Node.js

Question 1

What is a CLI?

Answer 1

command line interface

Question 2

What is a GUI?

Answer 2

graphical user interface

Question 3

Give at least one use case for each of the commands listed in this exercise.
man

Answer 3

manual -> look up manual for specific commands

Question 4

Give at least one use case for each of the commands listed in this exercise.
cat

Answer 4

Print standard output of a file or concatenate content of files and print out

Question 5

Give at least one use case for each of the commands listed in this exercise.
ls

Answer 5

List out current files and directory within the current directory

Question 6

Give at least one use case for each of the commands listed in this exercise.
pwd

Answer 6

Print working directory

Question 7

Give at least one use case for each of the commands listed in this exercise.
echo

Answer 7

display line of text

Question 8

Give at least one use case for each of the commands listed in this exercise.
touch

Answer 8

make file timestamp

Question 9

Give at least one use case for each of the commands listed in this exercise.
mkdir

Answer 9

Create new directory

Question 10

Give at least one use case for each of the commands listed in this exercise.
mv

Answer 10

Move or rename a file or directory
mv old_name new_name

Question 11

Give at least one use case for each of the commands listed in this exercise.
rm

Answer 11

Remove (delete) a file or directory (-r)

Question 12

Give at least one use case for each of the commands listed in this exercise.
cp

Answer 12

Make copy of file or directory (-r)

Question 13

What is Node.js?

Answer 13

JavaScript runtime environment

Question 14

What can Node.js be used for?

Answer 14

to built back end
automated scripts
command line programs

Question 15

What is a REPL?

Answer 15

read-eval-print loop

Question 16

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

Answer 16

an object that provides information about, and control over, the current Node.js process.

Question 17

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

Answer 17

const variableName = require(“node:process”);

Question 18

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

Answer 18

Array of string

Question 19

What is a JavaScript module?

Answer 19

file that contain related codes

Question 20

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

Answer 20

exports, require, module, __filename, __dirname

Question 21

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

Answer 21

process, console

Question 22

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

Answer 22

to give access to the variable to be used on another file/module

Question 23

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

Answer 23

const variableName = require(‘pathOfFileToImport’);

Question 24

What is the JavaScript Event Loop?

Answer 24

part of a runtime environment => Look at the call stack, if stack is empty, push (asynchronous callback) task from task queue onto call stack operation

Question 25

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

Answer 25

blocking - slow down the call stack
non-blocking - does not slow down the call stack

Question 26

What is a directory?

Answer 26

folder, the special file that list other files in directory

Question 27

What is a relative file path?

Answer 27

how to get to somewhere relative to where you are currently

Question 28

What is an absolute file path?

Answer 28

file location relative to the root directory

Question 29

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

Answer 29

fs module

Question 29

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

Answer 29

writefile()

Question 30

Are file operations using the fs module synchronous or asynchronous?

Answer 30

both depend on the method used (sync or async methods)