Why buffers are needed in Node.js - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a buffer of size 10 bytes.

Node.js

const buf = Buffer.[1](10);

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

Aalloc

Bfrom

Cnew

Dcreate

Attempts:

3 left

💡 Hint

Common Mistakes

Using Buffer.from instead of Buffer.alloc

Trying to use 'new Buffer' which is deprecated

The Buffer.alloc(size) method creates a buffer of the specified size filled with zeros.

2fill in blank

medium

Complete the code to convert a string to a buffer.

Node.js

const buf = Buffer.[1]('hello');

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Afrom

Balloc

Cnew

Dcreate

Attempts:

3 left

💡 Hint

Common Mistakes

Using Buffer.alloc instead of Buffer.from

Trying to use 'new Buffer' which is deprecated

The Buffer.from(string) method creates a buffer containing the bytes of the given string.

3fill in blank

hard

Fix the error in the code to correctly create a buffer from an array.

Node.js

const buf = Buffer.[1]([1, 2, 3]);

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Aalloc

Bcreate

Cfrom

Dnew

Attempts:

3 left

💡 Hint

Common Mistakes

Using Buffer.alloc which creates empty buffer

Using 'new Buffer' which is deprecated

To create a buffer from an array of bytes, use Buffer.from(array).

4fill in blank

hard

Fill both blanks to create a buffer from a string and specify UTF-8 encoding.

Node.js

const buf = Buffer.[1]('hello', [2]);

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

Afrom

B'utf8'

C'ascii'

Dalloc

Attempts:

3 left

💡 Hint

Common Mistakes

Using Buffer.alloc instead of Buffer.from

Using wrong encoding like 'ascii' when UTF-8 is intended

Buffer.from(string, encoding) creates a buffer from a string with the specified encoding, UTF-8 is default and common.

5fill in blank

hard

Fill all three blanks to create a buffer from a string, specify encoding, and convert it back to string.

Node.js

const buf = Buffer.[1]('hello', [2]);
const str = buf.toString([3]);

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

Afrom

B'utf8'

Dalloc

Attempts:

3 left

💡 Hint

Common Mistakes

Using Buffer.alloc instead of Buffer.from

Using different encodings for creation and conversion

This code creates a buffer from a string using UTF-8 encoding and then converts the buffer back to a string using the same encoding.