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);
}

Editor not available on Mobile!

In order to solve the challenge, please visit this page on a desktop computer.

Solutions

PierreBhs

2 days ago

358.09ms

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);
}

sam

nextbysam

3 days ago

358.23ms

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 alt_message = &gift_message;
    print_message(alt_message);
    println!("{}", gift_message);
}

Dave Weston

dtweston

4 days ago

384.78ms

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);
}

Khanh Tang

smokeInCloud060201

4 days ago

357.69ms

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);
}

Daniel Laden

Dan-Laden

5 days ago

353.88ms

88.74kb

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

hbarkh

5 days ago

463.65ms

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);
}

Ross

xenon87

5 days ago

357.18ms

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);
}

Asrul Firdaus

AsrulF

6 days ago

409.76ms

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);
}

Tadas Šimkus

TSimkus

6 days ago

374.00ms

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 = "Merry Christmas! Enjoy your gift!";
    print_message(&gift_message);
    println!("{}", gift_message);
}

Ivan Bykov

renbrek

6 days ago

381.85ms

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);
}

PlayMBAACC

7 days ago

411.08ms

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);
}

Ramon Silva

rsilva1

8 days ago

354.58ms

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);
}

Dani Gámez Franco

Danziger

8 days ago

379.19ms

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);
}

Bob Walker

hp4k1h5

10 days ago

357.68ms

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);
}

Sergi Férriz

mumpo

10 days ago

340.73ms

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);
}

Se7enseads

10 days ago

368.74ms

88.74kb

pub fn print_message(message: &String) {
    println!("Message: {}", message);
}
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

Anthony Young

A-Young-Git

11 days ago

376.08ms

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);
}

Amit Patel

amitpatel-wstf

12 days ago

348.34ms

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);
}

qsbp4EX06sgX9I40TIx8fvnEM20

12 days ago

394.15ms

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);
}

Felix Paetow

hoall

12 days ago

364.92ms

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);
}

nx0ly

13 days ago

364.07ms

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 = "Merry Christmas! Enjoy your gift!";
    print_message(&gift_message);
    println!("{}", gift_message);
}

Alex Hagen

astronomeralex

15 days ago

371.26ms

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);
}

Retroz

Fungichi

16 days ago

361.80ms

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);
}

LaughingCoffinLawl

16 days ago

377.30ms

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);
}

perl

16 days ago

354.51ms

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!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

tunckiral

swoopertr

16 days ago

359.73ms

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);
}

Jean-Sébastien Bour

Sufflope

17 days ago

379.14ms

88.70kb

pub fn print_message(message: &str) {
    println!("Message: {}", message);
}
pub fn main() {
    let gift_message = String::from("Merry Christmas! Enjoy your gift!");
    print_message(&gift_message);
    println!("{}", gift_message);
}

linter_soldier

randre03

17 days ago

393.19ms

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);
}

Pieter-Jan van Dam

pjvandam

17 days ago

359.15ms

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);
}

Inferno_geek

Infernogeek1

18 days ago

389.11ms

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);
}

Nikolai Neff-Sarnow

nineff

18 days ago

353.61ms

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);
}

Chawin Chaisongkram

chawinkn

19 days ago

411.75ms

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);
}

Benjamin Stürmer

thebino

19 days ago

361.61ms

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);
}

Octave

BadyJoke

19 days ago

381.68ms

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);
}

nurs

19 days ago

387.77ms

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);
}

ExplosiveBike

asaremugezi-source

20 days ago

423.49ms

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);
}

Ho Chun Lau

kylelau519

21 days ago

372.71ms

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);
}

Nguyen Ky Tri

tringuyenarup

21 days ago

474.35ms

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);
}

luke-nigro

21 days ago

357.98ms

88.74kb

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

yuvicc

21 days ago

360.46ms

88.74kb

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);
}

yuvicc

21 days ago

456.10ms

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);
}

Karshik Madavi

c0d3c

21 days ago

465.93ms

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);
}

Tristan1435

22 days ago

371.68ms

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);
}

Shil Sinha

shils

22 days ago

451.04ms

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);
}

kchurikov

22 days ago

381.69ms

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);
}

Zakaria HABRI

zakissimo

23 days ago

472.64ms

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);
}

Ireozar

23 days ago

459.57ms

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);
}

Akshay

ajagekarakshay

23 days ago

378.77ms

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);
}

mousebites

23 days ago

522.35ms

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);
}

Daffa Karyudi

KeyCode17

23 days ago

373.60ms

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);
}