node

Question 1

What is Node.js?

Answer 1

Node.js is a program that allows JavaScript to be run outside of a web browser

Question 2

What can Node.js be used for?

Answer 2

It is commonly used to build back ends for Web applications, command-line programs, or any kind of automation that developers wish to perform./ as a back end api/ to make programs that run on the command line/ or any desktop program/ almost any area of programming

Question 3

What is a REPL?

Answer 3

read–eval–print loop (REPL),
is a simple interactive computer programming environment that takes single user inputs, executes them, and returns the result to the user another existing tool would be an ineractive coding inviroment like the chrome console.

node js can be ran as a REPL in ineractive mode

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,Java,c++

Question 6

What is a computer process?

Answer 6

the instance(copy) of a computer program that is being executed by one or many threads(a program that is bein runned)

Question 7

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

Answer 7

7

Question 8

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

Answer 8

Full stack Web development is based on making multiple processes work together to form one application, This will be extremely important when learning about applications made of multiple components, such as clients, servers, and databases.

Question 9

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

Answer 9

The process object is a global object that provides information about, and control over, the current Node.js process. As a global, it is always available to Node.js applications without using require().

it has many events that can be used to

Question 10

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

Answer 10

it can also be explicitly accessed using require():

and it is always available to Node.js applications without using require(). I

Question 11

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

Answer 11

array with string elements

Question 12

What is a JavaScript module?

Answer 12

1. In JavaScript, a “module” is a single .js file.

2. they each have module scope meaning its data is only available within that module

Question 13

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

Answer 13

exports/required/moduele/___filename/___dirname

Question 14

What is a JavaScript module?

Answer 14

A module in JavaScript is just a file containing related code.

Question 15

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

Answer 15

process/ console/ setTimeout

Question 16

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

Answer 16

The export statement is used when you want to house the things that are ,ade available to other modules like functions objects variables etc.

Question 17

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

Answer 17

that can be with both require for the common js method require  
var exampleBlah = require('./example.js')

and import but thats for module 3, it was not available to node until later on

Question 18

What is the JavaScript Event Loop?

Answer 18

the event loop is the loop that passes whatever is in the event que into the stack once the after the stack is empty

Question 19

What is different between “blocking” and “non-blocking” with respect to how code is executed?

Answer 19

blocking is any code that blocks further execution until that operation is completed, while none blocking does not block other executions

Question 20

What is a directory?

Answer 20

its a folder that houses the list of file names that it contains and it points to those individual files

Question 21

What is a relative file path?

Answer 21

it is a path to a file relative to the current directory/folder that starts with just its name
EXAMPLE: somedirectory/someotherfile.js

Question 22

What is an absolute file path?

Answer 22

the entire URL to a file from the root of the file system it starts with a /
EXAMPLE: /HOME/USERNAME/SOMEDIRECTORY/SOMEFILE.JS

Question 23

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

Answer 23

the ‘fs’ module

Question 24

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

Answer 24

writeFile method

Question 25

Are file operations using the fs module synchronous or asynchronous?

Answer 25

asynchronous