Idiomatic Rust लिखना

// Entry point: execution of the program starts here
fn main() {
    // Declare an immutable variable `numbers`, set to `vec![1, 2, 3, 4, 5]`
    let numbers = vec![1, 2, 3, 4, 5];
    // Declare an immutable variable `sum_of_squares` (an integer), set to `numbers.iter().map(|n| n * n).sum()`
    let sum_of_squares: i32 = numbers.iter().map(|n| n * n).sum();
    // Print "{}" to the console, substituting in `sum_of_squares` (with a trailing newline)
    println!("{}", sum_of_squares);
}

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// Define the function `print_length` taking `s`
fn print_length(s: &str) {
    // Print "Length: {}" to the console, substituting in `s.len()` (with a trailing newline)
    println!("Length: {}", s.len());
}

// Entry point: execution of the program starts here
fn main() {
    // Declare an immutable variable `text`, set to `String::from("idiomatic")`
    let text = String::from("idiomatic");
    print_length(&text);
    // Print "Still usable: {}" to the console, substituting in `text` (with a trailing newline)
    println!("Still usable: {}", text);
}

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// Define an enum `PaymentStatus` listing its possible variants
enum PaymentStatus {
    Pending,
    Completed(f64),
    Failed(String),
}

// Define the function `describe` taking `status` and returning a String
fn describe(status: PaymentStatus) -> String {
    // Match on `status` and branch by pattern
    match status {
        PaymentStatus::Pending => String::from("still pending"),
        PaymentStatus::Completed(amount) => format!("completed for ${}", amount),
        PaymentStatus::Failed(reason) => format!("failed: {}", reason),
    }
}

// Entry point: execution of the program starts here
fn main() {
    // Print "{}" to the console, substituting in `describe(PaymentStatus::Completed(49.99))` (with a trailing newline)
    println!("{}", describe(PaymentStatus::Completed(49.99)));
}

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fn main() {
    let value = 100; // no mut needed since it is never reassigned
    println!("Clean, warning-free code: {}", value);
}

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