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.

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Solutions

sander-b-postnl

25 minutes ago

2.90ms

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 = "test";
    // 3. Return the value of `text`
    text
}

Abby

abbychau

30 minutes ago

2.83ms

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 = "x";
    // 3. Return the value of `text`
    text 
}

Kai

codecrack3

42 minutes ago

2.82ms

92.96kb

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";
    return text;
}

Nicolay Gerold

nicolaygerold

an hour ago

2.97ms

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 = "chao";
    // 3. Return the value of `text`
    return text
}

Dmytro Hubskyi

Mitrodan

2 hours ago

2.90ms

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 = "chao";
    // 3. Return the value of `text`
    text
}

西北向北

sjava

2 hours ago

3.09ms

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
}

fewo

3 hours ago

2.95ms

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
}

Kevin Wolny

rot11

4 hours ago

2.91ms

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 = "elo";
    // 3. Return the value of `text`
    text
}

Hendrik De Vloed

hendrikdevloed

4 hours ago

2.80ms

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
}

amassare

5 hours ago

2.81ms

92.68kb

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="a";
    text
}

yar999

5 hours ago

2.80ms

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 = "new";
    // 3. Return the value of `text`
    text
}

Marcel Blanck

MarcelBlanck-Philips

5 hours ago

3.11ms

94.46kb

#[allow(unused_assignments)]
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`
    text
}

Matei Stefanescu

matei

6 hours ago

2.90ms

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 = "world";
    // 3. Return the value of `text`
    text
}

Zava

zavakid

6 hours ago

2.95ms

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;
}

Johnchoi913

10 hours ago

2.92ms

93.06kb

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 = "something else of your choice";
    return text;
}

Robsen Gelalcha

RobsenGelalcha

10 hours ago

2.85ms

93.00kb

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 = "cats and dogs";
    return text;
    // 3. Return the value of `text`
    
}

Matthew Davidson

Rational1ty

13 hours ago

2.83ms

92.87kb

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

Parallaxes

14 hours ago

2.75ms

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 = "text";
    // 3. Return the value of `text`
    text
}

Elliott Smith

brum-b0

14 hours ago

2.77ms

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
}

Moses

MosesMp3

16 hours ago

2.92ms

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 = "new";
    // 3. Return the value of `text`
    return text;
}

i5.650

i5-650

19 hours ago

2.73ms

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 = "new hello";
    text
}

Harry Hornbacher

hhornbacher

20 hours ago

2.99ms

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 = "text";
    // 3. Return the value of `text`
    text
}

ogaca42

20 hours ago

2.96ms

92.71kb

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

VladyslavY

21 hours ago

3.18ms

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 = "potato";
    // 3. Return the value of `text`
    return text;
}

Adam Baker

nordicmachine

21 hours ago

2.89ms

92.93kb

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
}

finntonwentworth

a day ago

2.88ms

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 = "un-hello";
    // 3. Return the value of `text`
    return text;
}

Andri McFly

SleepyMorpheus

a day ago

2.84ms

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;
}

Andri McFly

SleepyMorpheus

a day ago

3.17ms

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 = "world";
    // 3. Return the value of `text`
    return text;
}

Ustin

a day ago

2.82ms

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
}

bensmith83

a day ago

3.15ms

96.14kb

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 = "my new value";
    println!("Text is {}", text);
    // 3. Return the value of `text`
    return text;
}

Joseph Brewer

jdbrew2

a day ago

2.96ms

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 = "hey";
    text
}

Joseph Brewer

jdbrew2

a day ago

2.86ms

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 = "hey";
    text
}

Patrik Bjärterot

pbjarterot

a day ago

2.73ms

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 = "hi";
    // 3. Return the value of `text`
    text
}

Malin

malindyr

a day ago

3.39ms

92.55kb

pub fn mutating_variables() -> &'static str {
    let mut text = "hello";
    text = "hello1";  
    text
}

Mifd39

a day ago

3.14ms

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 = "Test";
    // 3. Return the value of `text`
    text
}

Ayush Rawat

ayushrawat10

a day ago

2.85ms

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 = "hi";
    // 3. Return the value of `text`
    text
}

Cédric

AsymetricData

a day ago

2.97ms

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
}

retinotopic

a day ago

2.96ms

92.95kb

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

Smit Barve

l3vith

a day ago

2.76ms

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
}

Stefano Cianciulli

CianciuStyles

a day ago

2.75ms

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
}

atonminion

a day ago

3.11ms

92.93kb

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 = "banana";
    return text
}

damascussteel21

a day ago

2.89ms

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 = "bruh";
    // 3. Return the value of `text`
    text
}

Jonathan Lopez

otherJL0

a day ago

2.87ms

93.11kb

pub fn mutating_variables() -> &'static str {
    let mut text = "10";
    println!("text original value {text}");
    text = "1";
    text
}

jacob kili

solebox

a day ago

2.83ms

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
}

daanbouwman19

a day ago

2.92ms

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
}

Egor Konovalov

agegorin

a day ago

3.01ms

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 = "smth else";
    // 3. Return the value of `text`
    text
}

Oleksandr Romanov

alexromanov

a day ago

2.96ms

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 a text";
    // 3. Return the value of `text`
    text
}

Yunus Abdulmajid

Yunusabdul38

a day ago

2.71ms

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
}

viktr

victorchukwuemeka

a day ago

2.90ms

92.96kb

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 = "good";
    return text;
}

SP. Siddharth

Siddev09

a day ago

2.99ms

92.97kb

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";
    return text;
}