Rc pointer in Rust - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new Rc pointer.

Rust

let value = Rc::[1](5);

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

Anew

Bclone

Cstrong_count

Ddowngrade

Attempts:

3 left

💡 Hint

Common Mistakes

Using clone instead of new to create the Rc.

Using downgrade which is for Weak pointers.

Use Rc::new to create a new reference-counted pointer.

2fill in blank

medium

Complete the code to clone an existing Rc pointer.

Rust

let rc2 = [1](&rc1);

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

ARc::clone

BRc::new

CRc::downgrade

DRc::strong_count

Attempts:

3 left

💡 Hint

Common Mistakes

Using Rc::new which creates a new pointer with new data.

Using Rc::downgrade which creates a Weak pointer.

Use Rc::clone to create a new pointer to the same data, increasing the reference count.

3fill in blank

hard

Fix the error in the code to get the strong count of an Rc pointer.

Rust

let count = Rc::[1](&rc1);

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

Aclone

Bdowngrade

Cstrong_count

Dnew

Attempts:

3 left

💡 Hint

Common Mistakes

Using clone which copies the pointer.

Using downgrade which creates a Weak pointer.

The method strong_count returns how many Rc pointers share ownership.

4fill in blank

hard

Fill both blanks to create an Rc pointer and clone it.

Rust

let rc1 = Rc::[1](10);
let rc2 = Rc::[2](&rc1);

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

Anew

Bclone

Cdowngrade

Dstrong_count

Attempts:

3 left

💡 Hint

Common Mistakes

Using downgrade instead of clone.

Using strong_count instead of clone.

First create a new Rc pointer with new, then clone it with clone.

5fill in blank

hard

Fill all three blanks to create an Rc pointer, clone it, and get the strong count.

Rust

let rc1 = Rc::[1](20);
let rc2 = Rc::[2](&rc1);
let count = Rc::[3](&rc1);

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

Anew

Bclone

Cstrong_count

Ddowngrade

Attempts:

3 left

💡 Hint

Common Mistakes

Using downgrade instead of clone or strong_count.

Mixing up the order of methods.

Create a new Rc pointer with new, clone it with clone, and get the count with strong_count.