Discussion on: Daily Challenge #44 - Mexican Wave

[NecroTechno]

In Rust, although there is almost certainly a more efficient way of doing this.

fn main() {
    let wave = wave("hello");
    for (_i, a) in wave.into_iter().enumerate() {
        println!("{}", a)
    }
}

fn wave(input: &str) -> Vec<String> {
    let mut result = Vec::new();
    for (i, _c) in input.chars().enumerate() {
        let mut subresult = Vec::new();
        for (ind, cha) in input.chars().enumerate() {
            if i == ind {
                subresult.push(cha.to_uppercase().to_string());
            } else {
                subresult.push(cha.to_lowercase().to_string());
            }
        }
        result.push(subresult.into_iter().collect::<String>());
    }
    return result
}

Playground link here.

[Șerbu Vlad Gabriel]

You can use concatenation to avoid a character by character copy.

...
    for (i, c) in input.chars().enumerate() {
        let upper = c.to_uppercase().to_string();
        let subresult = input[..i].to_string() + &upper + &input[i+upper.len()..];
        result.push(subresult);
    }
...

I don't know the first thing about Rust, so this is probably not optimal either.

Playgrund link here

[NecroTechno]

Nice!