node

Question 1

What is Node.js?

Answer 1

its a javaScript runtime

Question 2

What can Node.js be used for?

Answer 2

running JS in the command line

Question 3

What is a REPL?

Answer 3

read eval print loop, playground for code

Question 4

When was Node.js created?

Answer 4

may 27, 2009

Question 5

What back end languages have you heard of?

Answer 5

“scripting languages” (interpreted)
python, javascript, ruby,
php, perl,

“compiled” (machine code translated)
c, c++ golang, haskell, crystal, rust

partially compiled(jvm)
java, scala, closure, kotlin

partially compiled(
 c#, f#

Question 6

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

Answer 6

info about and control over the current node process

Question 7

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

Answer 7

grab out of thin air because it’s global

Question 8

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

Answer 8

array of strings

Question 9

What is a JavaScript module?

Answer 9

a separate .js file used to separate and organize work that can be exported to and called upon by other modules and .js files in the directory

Question 10

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

Question 11

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

Answer 11

process, console

Question 12

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

Answer 12

creating a global data model that’s accessible from other modules in your file library

Question 13

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

Answer 13

assigning a require call with path to the file to a variable

Question 14

What is a directory?

Answer 14

a special file that points to other files

Question 15

What is a relative file path?

Answer 15

a path to a file from where you currently are

Question 16

What is an absolute file path?

Answer 16

takes you from the root of the document to a specific file

Question 17

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

Answer 17

fs module

Question 18

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

Answer 18

writeFile method

Question 19

Are file operations using the fs module synchronous or asynchronous?

Answer 19

yes, you get to choose which version to use

Question 20

What is NPM?

Answer 20

the website, the CLI, the registry

Question 21

What is a package?

Answer 21

a directory with a package.json file and one or more files in it

Question 22

How can you create a package.json with npm?

Answer 22

npm init –yes

Question 23

What is a dependency and how to you add one to a package?

Answer 23

something you’re package will need to run,

npm install filename

Question 24

What happens when you

add a dependency to a package with npm?

Answer 24

it downloads the node modules to your local system

Question 25

How do you add express to your package dependencies?

Answer 25

npm i express

Question 26

What Express application method starts the server and binds it to a network PORT?

Answer 26

.listen() method

Question 27

How do you mount a middleware with an Express application?

Answer 27

app.use method

Question 28

Which objects does an Express application pass to your middleware to manage the request/response lifecycle of the server?

Answer 28

request obj and response obj(req, res)

Question 29

What is the appropriate Content-Type header for HTTP messages that contain JSON in their bodies?

Answer 29

application/json

Question 30

What does the express.json() middleware do and when would you need it?

Answer 30

to parse the incoming JSON requests, you’ll need it when you’re handling incoming JSON request bodies

Question 31

hat is the significance of an HTTP request’s method?

Answer 31

it defines the desired action to be performed at the given resource or path

Question 32

app.use is the catchall middleware

Answer 32

use them for anytime you want an express function to run everytime you run the stack

Question 33

What is Webpack?

Answer 33

a module bundler to package JS and makes it all useable for the web

Question 34

How do you add a devDependency to a package?

Answer 34

npm i –save-dev or npm i -D

Question 35

What is an NPM script?

Answer 35

a property in package.json to store terminal commands

Question 36

How do you execute Webpack with npm run?

Answer 36

npm run build

Question 37

What does express.static() return?

Answer 37

a middleware function

Question 38

What is the local __dirname variable in a Node.js module?

Answer 38

an absolute path to the directory name of the current module

Question 39

What does the join() method of Node’s path module do?

Answer 39

joins path segments together into one useable filepath

Question 40

What does fetch() return?

Answer 40

a promise that resolves the response

Question 41

What is the default request method used by fetch()?

Answer 41

get

Question 42

How do you specify the request method (GET, POST, etc.) when calling fetch?