6

A computer program being executed by one or many threads.

Question 7

Roughly how many computer processes are running on your host operating system (Task Manager or Activity Monitor)?

Answer 7

500

Question 8

Why should a full stack Web developer know that computer processes exist?

Answer 8

To know if their programs instructions can be executed.

Question 9

What is the process object in a Node.js program?

Answer 9

A global object that provides info and control over the current Node.js process.

Question 10

How do you access the process object in a Node.js program?

Answer 10

process

Question 11

What is the data type of process.argv in Node.js?

Answer 11

array of strings.

Question 12

What is a JavaScript module?

Answer 12

A single Js file

Question 13

What values are passed into a Node.js module’s local scope?

Answer 13

exports, require, module, __filename, and __dirname.

Question 14

Give two examples of truly global variables in a Node.js program.

Answer 14

Process, console

Question 15

What is the purpose of module.exports in a Node.js module?

Answer 15

adds it to the root of the module to be used in other module.

Question 16

How do you import functionality into a Node.js module from another Node.js module?

Answer 16

require(‘filepath’)

Question 17

What is a directory?

Answer 17

Group of files

Question 18

What is a relative file path?

Answer 18

A specific location in a file system relative to the directory you are working in .

Question 19

What is an absolute file path?

Answer 19

The same location in a file system relative to the root directory.

Question 20

What module does Node.js include for manipulating the file system?

Answer 20

File system module.

Question 21

What method is available in the Node.js fs module for writing data to a file?

Answer 21

writeFile method

Question 22

Are file operations using the fs module synchronous or asynchronous?

Answer 22

asynchronous and synchronous

Question 23

What is the JavaScript Event Loop?

Answer 23

Code that sits in a call stack until its time to be queued, then executed once the stack is cleared.