node

Question 1

What are the 3 components of a full stack Web architecture?

Answer 1

presentation, logic, and data

Question 2

What is Node.js?

Answer 2

an asynchronous event-driven JavaScript runtime for the back end

Question 3

What can Node.js be used for?

Answer 3

to build scalable network applications

Question 4

What is a REPL?

Answer 4

read-eval-print loop

Question 5

When was Node.js created?

Answer 5

2009

Question 6

What backend languages have you heard of?

Answer 6

python, php, ruby, C sharp, Java, C++

Question 7

What is a computer process?

Question 8

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

Question 9

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

Question 10

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

Answer 10

process is a global object so to access it just

Question 11

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

Answer 11

always strings

Question 12

How do you access the command line arguments in a Node.js program?

Answer 12

process.argv[2] or const [ , , …message ] = process.argv;
console.log(message.join(‘ ‘));

Question 13

What is a JavaScript module?

Answer 13

a file that has JavaScript code in it.

Question 14

What are the advantages of modular programming?

Answer 14

keeps the code small, succinct and easy to understand

Question 15

In JavaScript, how do you make a function in a module available to other modules?

Answer 15

you export it using the keyword export

Question 16

In JavaScript, how do you use a function from another module?

Answer 16

you import it using the keyword import

Question 17

What is the JavaScript Event Loop?

Question 18

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

Answer 18

“blocking” code is executed synchronously, while “non-blocking” code is executed asynchronously

Question 19

What is a directory?

Answer 19

a folder

Question 20

What is a relative file path?

Answer 20

a file in the same directory

Question 21

What is an absolute file path?

Answer 21

always starts with a “/”

Question 22

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

Question 23

What method is available in the node:fs module for reading data from a file?

Question 24

What method is available in the node:fs module for writing data to a file?

Answer 24

writeFile() method

Question 25

Are file operations using the fs module synchronous or asynchronous?

Answer 25

asynchronous because file operations are slow to avoid blocking the process.