My Rust Solution and test cases!
I felt this one was a little easier than some of the previous days, but nothing wrong with that!
#[derive(Debug, PartialEq)] pub enum Error { InvalidLength, NotSingleDigitInput, } pub fn format_phone_numer(numbers: &[u32]) -> Result<String, Error> { if numbers.len() != 10 { Err(Error::InvalidLength) } else if numbers.iter().any(|x| *x > 9) { Err(Error::NotSingleDigitInput) } else { Ok(format!( "({}{}{}) {}{}{}-{}{}{}{}", numbers[0], numbers[1], numbers[2], numbers[3], numbers[4], numbers[5], numbers[6], numbers[7], numbers[8], numbers[9], )) } } #[cfg(test)] mod tests { use crate::*; #[test] fn it_for_a_valid_phone_number() { assert_eq!( format_phone_numer(&[1, 2, 3, 4, 5, 6, 7, 8, 9, 0]), Ok("(123) 456-7890".to_string()) ); assert_eq!( format_phone_numer(&[3, 2, 1, 5, 5, 5, 3, 1, 6, 3]), Ok("(321) 555-3163".to_string()) ); } #[test] fn it_errors_invalid_length_phone_number() { assert_eq!( format_phone_numer(&[1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 5, 6, 3]), Err(Error::InvalidLength) ); assert_eq!( format_phone_numer(&[1, 2, 3, 4, 5, 6, 7,]), Err(Error::InvalidLength) ); } #[test] fn it_errors_for_non_single_digit_numbers() { assert_eq!( format_phone_numer(&[10, 2, 3, 4, 5, 6, 7, 8, 9, 0]), Err(Error::NotSingleDigitInput) ); } }
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My Rust Solution and test cases!
I felt this one was a little easier than some of the previous days, but nothing wrong with that!