Hello,

As I said in the previous post that I have started learning Rust and made a simple fibonacci series generator. Today I made a palindrome string checker. it’s very basic. I haven’t used Enum or Struct in the code since I don’t think it’s necessary in this simple code.

here is the code:

use std::io;

fn main() {
    let mut input = String::new();
    let stdin = io::stdin();
    stdin.read_line(&mut input).unwrap(); // we want to exit in case it couldn't read from stdin

    input = input.replace("\n", ""); // Removing newline

    let mut is_palindrome: bool = true;
    for i in 0..input.len()/2 {
        let first_char: &str = &input[i..i+1];
        let last_char: &str = &input[input.len()-i-1..input.len()-i];
        if first_char != "\n" {
            if first_char != last_char {
                is_palindrome = false;
            }
        }
    }

    println!("palindrome: {}", is_palindrome);
}
  • FizzyOrange@programming.dev
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    1 day ago

    You only need to check half of the string, so I think a technically optimal solution would have some take_while and maybe char_indices in there…

    • Flipper
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      1 day ago

      That’s exactly what I Hinted at in my post, though I would use take(input.size()/2). However I wouldn’t be surprised if the compiler could short circuit it, but I haven’t checked.

      • FizzyOrange@programming.dev
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        1 day ago

        Oh yeah I can’t read 😄

        I would be extremely surprised if any compiler was smart enough to short circuit that.

        I would be a little less surprised if checking the whole string was actually faster anyway though… but I would still bet against it.