Node.js

Question 1

What is Node.js?

Answer 1

Javascript engine that allows you to run Javascript outside of the browser

Question 2

What can Node.js be used for?

Answer 2

Used to build network applications (like a server) but also any applications (NASA rover programmed with Node)

Question 3

What is a REPL?

Answer 3

Read-eval-print loop
A simple interactive programming environment that takes single user inputs, executes them, and returns the result to the user. Basically a little playground environment to learn and test things

Question 4

When was Node.js created?

Answer 4

2009

Question 5

What back end languages have you heard of?

Answer 5

PHP, Python, C++, GoLang

Question 6

What is a computer process?

Answer 6

The instance of a computer program that is being executed by one of many threads. A process contains the program code and its activity.

Question 7

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

Answer 7

Our websites, apps, and/or servers will have more than one process occurring so we should know enough about processes to make our projects work correctly.

Question 8

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

Answer 8

Gives information on whatever the current process running in Node.js is

Question 9

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

Answer 9

Using process

Question 10

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

Answer 10

Array

Question 11

What is a JavaScript module?

Answer 11

A single .js file

Question 12

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

Answer 12

Require, exports, module, _dirname, and _filename

Question 13

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

Answer 13

Process and console

Question 14

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

Answer 14

To be able to use methods/variables in other JS files

Question 15

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

Answer 15

When you write the export on the first file you make a variable on the second file that calls the file path with require.

Question 16

What is the JavaScript Event Loop?

Answer 16

The stack of events, procedures that Java has to run

Question 17

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

Answer 17

Blocking executes synchronously. The execution of additional Javascript in the Node.js process must wait until a non-Javascript operation completes.
Non blocking is asynchronous.

Question 18

What is a directory?

Answer 18

A folder that holds files and folders

Question 19

What is a relative file path?

Answer 19

The path from the current file to the destination file

Question 20

What is an absolute file path?

Answer 20

The path from the beginning of the hard drive to whatever the destination file is

Question 21

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

Answer 21

Fs (file system module)

Question 22

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

Answer 22

Writefile

Question 23

Are file operations using the fs module synchronous or asynchronous?

Answer 23

Asynchronous