rustvla | Rust practice challenges

Beta

Sometimes you run operations that might fail, and you don't care about the specific error details. You just want to know whether the operation succeeded or failed. Rust’s Result<T, E> can be converted into an Option<T> to represent success (Some) or failure (None), discarding the error details.

This challenge builds on the concept of handling Result and converting it to Option. You will write a function that reads the entire content of a file and returns it as an Option<String>.

Your Task

Implement the function read_file:

It takes a file path (&str) as input.
Attempts to open the file and read its entire content as a String.
If the operation is successful, return Some(String) containing the file content.
If any error occurs (e.g., file not found, permission issues, etc.), return None.
Use the .ok() method to convert Result into Option and use the ? operator to easily propagate errors if required.

← PreviousNext →

pub fn read_file(file_path: &str) -> Option<String> {
    // TODO: Implement this function
    // Hint: Use `File::open` and `.read_to_string()` with `?` to propagate errors.
}

// Example usage
pub fn main() {
    let file_path = "example.txt";

    match read_file(file_path) {
        Some(contents) => println!("File contents:\n{}", contents),
        None => println!("Failed to read the file."),
    }
}

pub fn read_file(file_path: &str) -> Option<String> {
    // TODO: Implement this function
    // Hint: Use `File::open` and `.read_to_string()` with `?` to propagate errors.
}

// Example usage
pub fn main() {
    let file_path = "example.txt";

    match read_file(file_path) {
        Some(contents) => println!("File contents:\n{}", contents),
        None => println!("Failed to read the file."),
    }
}