Node

Question 1

What is Node.js?

Answer 1

-Asynchronous event-driven JavaScript runtime

Question 2

What can Node.js be used for?

Answer 2

-Build scalable network applications

Question 3

What is a REPL?

Answer 3

-Read-eval-print loop

Question 4

When was Node.js created?

Answer 4

-Node.js was initially released on May 27, 2009

Question 5

What back end languages have you heard of?

Answer 5

-C, C++, Java, Ruby, PHP, Python

Question 6

What is a computer process?

Answer 6

-Process is 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

-120

Question 8

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

Answer 8

-Full stack development is based on making multiple processes work together to form one appliation

Question 9

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

Answer 9

-global that provides information about, and control over, the currnet Node.js process

Question 10

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

Answer 10

-process.argv

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

-Each js file is treated as a module

Question 13

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

Answer 13

• __dirname
• __filename
• exports
• module
• require()

Question 14

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

Answer 14

• process

- global

Question 15

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

Answer 15

-Tells Node.js which bits of code to export from a given file so other modules have access to the exported code

Question 16

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

Answer 16

-require()

Question 17

What is the JavaScript Event Loop?

Answer 17

-If the stack is empty, it takes the first item on the queue and pushes to the stack

Question 18

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

Answer 18

-Blocking refers to operations that block further execution until that operation finishes while non-blocking refers to code that doesn’t block execution

Question 19

What is a directory?

Answer 19

-Location for storing files on computers

Question 20

What is a relative file path?

Answer 20

-A relative path needs to be combined with another path in order to access a file

Question 21

What is an absolute file path?

Answer 21

-An absolute path always contains the root element and the complete directory list required to locate the file

Question 22

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

Answer 22

-fs

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

-Both asynchronous and synchronous