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. Making web servers

Question 3

What is a REPL?

Answer 3

A read–eval–print loop (REPL), also termed an interactive toplevel or language shell, is a simple interactive computer programming environment that takes single user inputs, 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

Python, JavaScript, C++, Ruby, PhP

Question 6

What is a computer process?

Answer 6

Any running program on computer

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

135

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

Question 9

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

Answer 9

The process object is a global 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()

Question 10

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

Answer 10

console.log(process)

In terminal, use node nameOfFile

Question 11

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

Answer 11

Array

Question 12

What is a JavaScript module?

Answer 12

A javascript file containing code

Question 13

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

Answer 13

exports, require, module, __filename, __dirname

Question 14

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

Answer 14

Process, console, setInterval, setTimeout

Question 15

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

Answer 15

To be able to separate functions into their own file and make it easier to use in other files.

Question 16

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

Answer 16

require() function to import each of the functions defined

Question 17

What is the JavaScript Event Loop?

Answer 17

concurrency model based on an event loop, which is responsible for executing the code, collecting and processing events, and executing queued sub-tasks.

Runs everything in stack, checks queue, pushes everything from stack, keep looping

Question 18

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

Answer 18

Code that is blocked/slow will prevent other code from being executed.

Non Blocked code/asynchronous code will run multiple code at the same time

Question 19

What is a directory?

Answer 19

A folder

Question 20

What is a relative file path?

Answer 20

Relative path is a path relative to the current page’s path location

Question 21

What is an absolute file path?

Answer 21

a path that starts from the root of the Drive to the destination

Question 22

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

Answer 22

File system module

Question 23

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

Answer 23

fs.writeFile()

Question 24

Are file operations using the fs module synchronous or asynchronous?

Answer 24

Asynchronous (does multiple codes at once)

Question 25

What is NPM?

Answer 25

Node Package Manager. npm is the world’s largest software registry. use npm to share and borrow packages

Question 26

What is a package?

Answer 26

A directory with one or more files within. Reusable code compiled within a directory

Question 27

How can you create a package.json with npm?

Answer 27

npm init –yes or npm init -y

Question 28

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

Answer 28

A dependency is another package that your package needs in order to work.

Include the dependency after npm install

Question 29

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

Answer 29

Downloads file and

Question 30

How do you add express to your package dependencies?

Answer 30

Npm install express

Question 31

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

Answer 31

Listen method