Node.js

Question 1

What is Node.js?

Answer 1

Node.js is a program that allows JavaScript to be run outside of a web browser. Node.js is a set of libraries for JavaScript which allows it to be used outside of the browser. It is primarily focused on creating simple, easy-to-build network clients and servers.

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.

Question 3

What is a REPL?

Answer 3

REPL stands for Read-eval-print loop and is a simple interactive computer programming environment that takes single user inputs, executes them, and returns the result to the user; a program written in a REPL environment is executed piecewise. Devtools/browser console is REPL

Question 4

When was Node.js created?

Answer 4

2009 by Ryan Dahl

Question 5

What back end languages have you heard of?

Answer 5

JavaScript, Java, Python, PHP, Ruby, C, C++, sql*, go, rust, swift, assembly, C#

Question 6

What is a computer process?

Answer 6

d

Question 7

Roughly how many computer processes are running on your host operating system (Task Manager or Activity Monitor)?

Answer 7

over 300

Question 8

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

Answer 8

Full stack Web development is about

Question 9

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

Answer 9

global variable in node and it gives you information about current Node.js

Question 10

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

Answer 10

use node command for location of node, app name for location of the app or files and then command

Question 11

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

Answer 11

string

Question 12

What is a JavaScript module?

Answer 12

single js file

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

console and process

Question 15

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

Answer 15

module.exports tells Node.js which codes(functions, objects, strings) to export from a given file so other files can also access the exported code

Question 16

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

Answer 16

by calling local require() function to import each of the functions defined

Question 17

What is a directory?

Answer 17

It’s a folder - collection of files

Question 18

What is a relative file path?

Answer 18

location that is relative to a current directory - (.) for current, (..) for parent

Question 19

What is an absolute file path?

Answer 19

contains the root element and the complete directory list required to locate the file (/) for

Question 20

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

Answer 20

fs module

Question 21

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

Answer 21

fs.writeFile

Question 22

Are file operations using the fs module synchronous or asynchronous?

Answer 22

asynchronous and synchronous - they have methods for both - generally asynchronous though