The Event Loop, Node fs readFile and writeFile

Question 1

What is the JavaScript Event Loop?

Answer 1

The Event Loop is a queue of callback functions. Takes the first thing on the callback queue and puts it back on the stack if the stack is empty

Question 2

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

Answer 2

Blockingis when the execution of additional JavaScript in the Node.js process must wait until a non-JavaScript operation completes.
Non-blockingmethods executeasynchronously.

Question 3

What is a directory?

Answer 3

Also called folders

Question 4

What is a relative file path?

Answer 4

Relative file path to current directory (doesn’t start with a slash)

Question 5

What is an absolute file path?

Answer 5

Absolute path contains the root of element and the complete directory list required to location file. Starts with a slash

Question 6

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

Answer 6

The fs (file system) module

Question 7

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

Answer 7

writeFile( ) method

Question 8

Are file operations using the fs module synchronous or asynchronous?

Answer 8

Both. The ones that are synchronous will have ‘sync’ in the name.