String
String is the standard heap-allocated growable UTF-8 string buffer:
fn main() {
let mut s1 = String::new();
s1.push_str("Hello");
println!("s1: len = {}, capacity = {}", s1.len(), s1.capacity());
let mut s2 = String::with_capacity(s1.len() + 1);
s2.push_str(&s1);
s2.push('!');
println!("s2: len = {}, capacity = {}", s2.len(), s2.capacity());
let s3 = String::from("🇨🇭");
println!("s3: len = {}, number of chars = {}", s3.len(),
s3.chars().count());
}
String
implements Derefstr
methods on a String
.
len()
returns the size of theString
in bytes, not its length in characters.chars()
returns an iterator over the actual characters.