Node

Question 1

What is a CLI?

Answer 1

CLI (command line interface) is a way for a user to see commands in a form of lines of text

Question 2

What is GUI?

Answer 2

GUI (graphical user interface) is a way for a user to see commands in a form of graphical icons

Question 2

What is GUI?

Answer 2

GUI (graphical user interface) is a way for a user to see commands in a form of graphical icons

Question 3

Give at least one use case for each of the commands listed in this exercise.
- man
- cat
- ls
- pwd
- echo
- touch
- mkdir
- mv
- rm
- cp

Answer 3

man man (displays man manual)

cat (concatenate files and print on the standard output)

ls (to list out the contents of the directory currently being worked on)

pwd (to make sure you’re working on the correct directory)

echo (display a line of text)

touch (to create new files)

mkdir (to make a new directory)

mv (to rename a file)

rm (to delete a file)

cp (to make copies)

Question 4

What are the three virtues of a great programmer?

Answer 4

Laziness, Impatience, and Hubris.

Question 5

What are 3 components of a fullstack Web architecture?

Answer 5

Presentation
Logic
Data

Question 6

What is Node.js?

Answer 6

A javascript runtime to build scalable network applications

Question 7

What can Node.js be used for?

Answer 7

Usually to run the backend side of applications as well as servers

Question 8

What is REPL?

Answer 8

Reads input
Executes input
Prints input
Loops input

Question 9

When was Node.js created ?

Answer 9

2009

Question 10

What backend languages have you heard of?

Answer 10

Python, PHP. C#, Ruby, C++ and Java

Question 11

What is a computer process?

Answer 11

The instance of a computer program that is being executed by one or more threads

Question 12

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

Answer 12

A lot

Question 13

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

Answer 13

To be aware of what you’re executing

Question 14

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

Answer 14

A global that provides information about, and control over, the current Node.js process.

Question 15

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

Answer 15

With the variable process

Question 16

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

Answer 16

An array of strings

Question 17

How do you access the command line arguments in a Node.js program?

Answer 17

Within splice(2)

Question 18

What is process.argv?

Answer 18

The process.argv property returns an array containing the command line arguments passed when the Node.js process was launched

Question 19

What is a JavaScript module?

Answer 19

A file with code

Question 20

What are the advantages of modular programming?

Answer 20

Makes it a bit easier and organized on breaking down larger problems

Question 21

In JavaScript, how do you make a function in a module available to other modules?

Answer 21

Using the Export keyword

Question 22

In JavaScript, how do you use a function from another module?

Answer 22

Using the Import keyword with curly braces if no default was exported

Question 23

What is the JavaScript Event Loop?

Answer 23

A mechanism through which the ‘calls waiting for execution’ in the callback queue/job queue can be put on the call stack

Question 24

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

Answer 24

Blocking executes synchronously
Non-Blocking executes asynchronously

Question 25

What is a directory?

Answer 25

A container that holds file (a.k.a foler)

Question 26

What is a relative file path?

Answer 26

The location of a file relative to the current (working) directory*

Question 27

What is an absolute file path?

Answer 27

A file that always starts at the root (always starts with a slash)

Question 28

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

Answer 28

fs file system

Question 29

What method is available in the node:fs module for reading data from a file?

Answer 29

readFile

Question 30

what is ./

Answer 30

The current directory / folder

Question 31

async arrow function

Answer 31

const name = async ( ) => { };

Question 32

What method is available in the node:fs module for writing data to a file?

Answer 32

writeFile()

Question 33

Are file operations using the fs module synchronous or asynchronous?

Answer 33

Asynchronous because file operations are slow