Node.js

Question 1

What is Node.js?

Answer 1

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

Question 2

What can Node.js be used for?

Answer 2

used for traditional web sites and back-end API services, but was designed with real-time, push-based architectures in mind

Question 3

What is a REPL?

Answer 3

Read-eval-print loop
Interactive computer programming environment that takes a single user input, executes them, and returns the result to the user

Question 4

When was Node.js created?

Answer 4

May 27, 2009

Question 5

What back end languages have you heard of?

Answer 5

Ruby
Python
PHP

Question 6

What is a computer process?

Answer 6

The instance of a computer program that is 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

50+

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, so having at least an awareness of computer processes is necessary

Question 9

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

Answer 9

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

Question 10

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

Answer 10

just use the process variable (it’s global)

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 javascript file

Question 13

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

Answer 13

exports, require()

Question 14

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

Answer 14

process, global

Question 15

What is a directory?

Answer 15

is a special type of file that holds information about more directories and files

Question 16

What is a relative file path?

Answer 16

a file relative to the current page

Question 17

What is an absolute file path?

Answer 17

Any path that starts with a slash

Question 18

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

Answer 18

We include the fs module

Question 19

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

Answer 19

Node fs.writeFile

Question 20

Are file operations using the fs module synchronous or asynchronous?

Answer 20

All the operations can be performed in a synchronous as well as in an asynchronous approach depending on the user requirements.

Question 21

What is NPM?

Answer 21

a package manager for JavaScript: website, command line interface, and registry: shared data and packages, etc.
Node Package Manager

Question 22

What is a package?

Answer 22

a folder containing a package.json program that lists the your projects dependencies
specifies versions of packages
makes your build reproducible, to share with other devs (directory with one or more files, and a package.json file)

Question 23

How can you create a package.json with npm?

Answer 23

use the npm init command in the root directory of package

Question 24

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

Answer 24

packages that your project depends on,

you can list them as “dependencies” in package.json

Question 25

What happens when you add a dependency to a package with npm?

Answer 25

the project will install all listed dependencies with the install command

Question 26

How do you add express to your package dependencies?

Answer 26

npm install express automatically updates list of dependencies

Question 27

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

Answer 27

.listen()