Is there a method like JavaScript's substr in Rust?

Question

I looked at the Rust docs for String but I can\'t find a way to extract a substring.

Is there a method like JavaScript\'s substr in Rust? If not, how would you implement

Answer 1

For my_string.substring(start, len)-like syntax, you can write a custom trait:

trait StringUtils {
    fn substring(&self, start: usize, len: usize) -> Self;
}

impl StringUtils for String {
    fn substring(&self, start: usize, len: usize) -> Self {
        self.chars().skip(start).take(len).collect()
    }
}

// Usage:
fn main() {
    let phrase: String = "this is a string".to_string();
    println!("{}", phrase.substring(5, 8)); // prints "is a str"
}