Day 2 - Memory doesn't grow on Christmas trees 🎄

“Alright, Bernard,” Santa said, locking eyes with the elf. “I thought you were one of the good ones. I even considered giving you a share in the sleigh’s IPO. But THIS?!” He waved the paper like it was a subpoena. "The function you defined yesterday takes ownership of the message, now the reindeer and the other elves are cloning like it's a Black Friday sale! Memory doesn’t grow on Christmas trees, Bernard!”

"This API is TRASH!" Santa bellowed!

fn main(){
    let message = String::from("Ho ho ho! Merry Christmas!");
    attach_message_to_present(message.clone());
    println!("{}", message);
}

Prancer trotted by with a scowl. "We shouldn't have used Rust in the first place. This is what we get for trying to be fancy,"

Your Task

Santa’s right (as always, he’s Santa). The function takes ownership of the String, you should update the function signature to accept a reference instead of owning the value. This way we don't need to clone the message and can just borrow it.

Hints

Here is a hint to help you solve the challenge

Click here to see the hint

To use a reference, you can either use &String or &str as the function parameter type.

pub fn attach_message_to_present(message: &String) {
    println!("The present now has this message: {}", message);
}

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Solutions

Esteban Pérez

lep511

an hour ago

393.61ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &str) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

kustrun

6 hours ago

411.65ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Andrew Nicholls

Booleans

15 hours ago

414.25ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Ziyad Alkhonein

ZeadAlkhonein

2 days ago

372.48ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Harrison Knight

hijknight

3 days ago

437.39ms

88.70kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Lucas Deprit

lucasdeprit

4 days ago

389.52ms

88.70kb

// TODO: Update the function argument type
pub fn print_message(message: &str) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

SilentCanon

silentcanon

6 days ago

418.94ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Oleksii Khodakovskyi

Rezistencee

6 days ago

382.53ms

88.70kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Gaga889

7 days ago

344.08ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Gaga889

7 days ago

369.17ms

88.70kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

James Parkington

james-parky

7 days ago

422.42ms

88.71kb

// TODO: Update the function argument type
pub fn print_message(message: &str) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

fivaya

7 days ago

356.72ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Kishan Patel

KishanPatel4273

8 days ago

381.40ms

88.71kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Benjamin Chedotel

bchedotel

8 days ago

464.59ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

shangchiyu

9 days ago

383.51ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    let b = &gift_message;
    print_message(b);
    println!("{}", gift_message);
}

Hofer Leo

HofLe

9 days ago

351.28ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

raj-klaviyo

10 days ago

399.81ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Christopher Nielson

c-nielson

10 days ago

368.34ms

88.71kb

pub fn print_message(message: &str) {
    println!("Message: {}", message);
}

Yi Hao

leongyihao

10 days ago

367.31ms

88.71kb

// TODO: Update the function argument type
pub fn print_message(message: &str) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Kurisu-Null

10 days ago

363.23ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &str) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Mahammed Numeez Baloch

Numeez

10 days ago

378.47ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Muhammad Najib Bala

NAJIB-B

10 days ago

374.54ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &str) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Jurkiseczek

11 days ago

414.46ms

88.71kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

rponcepore

11 days ago

387.37ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &str) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Kyle Stiers

KyleStiers

12 days ago

402.00ms

88.70kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Louis

tototomate123

12 days ago

576.13ms

88.71kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Jason Cheng

JasonCheng1

13 days ago

382.61ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

anjanimaurya

13 days ago

447.81ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &str) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

avilikof

14 days ago

382.00ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &str) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

16danjj

15 days ago

352.02ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &str) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Vibration824

15 days ago

364.22ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

norabbito

16 days ago

352.32ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

zuernerd

16 days ago

362.63ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

GDU

gdu-dt

16 days ago

359.66ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Manu

wirew0lf

19 days ago

361.22ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

KalaayPT

19 days ago

362.06ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Ayush Srivastava

Sriyush

19 days ago

449.56ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Ifediora Emmanuel

Manuelshub

19 days ago

413.70ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Finlay Robb

finlaysr

19 days ago

351.92ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Maciej Bartczak

maciekbartczak

20 days ago

366.76ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Donald Huber-Youmans

dHuberYoumans

22 days ago

435.31ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message.to_string());
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Swarnim Chandve

Swarnim-Chandve

22 days ago

437.86ms

88.71kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

TaiPoole

23 days ago

389.48ms

88.71kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

sakulstar

23 days ago

356.54ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

peterblomhansen

23 days ago

373.11ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

tnsborum

23 days ago

368.81ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

prey169

24 days ago

337.98ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

christianbaumberger

24 days ago

402.12ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Sthitaprajna Sahu

sthitasahu

24 days ago

473.41ms

88.71kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Finbar O'Mahony

finbaromahony

25 days ago

383.82ms

88.74kb

// TODO: Update the function argument type
pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
// Example Usage
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}