JavaScript Node.js Basics 2

Question 1

Which Node.js global object provides information about the current process, such as its PID and environment variables?

Accepted Answer

process

Answer

The `process` global object exposes process-level data including `process.pid`, `process.env`, `process.argv`, and lifecycle methods like `process.exit()`.

Question 2

What does the `fs.readFileSync()` method do differently from `fs.readFile()`?

Accepted Answer

It blocks the event loop until the file is fully read

Answer

`fs.readFileSync()` is synchronous and blocks the event loop until the operation completes, whereas `fs.readFile()` is asynchronous and uses a callback.

Question 3

In Node.js, what is the purpose of the `__dirname` variable?

Accepted Answer

It returns the absolute path of the directory containing the current module file

Answer

`__dirname` is a module-scoped variable that holds the absolute path of the directory where the current module file resides.

Question 4

Which method is used to make a directory recursively in Node.js's `fs` module?

Accepted Answer

fs.mkdir(path, { recursive: true })

Answer

`fs.mkdir(path, { recursive: true })` creates the target directory and any necessary parent directories without throwing if they already exist.

Question 5

What does `process.argv[2]` typically contain when you run `node app.js hello`?

Accepted Answer

'hello'

Answer

`process.argv[0]` is the path to node, `[1]` is the script path, and `[2]` onwards are the user-supplied command-line arguments.

JavaScript Practice Test

JavaScript Practice Test

JavaScript Node.js Basics 2