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

You can also use .to_string()[ ].

This example takes an immutable slice of the original string, then mutates that string to demonstrate the original slice is preserved.

let mut s: String = "Hello, world!".to_string();

let substring: &str = &s.to_string()[..6];

s.replace_range(..6, "Goodbye,");

println!("{}   {} universe!", s, substring);

//    Goodbye, world!   Hello, universe!