Node JS

Question 1

What is Node.js?

Answer 1

It is a JavaScript environment that allows you to run JavaScript outside of a browser

Question 2

What can Node.js be used for?

Answer 2

It can be used to run server applications, run command lines, program robots, etc.

Question 3

What is a REPL?

Answer 3

Stands for Read-Eval-Print-Loop, and refers to a computer programming environment where user inputs are taken one line at a time, executed, and returned; a language shell

Question 4

When was Node.js created?

Answer 4

2009

Question 5

What is a computer process?

Answer 5

An instance of a computer program that is being executed; a “task” in the task manager

Question 6

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

Answer 6

We will be working with computer processes that appear in our “stack”

Question 7

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

Answer 7

An object representing the current Node.js process that is being run

Question 8

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

Answer 8

Using the variable process

Question 9

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

Answer 9

array

Question 10

What is a JavaScript module?

Answer 10

An individual .js file

Question 11

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

Answer 11

exports, require, module, __filename, __dirname

Question 12

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

Answer 12

process, global

Question 13

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

Answer 13

It allows other files to import objects from the module

Question 14

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

Answer 14

Using the require function require(‘relativeUrl.js’)

Question 15

What is a directory?

Answer 15

A location that stores files and other directories

Question 16

What is an absolute file path?

Answer 16

A file path starting with the root directory; starts with /

Question 17

What is a relative file path?

Answer 17

A file path that does not start with /, referring to a file based on it’s location relative to the current working directory

Question 18

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

Answer 18

fs

Question 19

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

Answer 19

.writeFile(file, data, callback)

Question 20

Are file operations using the fs module synchronous or asynchronous?

Answer 20

asynchronous