Writing data with Writable streams in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a writable stream to a file named 'output.txt'.

Node.js

import { createWriteStream } from 'fs';
const writable = createWriteStream([1]);

Drag options to blanks, or click blank then click option'

A'readme.md'

B'input.txt'

C'data.json'

D'output.txt'

Attempts:

3 left

💡 Hint

Common Mistakes

Using a filename meant for reading instead of writing.

Forgetting to put the filename in quotes.

The createWriteStream function needs the filename where data will be written. Here, 'output.txt' is the correct target file.

2fill in blank

medium

Complete the code to write the string 'Hello, world!' to the writable stream.

Node.js

writable.[1]('Hello, world!');

Drag options to blanks, or click blank then click option'

Apipe

Bwrite

Cend

Dread

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'read' which is for readable streams.

Using 'end' which closes the stream immediately.

The write method sends data to the writable stream.

3fill in blank

hard

Fix the error in the code to properly close the writable stream after writing.

Node.js

writable.write('Data');
writable.[1]();

Drag options to blanks, or click blank then click option'

Aend

Bfinish

Cclose

Ddestroy

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'close' which is not a method on writable streams.

Using 'finish' which is an event, not a method.

The end method signals that no more data will be written and closes the stream properly.

4fill in blank

hard

Fill both blanks to create a writable stream and write 'Test' to it.

Node.js

import { [1] } from 'fs';
const stream = [2]('test.txt');
stream.write('Test');

Drag options to blanks, or click blank then click option'

AcreateWriteStream

BcreateReadStream

CwriteFileSync

DreadFileSync

Attempts:

3 left

💡 Hint

Common Mistakes

Using read stream functions instead of write stream.

Using synchronous file write functions which do not create streams.

Both blanks require createWriteStream to import and create the writable stream.

5fill in blank

hard

Fill all three blanks to write 'Hello' to a file and close the stream properly.

Node.js

import { [1] } from 'fs';
const ws = [2]('hello.txt');
ws.[3]('Hello');
ws.end();

Drag options to blanks, or click blank then click option'

AcreateReadStream

BcreateWriteStream

Cwrite

DreadFileSync

Attempts:

3 left

💡 Hint

Common Mistakes

Using read stream functions instead of write stream.

Using 'readFileSync' which is not related to streams.

Using 'createReadStream' instead of 'createWriteStream'.

Use createWriteStream to import and create the stream, and write to send data.