Validate User Input

In many programs, validating user input is a common and crucial task. Ensuring that input data adheres to expected formats and constraints can prevent bugs, enhance security, and improve user experience. In this challenge, you will create a function that validates a user's age and email, returning early if any conditions are not met.

Your task

Your task is to implement a function validate_user(age: i32, email: &str) -> Result<(), String> that validates the user's age and email. The function should follow these rules:

If the age is less than 0 or greater than 120, return an error with the message "Invalid age".
If the email does not contain an '@' symbol, return an error with the message "Invalid email".
If both the age and email are valid, return Ok(()).

Here's an example of how to use the early return technique:

fn early_return(name: &str, age: i32) -> Result<(), String> {
    if name.is_empty() {
        return Err("Name is empty".to_string());
    }
 
    if age < 0 {
        return Err("Invalid age".to_string());
    }
 
    Ok(())
}

Example

let result = validate_user(25, "user@example.com");
assert_eq!(result, Ok(()));
 
let result = validate_user(-1, "user@example.com");
assert_eq!(result, Err("Invalid age".to_string()));
 
let result = validate_user(25, "userexample.com");
assert_eq!(result, Err("Invalid email".to_string()));

Hints

Use the return keyword to exit the function early when an invalid condition is encountered.
Consider using the contains method to check if the email contains an '@' symbol.

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Solutions

sander-b-postnl

3 hours ago

2.27ms

86.72kb

struct Email(());
struct Age(());
impl Email {
    fn parse(email: &str) -> Result<Self, String> {
        match email.contains('@') {
            true => Ok(Self(())), // Usually return the string instead of ().
            false => Err("Invalid email".to_string()),
        }
    }
}
impl Age {
    fn parse(age: i32) -> Result<Self, String> {
        match age {
            0..=120 => Ok(Self(())), // Usually return the i32 instead of ().
            _ => Err("Invalid age".to_string()),
        }
    }
}
pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Use new type pattern to make this more idiomatic to Rust.
    // Usually you store the value, however in this case I chose to let it return
    // a unit struct.
    Age::parse(age)?;
    Email::parse(email)?;
    Ok(())
}

savasozturk

5 hours ago

2.41ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age > 120 || age < 0 {
        return Err("Invalid age".to_string());
    }
    if !email.contains("@") {
        return Err("Invalid email".to_string());
    }
    return Ok(());
}

Zava

zavakid

10 hours ago

2.44ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    } else if !email.contains('@') {
        return Err("Invalid email".to_string());
    } else {
        Ok(())
    }
}

Mikhail

mk-comm

14 hours ago

2.79ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    if age < 1 || age >120 {
        return Err("Invalid age".to_string())
    } else if !email.contains("@") {
        return Err("Invalid email".to_string())
    } else {
        return Ok(())
    };
}

shmaxuti

14 hours ago

2.61ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age < 0 || age > 120 {
        return Err(String::from("Invalid age"));
    }
    if !email.contains('@') {
        return Err(String::from("Invalid email"));
    }
    Ok(())
}

Carlos Arias

carlos-quantexai

18 hours ago

2.33ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    } else if !email.contains('@') {
        return Err("Invalid email".to_string());
    } else {
        Ok(())
    }
}

José Bernardo

jose-bernardo

20 hours ago

2.66ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    if age < 0 || age > 120 { return Err("Invalid age".to_string()); }
    if !email.contains('@') { return Err("Invalid email".to_string()); }
    Ok(())
}

Maxence Potier

Mxn-ptr

21 hours ago

2.38ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    }
    if !email.contains("@") {
        return Err("Invalid email".to_string());
    }
    Ok(())
}

Hin Phansa

hinphansa

a day ago

2.45ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    }
    if !email.contains('@') {
        return Err("Invalid email".to_string());
    }
    Ok(())
}

funny_233

funny233-github

a day ago

2.20ms

86.72kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    if age < 0 || age > 120 {
        return Err(format!("Invalid age"));
    }
    if email.find('@').is_none() {
        return Err(format!("Invalid email"));
    }
    Ok(())
}

Delta Regeer

digitalresistor

2 days ago

2.27ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age > 120 || age < 0 {
        return Err("Invalid age".to_string());
    }
    if !email.contains("@") {
        return Err("Invalid email".to_string());
    }
    Ok(())
}

majesticalcreature

2 days ago

2.24ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    if age < 0 || age > 120 {
        return Err(String::from("Invalid age"));
    }
    if !email.contains("@") {
        return Err(String::from("Invalid email"));
    }
    Ok(())
}

今何求

jhq223

2 days ago

2.21ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    }
    if !email.contains("@") {
        return Err("Invalid email".to_string());
    }
    Ok(())
}

Will Barnett

xbarnett

2 days ago

2.36ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age < 0 || age > 120 {
        return Err(String::from("Invalid age"));
    }
    if !email.contains('@') {
        return Err(String::from("Invalid email"));
    }
    Ok(())
}

Gareth Andrew Lloyd

Ignition

3 days ago

2.20ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    }
    if !email.contains('@') {
        return Err("Invalid email".to_string());
    }
 
    Ok(())
}

Matei Stefanescu

matei

3 days ago

2.34ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    }
    if !email.contains("@") {
        return Err("Invalid email".to_string());
    }
    return Ok(());
}

Ojash Neopane

oneopane

3 days ago

2.39ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string())
    }
    if !email.contains("@") {
        return Err("Invalid email".to_string())
    }
    Ok(())
}

Stefano Cianciulli

CianciuStyles

3 days ago

2.33ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    }
    if !email.contains('@') {
        return Err("Invalid email".to_string());
    }
    Ok(())
}

Patrik Bjärterot

pbjarterot

3 days ago

2.29ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    }
    if !email.contains("@") {
        return Err("Invalid email".to_string());
    }
    return Ok(())
}

Joel Vicente Filho

kyhou

3 days ago

2.31ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if !(0..120).contains(&age) {
        return Err("Invalid age".to_string());
    }
    if !email.contains('@') {
        return Err("Invalid email".to_string());
    }
    Ok(())
}

Ayush Rawat

ayushrawat10

4 days ago

2.29ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    }
    if !email.contains("@") {
        return Err("Invalid email".to_string());
    }
    Ok(())
}

Adi

Aditeya

4 days ago

2.32ms

86.72kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    if age < 0 || age > 120 {
        return Err("Invalid age".into());
    }
    if !email.contains("@") {
        return Err("Invalid email".into());
    }
    Ok(())
}

masteryachty

4 days ago

2.40ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    }
     if email.is_empty() || !email.contains("@") {
        return Err("Invalid email".to_string());
    }
 
    Ok(())
}

Igor Morozov

morigs

4 days ago

2.31ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    }
    if !email.contains("@") {
        return Err("Invalid email".to_string());
    }
    Ok(())
}

damascussteel21

4 days ago

2.37ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    if age < 0 || age > 120 {
        Err(String::from("Invalid age"))
    }
    else if !email.chars().any(|c| c == '@') {
        Err(String::from("Invalid email"))
    }
    else {
        Ok(())
    }
}

Edgar Christian

edgarcnp

4 days ago

2.27ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    }
    if !email.contains('@') {
        return Err("Invalid email".to_string());
    }
    Ok(())
}

John Truong

jtruong04

4 days ago

2.38ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    }
    if !email.contains('@') {
        return Err("Invalid email".to_string());
    }
    Ok(())
}

Jason Green

jaswgreen

5 days ago

2.21ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    }
 
    if !email.contains("@") {
        return Err("Invalid email".to_string());
    }
 
    Ok(())
}

CarrotTarrot

5 days ago

2.21ms

86.72kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age < 0 || age > 120 {
        return Err("Invalid age".into())
    }
    if !email.contains("@") { 
        return Err("Invalid email".into())
    }
    Ok(())
}

Samuel

Sommos

5 days ago

2.18ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    if age < 0 || age > 120 {
        return Err(String::from("Invalid age"));
    }
    if !email.contains("@") {
        return Err(String::from("Invalid email"));
    }
    Ok(())
}

Dimitris Lygkonis

xyres137

5 days ago

2.20ms

81.43kb


pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    
    if age < 0 || age > 120 {
        return Err(String::from("Invalid age"));
    }
    if !&email.contains("@") {
        return Err(String::from("Invalid email"));
    }
    Ok(())
}

Tukan van der Borgh

tukantje

5 days ago

2.63ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age > 120 || age < 0 {
        return Err("Invalid age".to_string());
    }
    if !email.contains('@') {
        return Err("Invalid email".to_string());
    }
    Ok(())
}

Christian Franzl

wischi-chr

5 days ago

2.22ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    }
    if !email.contains('@') {
        return Err("Invalid email".to_string());
    }
    Ok(())
}

Nicolás Caracci

hilias

5 days ago

2.26ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    if age < 0 || age > 120 {
        Err("Invalid age".to_string())
    } else if !email.chars().any(|c| c == '@') {
        Err("Invalid email".to_string())
    } else {
        Ok(())
    }
}

Quentin Cabanes

qcabanes-hobby

6 days ago

2.25ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    }
    if !email.contains("@") {
        return Err("Invalid email".to_string());
    }
    Ok(())
}

TaiPoole

6 days ago

2.39ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string())
    }
    if !email.chars().any(|x| x == '@') {
        return Err("Invalid email".to_string())
    }
    Ok(())
}

TomBaston

6 days ago

2.32ms

86.72kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age < 0 || age > 120 {
        return Err("Invalid age".into());
    }
    if !email.contains('@') {
        return Err("Invalid email".into());
    }
    Ok(())
}

swandyr

6 days ago

2.16ms

86.72kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    if age < 0 || age > 120 {
        return Err("Invalid age".into());
    }
    if !email.contains("@") {
        return Err("Invalid email".into());
    }
    Ok(())
}

Nithin S Varrier

0x006E

6 days ago

2.18ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    }
    if !email.contains("@") {
        return Err("Invalid email".to_string());
    } 
    Ok(())
}

Vineel Kovvuri

vineelkovvuri

6 days ago

2.26ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    }
    if !email.contains("@") {
        return Err("Invalid email".to_string());
    }
    Ok(())
}

Andrei

Andrey2ec

7 days ago

2.21ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
        match (age,email.contains("@")) {
       (age, _) if age < 0 || age > 120 => Err("Invalid age".to_string()),
       (_, false) => Err("Invalid email".to_string()),
        _ => Ok(()) 
    }
    }

Elhanan Buchsbaum

elhananby

7 days ago

2.23ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if !(0..=120).contains(&age) {
        return Err("Invalid age".to_string());
    }
    if !email.contains("@") {
        return Err("Invalid email".to_string());
    }
    // if name.is_empty() {
    //     return Err("Name is empty".to_string());
    // }
    Ok(())
}

2daysagokid

7 days ago

2.29ms

81.43kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    match (age,email.contains("@")) {
       (age, _) if age < 0 || age > 120 => Err("Invalid age".to_string()),
       (_, false) => Err("Invalid email".to_string()),
        _ => Ok(()) 
    }
}

Dante Kelly

dantekelly

9 days ago

2.20ms

86.74kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    match age {
        _ if age < 0 || age > 120 => Err("Invalid age".to_string()),
        _ if !email.contains("@") => Err("Invalid email".to_string()),
        _ => Ok(())
    }
}

Johann-Philipp Thiers

philippthiers

10 days ago

2.24ms

86.74kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    }
    if !email.to_string().contains("@") {
        return Err("Invalid email".to_string());
    }
    Ok(())
}

Saravut Nakglom

SRVng

10 days ago

2.25ms

86.74kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    if age.le(&0) || age.gt(&120) {
        return Err("Invalid age".to_string())
    }
    if !email.contains("@") {
        return Err("Invalid email".to_string())
    }
    Ok(())
}

Dante Kelly

dantekelly

10 days ago

2.49ms

86.74kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    match (age, email) {
        _ if age < 0 || age > 120 => Err("Invalid age".to_string()),
        _ if !email.contains("@") => Err("Invalid email".to_string()),
        _ => Ok(())
    }
}

Manav Hirani

manavhirani

12 days ago

2.33ms

86.74kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    if age < 0 || age > 120 {
        Err("Invalid age".to_string())
    } else if !email.contains("@") {
        Err("Invalid email".to_string())
    } else {
        Ok(())
    }
}

Jenny

jenny07007

12 days ago

2.44ms

86.74kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    match age {
        0..=120 => {},
        _ => return Err("Invalid age".to_string()),
    }
    match email.contains('@') {
        true => {},
        false => return Err("Invalid email".to_string()),
    }
    Ok(())
}

denbailey

12 days ago

2.48ms

86.74kb

pub fn validate_user(age: i32, email: &str) -> Result<(), String> {
    // Implement here
    if email.is_empty(){
        return  Err("Email is Empty".to_string());
    }
    if age < 0 || age > 120 {
        return Err("Invalid age".to_string());
    }
    if email.contains('@') == false {
        return Err("Invalid email".to_string());
    }
    Ok(())
}