Node.js Technology & Digital Applications 3

Question 1

In Express.js, what is the correct way to define a route parameter named `id`?

Accepted Answer

/users/:id

Answer

Express uses the colon syntax (`:id`) to declare route parameters, accessible via `req.params.id`.

Question 2

What will `typeof null` return in JavaScript/Node.js?

Accepted Answer

"object"

Answer

`typeof null` returns `"object"` — a long-standing JavaScript bug that was kept for backward compatibility.

Question 3

Which npm command shows a tree of all installed packages and their dependencies for the current project?

Accepted Answer

npm list

Answer

`npm list` (or `npm ls`) prints the dependency tree of the current project to the terminal.

Question 4

What is a key advantage of using `worker_threads` over the `child_process` module for CPU-intensive tasks?

Accepted Answer

Worker threads share memory via SharedArrayBuffer, reducing data-copy overhead

Answer

Worker threads run in the same process and can share memory through `SharedArrayBuffer`, making data transfer cheaper than IPC serialization.

Question 5

In Node.js, which event is emitted when all data has been read from a Readable stream?

Accepted Answer

'end'

Answer

The `'end'` event is emitted when there is no more data to be consumed from a Readable stream.

Node.js Practice Test