Mutable Variables

Declaring and manipulating variables in programming is a fundamental concept that allows you to store and modify data. Variables in Rust are immutable by default, but you can make them mutable using the mut keyword.

In this challenge, you will declare and use mutable variables in Rust. You will be given a function where you need to declare variables, modify their values, and perform specific operations.

Your task

Declare variable text with an initial value of "hello". Use let mut to make it mutable.
Re assign the variable text to something else of your choice.
Return the final value of the variable.

Println! Macro

The println! macro is used to print text to the console. It is similar to the println function in other programming languages. The println! macro is used to print formatted text to the console.

let text = "hello";
println!("Text is {}", text);

The {} is a placeholder that will be replaced by the value of the variable text.

Hints

Use the let mut keyword to declare a mutable variable.
Reassign the variable directly by using the = operator.
Ensure to return the final value of the variable from the function.

Editor not available on Mobile!

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

Solutions

leenalmajz

2 hours ago

3.64ms

92.92kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "bye";
    // 3. Return the value of `text`
    return text
}

Alex Nazarov

aleshkanet

4 hours ago

3.56ms

92.70kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "hello1";
    // 3. Return the value of `text`
    text
}

dpey

4 hours ago

3.35ms

92.80kb

pub fn mutating_variables() -> &'static str {
    
    let mut text = "Hello";
    text = "Buy";
    return text;
}

garanast

4 hours ago

3.91ms

92.70kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    // 2. Reassign the value of `text` to a new value
    // 3. Return the value of `text`
    let mut text = "hello";
    text = "World";
    text
}

maripjan

a day ago

3.59ms

92.94kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
        // 2. Reassign the value of `text` to a new value
    text = "change";
        // 3. Return the value of `text`
    return text
}

Amilcar Rey

amilcarrey

a day ago

3.70ms

92.95kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "lala";
    // 3. Return the value of `text`
    return text;
}

Elizabeth Doughty

Thymelizabeth

a day ago

4.10ms

92.72kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "tēnā koe";
    // 3. Return the value of `text`
    text
}

Sean Benson

SCBenson

a day ago

3.96ms

92.97kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "goodbye";
    // 3. Return the value of `text`
    return text;
}

Jan

jeypiti

a day ago

3.52ms

92.70kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "olleh";
    // 3. Return the value of `text`
    text
}

plasitol

Plasitol

a day ago

6.05ms

92.84kb

pub fn mutating_variables() -> &'static str {
    let mut text = "Hi world!";
    text = "Be world!";
    return text;
}

Tony

YoNoSoyTony

2 days ago

4.53ms

92.72kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "new  value";
    // 3. Return the value of `text`
    text
}

s.konishi

konishu

2 days ago

3.94ms

92.99kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "hello world!";
    // 3. Return the value of `text`
    return text;
}

caad TakaraShinya

TakaraShinya

2 days ago

5.20ms

96.12kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    println!("Text is {}", text);
    // 2. Reassign the value of `text` to a new value
    text = "hogehoge";
    // 3. Return the value of `text`
    println!("Text is {}", text);
    return text;
}

nichideropa

2 days ago

6.67ms

92.70kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "world";
    // 3. Return the value of `text`
    text
}

akshayabhattarai

2 days ago

3.73ms

92.69kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    // 2. Reassign the value of `text` to a new value
    // 3. Return the value of `text`
    let mut text = "hello";
    text = "yo";
    text
}

aleksey-vareto

2 days ago

4.41ms

92.74kb

pub fn mutating_variables() -> &'static str {
    let mut text = "hello";
    text = "something else";
    text
    // 1. Declare a mutable variable `text` with value "hello"
    // 2. Reassign the value of `text` to a new value
    // 3. Return the value of `text`
}

hatchepsut

2 days ago

4.09ms

92.73kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "The new text";
    // 3. Return the value of `text`
    text
}

oDqnger

2 days ago

3.82ms

92.55kb

pub fn mutating_variables() -> &'static str {
    let mut text = "hello";
    text = "world";
    text
}

M4dPac

2 days ago

3.69ms

92.53kb

pub fn mutating_variables() -> &'static str {
    let mut text = "hello";
    text = "";
    text
}

martin-unit

3 days ago

3.90ms

92.70kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "hello2";
    // 3. Return the value of `text`
    text
}

Takuro Niitsuma

otakumesi

3 days ago

3.46ms

92.99kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "hello, world";
    // 3. Return the value of `text`
    return text;
}

matsumura-y1

3 days ago

4.32ms

92.99kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text ="hello";
    // 2. Reassign the value of `text` to a new value
    text = "something else";
    // 3. Return the value of `text`
    return text;
}

kada-s

sy34

3 days ago

3.93ms

92.96kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "world";
    // 3. Return the value of `text`
    return text;
}

matsuyama-k1

3 days ago

3.55ms

92.98kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "hello world";
    // 3. Return the value of `text`
    return text;
}

matsuyama-k1

3 days ago

4.15ms

92.98kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "hello world";
    // 3. Return the value of `text`
    return text;
}

Kohei Matsubara

matsuby

3 days ago

4.50ms

92.81kb

pub fn mutating_variables() -> &'static str {
    let mut text = "hello";
    text = "matsuby";
    return text;
}

Ankeet Parikh

ankeetparikh

3 days ago

3.44ms

92.73kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "something else";
    // 3. Return the value of `text`
    text
}

KuTaKe

kuttakke

3 days ago

3.68ms

92.72kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "hello world";
    // 3. Return the value of `text`
    text
}

aidan1magee

3 days ago

5.03ms

92.70kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "world";
    // 3. Return the value of `text`
    text
}

aidan1magee

3 days ago

4.31ms

92.70kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "world";
    // 3. Return the value of `text`
    text
}

devarajang

3 days ago

4.30ms

92.96kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "world";
    // 3. Return the value of `text`
    return text;
}

maxvi

3 days ago

3.84ms

92.72kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "my choice";
    // 3. Return the value of `text`
    text
}

Aidar Shagiyev

Aidar-Shagiyev

3 days ago

3.98ms

92.68kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "";
    // 3. Return the value of `text`
    text
}

Johan Alexis Duque Cadena

johandroid

3 days ago

4.39ms

92.69kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "NaN";
    // 3. Return the value of `text`
    text
}

chuyuanlinzi

3 days ago

4.26ms

92.72kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    // 2. Reassign the value of `text` to a new value
    // 3. Return the value of `text`
    let mut text = "hello";
    text = "Little Cat";
    text
}

Derteq

3 days ago

3.75ms

92.69kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "dick";
    // 3. Return the value of `text`
    text
}

Rayen Benbetaieb

P0TER19

4 days ago

4.04ms

92.92kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text="salem";
    // 3. Return the value of `text`
    return text
}

0xsmarter

4 days ago

3.80ms

92.72kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    // 2. Reassign the value of `text` to a new value
    // 3. Return the value of `text`
    let mut text = "hello";
    text = "everyone";
    text
}

Walquer Xavier Valles Ruiz

WalquerX

4 days ago

3.91ms

92.72kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "not hello";
    // 3. Return the value of `text`
    text
}

Rafael Lucas

rafaellucasprogm

4 days ago

5.28ms

92.70kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "world";
    // 3. Return the value of `text`
    text
}

koslowskio

4 days ago

4.17ms

92.96kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "something new";
    // 3. Return the value of `text`
    return text
}

Rocky.C

cloki0610

4 days ago

4.74ms

92.73kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "hello world!";
    // 3. Return the value of `text`
    text
}

Denis SOURON

Brack0

4 days ago

4.09ms

92.55kb

pub fn mutating_variables() -> &'static str {
    let mut text = "hello";
    text = "world";
    text
}

Hudson

dalprahcd

4 days ago

3.65ms

92.70kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "world!";
    // 3. Return the value of `text`
    text
}

tsuchiya-d

tsucchinoko

4 days ago

4.49ms

92.70kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "world";
    // 3. Return the value of `text`
    text
}

Samori Gorse

shinuza

5 days ago

4.02ms

92.69kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "foo";
    text
    // 3. Return the value of `text`
}

Prajval Malhotra

prajval-malhotra

5 days ago

3.81ms

92.98kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "new value";
    // 3. Return the value of `text`
    return text;
}

Sabin Howard

whitwulf

5 days ago

4.01ms

92.71kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "not now";
    // 3. Return the value of `text`
    text
}

storiumi

5 days ago

3.37ms

92.96kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    let mut text = "hello";
    // 2. Reassign the value of `text` to a new value
    text = "hoge";
    // 3. Return the value of `text`
    return text;
}

Ugochukwu Paul

ugochukwudev

5 days ago

3.92ms

92.70kb

pub fn mutating_variables() -> &'static str {
    // 1. Declare a mutable variable `text` with value "hello"
    // 2. Reassign the value of `text` to a new value
    // 3. Return the value of `text`
    let mut text = "hello";
    text = "yamaha";
    text
}